Wang W., Makeev A., Povorov S. Experimental investigation on performances of plate heat exchanger’s cold side for lubrication/water - water heat transfer
The document experimentally investigates the thermal-hydraulic performance of a plate heat exchanger's cold side for lubrication/water-water heat transfer. Tests were conducted with hot lubrication/water at 72°C and varying cold water velocities from 12°C. Results show that the convective heat transfer coefficient increases with the Reynolds number. The Fanning friction factor decreases with increasing Reynolds number. For Peclet numbers below 2500, increasing the Peclet number leads to an increased Nusselt number. The study provides heat transfer characteristics of the plate heat exchanger's cold side for lubrication/water-water.
This document describes 7 fluid mechanics laboratory equipment, including their components, technical descriptions, and applications. The equipment measure phenomena like Bernoulli's principle, pressure losses, jet velocity, laminar and turbulent flow visualization, pipe friction losses, pipe networks, and particle drag coefficients. Objectives of the experiments include demonstrating fluid dynamics concepts and measuring flow properties.
This document provides diagrams and descriptions of 8 pieces of equipment in the Fluid Mechanics Laboratory at the University of Gujrat's Department of Chemical Engineering. The equipment is used to demonstrate various fluid mechanics principles and phenomena, including Bernoulli's principle, losses in bends and fittings, orifice and jet velocity, Osborn Reynolds demonstration, pipe friction, pipe networks, hydrostatic pressure, and particle drag coefficients. For each apparatus, the main components are listed, with a brief 1 sentence description provided for some of the equipment.
The two-phase flow through vertical transparent pipe is investigated
experimentally. The experimental rig designed to achieve the measurements of
pressure drop for various combinations of phases, flow pattern regimes such as
bubbly, slug and annular, with various range of water and air volumetric high speed
camera . The air volumetric ranged from 8.3334 L/min to 25 l/min, while the water
volumetric ranged from 5 l/min to 20 l/min and of 50 mm internal diameter along 1 m
length. The measured of the pressure will be done using four pressure sensors along
test pipe. The measured pressure values were used for different air volumetric and
different water volumetric. It has been found that the measuring of pressure gradient
through the distance of rig pipe are inversely changed with air volumetric. In
addition, it has been analyzed the flow pattern through obstruction, it has showed one
phase flow, bubbly and slug flow.
Factors effecting vertical lift performanceJALEEL AHMED
This document discusses factors that affect vertical lift performance (VLP) in oil and gas wells. It explains that VLP is determined by calculating pressure losses versus production rate. The main factors that influence VLP are choke size, gas-liquid ratio, and tubing diameter. Changing the choke opening affects wellhead pressure and shifts the VLP curve. Increasing the gas-liquid ratio can initially improve VLP up to a point, by reducing density. Larger tubing diameters also initially increase flow rates and VLP, but beyond a critical size, pressure losses from friction and acceleration dominate.
This document summarizes an experimental study of heat transfer in a plate heat exchanger. Experiments were conducted using a three channel plate heat exchanger with hot fluid (milk or water) flowing in the central channel and cold water in the outer channels. Temperature and fluid properties were measured for parallel and counter flow arrangements. The average heat transfer coefficient was found to be 17% higher for the milk-water system compared to the water-water system in counter flow arrangement. Tables of experimental data and results including temperatures, properties, heat transfer coefficients, Nusselt numbers, and effectiveness are presented.
The document discusses well deliverability and pressure drop in oil and gas wells. It explains that pressure drop is affected by properties of the reservoir fluids, production rates, and the mechanical configuration of the wellbore. Pressure loss is highest in the tubing and can be estimated using charts, correlations, or equations that consider fluid properties, flow rates, and well geometry. Matching inflow and outflow pressures gives the stabilized flow rate. The document compares methods for estimating pressure drop in single-phase and multiphase flow.
Vortex Tube Usage in Cooling and Liquification Process of Excess Gases in Ghe...Samet Baykul
DATE: 2019.05
- Computational analysis of a vortex tube
- Developing boundary conditions for heat transfer analysis
- CAD by creating a suitable model for heat transfer analysis
- CFD analysis by using ANSYS FLUENT
- Literature survey for recent academic studies
ABSTRACT:
Vortex tubes are simple and common devices which separates a high-pressure gas flow as two different lower gas flows. One of the outlets has a higher temperature than the inlet high pressure gas and other outlet has lower. Most common types of the vortex tubes are counter and parallel flow types. In counter flow type vortex tubes the cold and hot outlets are on opposite sides and in parallel flow type both the outlets are on the same side. Since it is a simple, well known, compact, portable, highly reliable and has a few initial costs, it could be desirable for the specific heating or cooling and refrigeration applications.
The document describes experiments conducted to calibrate flow rates, analyze heat transfer coefficients, and measure heat loss in a heat exchange system. Key findings include:
1) Calibration curves were developed to correlate pneumatic valve pressure to flow rates for different operation modes.
2) Heat transfer coefficients for process and cooling water were consistent with theoretical models based on Reynolds number.
3) Fouling was observed in the cooling water heat exchanger, indicated by higher heat transfer coefficients compared to the process water exchanger.
4) Total heat loss from the system was approximately 4 kW, representing around 10% of the total heat transferred from steam.
This document describes 7 fluid mechanics laboratory equipment, including their components, technical descriptions, and applications. The equipment measure phenomena like Bernoulli's principle, pressure losses, jet velocity, laminar and turbulent flow visualization, pipe friction losses, pipe networks, and particle drag coefficients. Objectives of the experiments include demonstrating fluid dynamics concepts and measuring flow properties.
This document provides diagrams and descriptions of 8 pieces of equipment in the Fluid Mechanics Laboratory at the University of Gujrat's Department of Chemical Engineering. The equipment is used to demonstrate various fluid mechanics principles and phenomena, including Bernoulli's principle, losses in bends and fittings, orifice and jet velocity, Osborn Reynolds demonstration, pipe friction, pipe networks, hydrostatic pressure, and particle drag coefficients. For each apparatus, the main components are listed, with a brief 1 sentence description provided for some of the equipment.
The two-phase flow through vertical transparent pipe is investigated
experimentally. The experimental rig designed to achieve the measurements of
pressure drop for various combinations of phases, flow pattern regimes such as
bubbly, slug and annular, with various range of water and air volumetric high speed
camera . The air volumetric ranged from 8.3334 L/min to 25 l/min, while the water
volumetric ranged from 5 l/min to 20 l/min and of 50 mm internal diameter along 1 m
length. The measured of the pressure will be done using four pressure sensors along
test pipe. The measured pressure values were used for different air volumetric and
different water volumetric. It has been found that the measuring of pressure gradient
through the distance of rig pipe are inversely changed with air volumetric. In
addition, it has been analyzed the flow pattern through obstruction, it has showed one
phase flow, bubbly and slug flow.
Factors effecting vertical lift performanceJALEEL AHMED
This document discusses factors that affect vertical lift performance (VLP) in oil and gas wells. It explains that VLP is determined by calculating pressure losses versus production rate. The main factors that influence VLP are choke size, gas-liquid ratio, and tubing diameter. Changing the choke opening affects wellhead pressure and shifts the VLP curve. Increasing the gas-liquid ratio can initially improve VLP up to a point, by reducing density. Larger tubing diameters also initially increase flow rates and VLP, but beyond a critical size, pressure losses from friction and acceleration dominate.
This document summarizes an experimental study of heat transfer in a plate heat exchanger. Experiments were conducted using a three channel plate heat exchanger with hot fluid (milk or water) flowing in the central channel and cold water in the outer channels. Temperature and fluid properties were measured for parallel and counter flow arrangements. The average heat transfer coefficient was found to be 17% higher for the milk-water system compared to the water-water system in counter flow arrangement. Tables of experimental data and results including temperatures, properties, heat transfer coefficients, Nusselt numbers, and effectiveness are presented.
The document discusses well deliverability and pressure drop in oil and gas wells. It explains that pressure drop is affected by properties of the reservoir fluids, production rates, and the mechanical configuration of the wellbore. Pressure loss is highest in the tubing and can be estimated using charts, correlations, or equations that consider fluid properties, flow rates, and well geometry. Matching inflow and outflow pressures gives the stabilized flow rate. The document compares methods for estimating pressure drop in single-phase and multiphase flow.
Vortex Tube Usage in Cooling and Liquification Process of Excess Gases in Ghe...Samet Baykul
DATE: 2019.05
- Computational analysis of a vortex tube
- Developing boundary conditions for heat transfer analysis
- CAD by creating a suitable model for heat transfer analysis
- CFD analysis by using ANSYS FLUENT
- Literature survey for recent academic studies
ABSTRACT:
Vortex tubes are simple and common devices which separates a high-pressure gas flow as two different lower gas flows. One of the outlets has a higher temperature than the inlet high pressure gas and other outlet has lower. Most common types of the vortex tubes are counter and parallel flow types. In counter flow type vortex tubes the cold and hot outlets are on opposite sides and in parallel flow type both the outlets are on the same side. Since it is a simple, well known, compact, portable, highly reliable and has a few initial costs, it could be desirable for the specific heating or cooling and refrigeration applications.
The document describes experiments conducted to calibrate flow rates, analyze heat transfer coefficients, and measure heat loss in a heat exchange system. Key findings include:
1) Calibration curves were developed to correlate pneumatic valve pressure to flow rates for different operation modes.
2) Heat transfer coefficients for process and cooling water were consistent with theoretical models based on Reynolds number.
3) Fouling was observed in the cooling water heat exchanger, indicated by higher heat transfer coefficients compared to the process water exchanger.
4) Total heat loss from the system was approximately 4 kW, representing around 10% of the total heat transferred from steam.
CFD Simulation and Heat Transfer Analysis of Automobile Radiator using Helica...IJERD Editor
To ensure smooth running of an automotive vehicle under any variable load conditions, one of the major systems necessary is the cooling system. Automobile radiators are becoming highly power-packed with increasing power to weight or volume ratio. Computational Fluid Dynamics (CFD) is one of the important software tools to access preliminary design and the performance of the radiator. In this paper, a 55 hp engine radiator data is taken for analysis in CFD. The model is done Pro-E software and imported in ANSYS-12. Helical tubes are considered for the radiator with two different pitches like 15mm & 20mm. The comparison is done for different mass flow rates like 2.3, 2.0, 1.0, 0.5 kg/sec in helical type tubes. It is found that there is more heat dissipation rate in 15mm pitch helical tubes compared to 20mm pitch helical tubes. Maximum temperature drop & minimum pressure drop occurs in case of 0.5 kg/sec of mass flow rate. It is observed that with increased mass flow rate, there is decrease in temperature drop & increase in pressure drop
The document summarizes the fabrication and testing of a heat exchanger test rig. Key points:
- The test rig was designed and built to study a counter-flow tube heat exchanger using aluminum sheets and tubes.
- Finite element analysis was performed on the rig design to analyze stresses. Water was heated to 40°C and pumped through one side while tap water entered the other side.
- Effectiveness-NTU method was used to calculate theoretical outlet temperatures which were compared to experimental readings to determine error percentages.
Experimental Investigation on Heat Transfer Analysis in a Cross flow Heat Ex...IJMER
Heat exchanger is devices used to exchange the heat between two liquids that are at different
temperature .These are used as a reheated in many industries and auto mobile sector and power
plants. The main aim of our project is thermal analysis of heat exchanger with waved baffles for
different types of materials at different mass flow rates and different tube diameters using FLOEFD
software and comparing the results that are obtained. The work is a simplified model for the study of
thermal analysis of shell-and-tubes heat exchangers having water as cold and hot fluid. Shell and
Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre-heaters.
They are also widely used in process applications as well as the refrigeration and air conditioning
industry. The robustness and medium weighted shape of Shell and Tube heat exchangers make them
well suited for high pressure operations. The project shows the best material, best boundary conditions
and parameters of materials we have to use for better heat conduction. For this we are chosen a
practical problem of counter flow shell and tube heat exchanger having water, by using the data that
come from cfd analysis. A design of sample model of shell and tube heat exchanger with waved baffles
is using Pro-e and done the thermal analysis by using FLOEFD software by assigning different
materials to tubes with different diameters having different mass flow rates and comparing the result
that obtained from FLOEFD software.
Overview of artificial lift technology and introduction to esp systemGiuseppe Moricca
This document outlines the agenda for a 5-day course on electric submersible pump systems. Day 1 provides an overview of artificial lift technology and introduction to ESP systems. Days 2-3 cover ESP basic design, operational factors, system components and their operational features. Day 4 addresses ESP system design through a step-by-step procedure. Day 5 focuses on ESP installation, monitoring, optimization, troubleshooting and diagnostics. The document also includes detailed schedules and learning objectives for each day of the course.
Experimental investigation of performance of plate heat exchanger for water a...eSAT Journals
Abstract
Compact heat exchangers are most widely used for heat transfer applications in industries. Plate heat exchanger is one such compact heat exchanger, provides more area for heat transfer between two fluids in comparison with shell and tube heat exchanger. Plate type heat exchangers are widely used for liquid-to-liquid heat transfer applications with high density working fluids. This study is focused on use of plate type heat exchanger for water as a working fluid. This research work deals with experimental investigation of plate type heat exchanger with evaluation of convective heat transfer coefficient, overall heat transfer coefficient, exchanger effectiveness. The heat exchanger used for carrying out this work consists of thin metal welded plates of stainless steel with 1mm thickness, rectangular geometry and distance between two plates is 7mm. This test setup consists of total 16 numbers of plates and it is designed to withstand with 850C temperature, pressure drop is neglected. Tests are conducted by varying operating parameters like mass flow rate, inlet temperatures of hot water. The main objective of this work is to find effects of these parameters on performance of plate heat exchanger with parallel flow arrangement. Results show that, overall heat transfer coefficient and convective heat transfer coefficient increases with increase in mass flow rate and Reynolds number. Also the effectiveness varies slightly with heat capacity ratio. In this study, maximum effectiveness achieved for plate heat exchanger with water as a working fluid is 0.48.Use of plate heat exchanger is more advantageous than the tube type heat exchanger with same effectiveness, as it occupies less space.
Keywords: Plate heat exchanger, Convective heat transfer coefficient, Effectiveness, Overall heat transfer coefficient, Reynolds number.
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
THE EFFECT OF GEOMETRICAL PARAMETERS ON HEAT TRANSFER AND HYDRO DYNAMICAL CHA...ijmech
Compact size and high heat transfer coefficient of helical coil heat exchangers causes them to have an
important role in various industrial applications. This paper investigate numerically on the influence of
different parameters such as coil radius, coil pitch and diameter of tube on the hydrodynamic and
heat transfer characteristics of helical double tube heat exchangers using the CFD software which is
based on the principles of heat transfer, fluid mechanics and thermodynamics. The results indicated that
heat transfer augmentation occurs by increasing of the inner Dean Number, inner tube diameter, curvature
ratio and by the reduction of the pitch of heat exchanger coil. By increasing the radius of coils, the
secondary flow effects due to centrifugal forces diminishes and flow of fluid through the coils tends to flow
in a straight path and as a result, the friction coefficient decreases consequently.
Nodal Analysis introduction to inflow and outflow performance - nextgusgon
This document discusses nodal analysis concepts for analyzing inflow and outflow performance in fluid systems. It introduces key terms like nodal analysis, inflow, outflow, upstream and downstream components, and graphical solutions. It provides an example problem calculating system capacity and the impact of changing pipe diameters. It also covers topics like single-phase and multiphase fluid flow, flow regimes, flow patterns, and calculating pressure drops and flow performance in pipes.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow). The results show that overall heat transfer coefficients increase with increasing inner Dean number and mass flow rates. Heat transfer rates also increase with higher inner mass flow rates. Counter flow configuration provides better heat transfer than parallel flow. Increasing the inner tube size decreases the total heat transfer rate due to a reduction in annulus cross-sectional area. Measured inner Nusselt numbers agree reasonably well with existing correlations.
The document provides information on production optimization through system analysis using nodal analysis. It discusses key components of the production system including reservoir fluid properties, inflow performance, tubing performance, and how to analyze the combined system. The objectives are to understand inflow, vertical lift, and combined performance. Nodal analysis is introduced as a technique to simulate fluid flow by breaking the system into nodes and ensuring pressure continuity. An example application optimizes a well's production rate by analyzing effects of tubing size, wellhead pressure, water cut, and skin on the combined inflow and outflow curves. The optimized design achieves a production rate of 114 MMscf/d with a 6.18" tubing and 2,000 psi
Simulation of the flue gas flow through the superheatHuy Nguyen
This document summarizes a study that uses computational fluid dynamics (CFD) to model the flow of flue gas through the superheater section of a recovery boiler. The study finds that the flue gas flow pattern is not optimal for heat transfer, with recirculation zones occurring. It models the superheaters as porous zones to simulate pressure drop. The models show recirculation at the lower superheater portions and channeled flow at the top. An abrupt inlet profile leads to a more uniform flow than a rounded profile. Improving the inlet design could enhance heat transfer and steam temperature.
This document summarizes a research paper that analyzed heat transfer in an economizer using computational fluid dynamics (CFD). It discussed how fins can be added to economizer tubes to increase the heat transfer surface area between flue gases and boiler feedwater. The document reviewed previous research on economizer design optimization and failures. It described the working of CFD analysis using equations of continuity, momentum, and energy to model fluid flow. The study used the k-ε turbulence model in CFD software to analyze heat transfer with and without fins on an economizer.
HEAT TRANSFER CORRELATION FOR NON-BOILING STRATIFIED FLOW PATTERN | J4RV3I11006Journal For Research
In chemical industries two phase flow is a process necessity. A better understanding of the rates of momentum and heat transfer in multi-phase flow conditions is important for the optimal design of the heat exchanger. To simplify the complexities in design, heat transfer coefficient correlations are useful. In this work a heat transfer correlation for non- boiling air-water flow with stratified flow pattern in horizontal circular pipe is proposed. To verify the correlation, heat transfer coefficients and flow parameters were measured at different combinations of air and water flow rates. The superficial Reynolds numbers ranged from about 2720 to 5740 for water and from about 563 to 1120 for air. These experimental data were successfully correlated by the proposed two-phase heat transfer correlation. It is observed that superficial.
This document provides an overview of reservoir engineering concepts for predicting vertical oil well performance, including productivity index, inflow performance relationship, and methods for modeling these relationships. It discusses key topics like:
- Defining and measuring productivity index using stabilized well test data
- How productivity index, inflow performance relationship, and well flow rates relate under pseudosteady state conditions
- Factors influencing productivity index like fluid properties and relative permeability
- Empirical methods like Vogel's method for generating inflow performance curves over the life of depleting reservoirs
The document is from a course on reservoir engineering concepts for vertical wells, with the goal of teaching practical equations to model well performance and factors governing fluid flow.
The document describes an experimental and numerical study to enhance heat transfer on a heat exchanger using an air flow with water droplets and Al2O3/water nanofluid. The study used a test rig with an instrumented air duct to inject water droplets via nozzles toward a finned tube heat exchanger. Experiments tested different nozzle types, droplet locations, air/water flow rates and temperatures. Numerical analysis using ANSYS FLUENT modeled the governing equations to study parameter effects. Results showed maximum heat transfer enhancement of 45% occurred at a 2% nanofluid concentration with sprayed air, agreeing within 11% of experimental data.
This document outlines the procedures and results from an experiment on gas absorption using an absorption column. The experiment examined the air pressure drop across the column as air flow rate was increased for different fixed water flow rates. Pressure drop was recorded and plotted against air flow rate. The experimental flooding points where compared to theoretical calculations, with errors ranging from 11.1% to 20%. The results showed that pressure drop increased with air flow rate as expected, identifying the flooding points where liquid could no longer flow down the column.
IRJET- Thermal and Fluid Flow Analysis of a Heat Exchanger: “A Comprehensive ...IRJET Journal
This document provides a comprehensive literature review and analysis of thermal and fluid flow performance in heat exchangers. It discusses several types of heat exchangers and techniques used to enhance heat transfer, such as surface textures, channel designs, and nanofluids. The document reviews experimental, numerical, and computational studies on fluid flow characteristics and heat transfer for different heat exchanger configurations and applications. It also provides governing equations for fluid flow and heat transfer analysis and compares experimental results to analytical predictions using correlations.
A REVIEW PAPER ON ANALYSIS OF AUTOMOBILE RADIATORijsrd.com
An Automotive engine cooling system takes out of excess heat produced during engine operation. An automobile cooling system regulates engine surface temperature for engine optimum efficiency. Recent advancement and development in engine for power forced engine cooling system to develop new strategies to improve its performance efficiency. Also to reduce fuel consumption along with controlling engine emission to mitigate environmental pollution norms. This paper throws light on parameters which influence radiator performance along with reviews some of the conventional and modern approaches to enhance radiator performance. This review paper Focus on the various research papers regarding experimental, CFD and Numerical analysis to improving automobile radiator efficiency.
This document presents a methodology to measure flow rates in multiple zone water injection wells using fluid temperature profiles. It describes using the Ramey model to relate fluid temperature to flow rates in each zone through an exponential function. The Ramey model is then linearized to allow for uncertainty analysis of the calculated flow rates. An experimental fluid temperature profile from a dual zone water injection well was used to validate the methodology, with calculated flow rates showing good agreement with measured values and uncertainties of 1-10%.
AN EXPERIMENTAL STUDY OF EXERGY IN A CORRUGATED PLATE HEAT EXCHANGERIAEME Publication
In the present work an attempt has been made to investigate the performance of a 3 channel 1-1 pass, corrugated plate heat exchanger. The plates had sinusoidal wavy surfaces with corrugation angle of 450. Hot water at different inlet temperature ranging from 400C to 600C was made to flow in the central channel to get cooled by water in the outer channels.
IRJET- Heat Transfer Studies of Corrugated Plate Heat Exchanger using OilIRJET Journal
This document presents a study on heat transfer in corrugated plate heat exchangers using oil as the heat transfer fluid. Three corrugated plate heat exchangers with angles of 30°, 40°, and 50° were experimentally tested and compared to a flat plate heat exchanger. The heat transfer coefficient and Nusselt number increased with increasing Reynolds number and corrugation angle. The 50° corrugation angle achieved the highest heat transfer rates, representing a 40% increase over the 30° angle. Using oil as the fluid resulted in slightly higher heat transfer compared to previous studies using water. The experimental results agreed with previous CFD analyses showing improved performance of corrugated plates over flat plates.
CFD Simulation and Heat Transfer Analysis of Automobile Radiator using Helica...IJERD Editor
To ensure smooth running of an automotive vehicle under any variable load conditions, one of the major systems necessary is the cooling system. Automobile radiators are becoming highly power-packed with increasing power to weight or volume ratio. Computational Fluid Dynamics (CFD) is one of the important software tools to access preliminary design and the performance of the radiator. In this paper, a 55 hp engine radiator data is taken for analysis in CFD. The model is done Pro-E software and imported in ANSYS-12. Helical tubes are considered for the radiator with two different pitches like 15mm & 20mm. The comparison is done for different mass flow rates like 2.3, 2.0, 1.0, 0.5 kg/sec in helical type tubes. It is found that there is more heat dissipation rate in 15mm pitch helical tubes compared to 20mm pitch helical tubes. Maximum temperature drop & minimum pressure drop occurs in case of 0.5 kg/sec of mass flow rate. It is observed that with increased mass flow rate, there is decrease in temperature drop & increase in pressure drop
The document summarizes the fabrication and testing of a heat exchanger test rig. Key points:
- The test rig was designed and built to study a counter-flow tube heat exchanger using aluminum sheets and tubes.
- Finite element analysis was performed on the rig design to analyze stresses. Water was heated to 40°C and pumped through one side while tap water entered the other side.
- Effectiveness-NTU method was used to calculate theoretical outlet temperatures which were compared to experimental readings to determine error percentages.
Experimental Investigation on Heat Transfer Analysis in a Cross flow Heat Ex...IJMER
Heat exchanger is devices used to exchange the heat between two liquids that are at different
temperature .These are used as a reheated in many industries and auto mobile sector and power
plants. The main aim of our project is thermal analysis of heat exchanger with waved baffles for
different types of materials at different mass flow rates and different tube diameters using FLOEFD
software and comparing the results that are obtained. The work is a simplified model for the study of
thermal analysis of shell-and-tubes heat exchangers having water as cold and hot fluid. Shell and
Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre-heaters.
They are also widely used in process applications as well as the refrigeration and air conditioning
industry. The robustness and medium weighted shape of Shell and Tube heat exchangers make them
well suited for high pressure operations. The project shows the best material, best boundary conditions
and parameters of materials we have to use for better heat conduction. For this we are chosen a
practical problem of counter flow shell and tube heat exchanger having water, by using the data that
come from cfd analysis. A design of sample model of shell and tube heat exchanger with waved baffles
is using Pro-e and done the thermal analysis by using FLOEFD software by assigning different
materials to tubes with different diameters having different mass flow rates and comparing the result
that obtained from FLOEFD software.
Overview of artificial lift technology and introduction to esp systemGiuseppe Moricca
This document outlines the agenda for a 5-day course on electric submersible pump systems. Day 1 provides an overview of artificial lift technology and introduction to ESP systems. Days 2-3 cover ESP basic design, operational factors, system components and their operational features. Day 4 addresses ESP system design through a step-by-step procedure. Day 5 focuses on ESP installation, monitoring, optimization, troubleshooting and diagnostics. The document also includes detailed schedules and learning objectives for each day of the course.
Experimental investigation of performance of plate heat exchanger for water a...eSAT Journals
Abstract
Compact heat exchangers are most widely used for heat transfer applications in industries. Plate heat exchanger is one such compact heat exchanger, provides more area for heat transfer between two fluids in comparison with shell and tube heat exchanger. Plate type heat exchangers are widely used for liquid-to-liquid heat transfer applications with high density working fluids. This study is focused on use of plate type heat exchanger for water as a working fluid. This research work deals with experimental investigation of plate type heat exchanger with evaluation of convective heat transfer coefficient, overall heat transfer coefficient, exchanger effectiveness. The heat exchanger used for carrying out this work consists of thin metal welded plates of stainless steel with 1mm thickness, rectangular geometry and distance between two plates is 7mm. This test setup consists of total 16 numbers of plates and it is designed to withstand with 850C temperature, pressure drop is neglected. Tests are conducted by varying operating parameters like mass flow rate, inlet temperatures of hot water. The main objective of this work is to find effects of these parameters on performance of plate heat exchanger with parallel flow arrangement. Results show that, overall heat transfer coefficient and convective heat transfer coefficient increases with increase in mass flow rate and Reynolds number. Also the effectiveness varies slightly with heat capacity ratio. In this study, maximum effectiveness achieved for plate heat exchanger with water as a working fluid is 0.48.Use of plate heat exchanger is more advantageous than the tube type heat exchanger with same effectiveness, as it occupies less space.
Keywords: Plate heat exchanger, Convective heat transfer coefficient, Effectiveness, Overall heat transfer coefficient, Reynolds number.
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
THE EFFECT OF GEOMETRICAL PARAMETERS ON HEAT TRANSFER AND HYDRO DYNAMICAL CHA...ijmech
Compact size and high heat transfer coefficient of helical coil heat exchangers causes them to have an
important role in various industrial applications. This paper investigate numerically on the influence of
different parameters such as coil radius, coil pitch and diameter of tube on the hydrodynamic and
heat transfer characteristics of helical double tube heat exchangers using the CFD software which is
based on the principles of heat transfer, fluid mechanics and thermodynamics. The results indicated that
heat transfer augmentation occurs by increasing of the inner Dean Number, inner tube diameter, curvature
ratio and by the reduction of the pitch of heat exchanger coil. By increasing the radius of coils, the
secondary flow effects due to centrifugal forces diminishes and flow of fluid through the coils tends to flow
in a straight path and as a result, the friction coefficient decreases consequently.
Nodal Analysis introduction to inflow and outflow performance - nextgusgon
This document discusses nodal analysis concepts for analyzing inflow and outflow performance in fluid systems. It introduces key terms like nodal analysis, inflow, outflow, upstream and downstream components, and graphical solutions. It provides an example problem calculating system capacity and the impact of changing pipe diameters. It also covers topics like single-phase and multiphase fluid flow, flow regimes, flow patterns, and calculating pressure drops and flow performance in pipes.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow). The results show that overall heat transfer coefficients increase with increasing inner Dean number and mass flow rates. Heat transfer rates also increase with higher inner mass flow rates. Counter flow configuration provides better heat transfer than parallel flow. Increasing the inner tube size decreases the total heat transfer rate due to a reduction in annulus cross-sectional area. Measured inner Nusselt numbers agree reasonably well with existing correlations.
The document provides information on production optimization through system analysis using nodal analysis. It discusses key components of the production system including reservoir fluid properties, inflow performance, tubing performance, and how to analyze the combined system. The objectives are to understand inflow, vertical lift, and combined performance. Nodal analysis is introduced as a technique to simulate fluid flow by breaking the system into nodes and ensuring pressure continuity. An example application optimizes a well's production rate by analyzing effects of tubing size, wellhead pressure, water cut, and skin on the combined inflow and outflow curves. The optimized design achieves a production rate of 114 MMscf/d with a 6.18" tubing and 2,000 psi
Simulation of the flue gas flow through the superheatHuy Nguyen
This document summarizes a study that uses computational fluid dynamics (CFD) to model the flow of flue gas through the superheater section of a recovery boiler. The study finds that the flue gas flow pattern is not optimal for heat transfer, with recirculation zones occurring. It models the superheaters as porous zones to simulate pressure drop. The models show recirculation at the lower superheater portions and channeled flow at the top. An abrupt inlet profile leads to a more uniform flow than a rounded profile. Improving the inlet design could enhance heat transfer and steam temperature.
This document summarizes a research paper that analyzed heat transfer in an economizer using computational fluid dynamics (CFD). It discussed how fins can be added to economizer tubes to increase the heat transfer surface area between flue gases and boiler feedwater. The document reviewed previous research on economizer design optimization and failures. It described the working of CFD analysis using equations of continuity, momentum, and energy to model fluid flow. The study used the k-ε turbulence model in CFD software to analyze heat transfer with and without fins on an economizer.
HEAT TRANSFER CORRELATION FOR NON-BOILING STRATIFIED FLOW PATTERN | J4RV3I11006Journal For Research
In chemical industries two phase flow is a process necessity. A better understanding of the rates of momentum and heat transfer in multi-phase flow conditions is important for the optimal design of the heat exchanger. To simplify the complexities in design, heat transfer coefficient correlations are useful. In this work a heat transfer correlation for non- boiling air-water flow with stratified flow pattern in horizontal circular pipe is proposed. To verify the correlation, heat transfer coefficients and flow parameters were measured at different combinations of air and water flow rates. The superficial Reynolds numbers ranged from about 2720 to 5740 for water and from about 563 to 1120 for air. These experimental data were successfully correlated by the proposed two-phase heat transfer correlation. It is observed that superficial.
This document provides an overview of reservoir engineering concepts for predicting vertical oil well performance, including productivity index, inflow performance relationship, and methods for modeling these relationships. It discusses key topics like:
- Defining and measuring productivity index using stabilized well test data
- How productivity index, inflow performance relationship, and well flow rates relate under pseudosteady state conditions
- Factors influencing productivity index like fluid properties and relative permeability
- Empirical methods like Vogel's method for generating inflow performance curves over the life of depleting reservoirs
The document is from a course on reservoir engineering concepts for vertical wells, with the goal of teaching practical equations to model well performance and factors governing fluid flow.
The document describes an experimental and numerical study to enhance heat transfer on a heat exchanger using an air flow with water droplets and Al2O3/water nanofluid. The study used a test rig with an instrumented air duct to inject water droplets via nozzles toward a finned tube heat exchanger. Experiments tested different nozzle types, droplet locations, air/water flow rates and temperatures. Numerical analysis using ANSYS FLUENT modeled the governing equations to study parameter effects. Results showed maximum heat transfer enhancement of 45% occurred at a 2% nanofluid concentration with sprayed air, agreeing within 11% of experimental data.
This document outlines the procedures and results from an experiment on gas absorption using an absorption column. The experiment examined the air pressure drop across the column as air flow rate was increased for different fixed water flow rates. Pressure drop was recorded and plotted against air flow rate. The experimental flooding points where compared to theoretical calculations, with errors ranging from 11.1% to 20%. The results showed that pressure drop increased with air flow rate as expected, identifying the flooding points where liquid could no longer flow down the column.
IRJET- Thermal and Fluid Flow Analysis of a Heat Exchanger: “A Comprehensive ...IRJET Journal
This document provides a comprehensive literature review and analysis of thermal and fluid flow performance in heat exchangers. It discusses several types of heat exchangers and techniques used to enhance heat transfer, such as surface textures, channel designs, and nanofluids. The document reviews experimental, numerical, and computational studies on fluid flow characteristics and heat transfer for different heat exchanger configurations and applications. It also provides governing equations for fluid flow and heat transfer analysis and compares experimental results to analytical predictions using correlations.
A REVIEW PAPER ON ANALYSIS OF AUTOMOBILE RADIATORijsrd.com
An Automotive engine cooling system takes out of excess heat produced during engine operation. An automobile cooling system regulates engine surface temperature for engine optimum efficiency. Recent advancement and development in engine for power forced engine cooling system to develop new strategies to improve its performance efficiency. Also to reduce fuel consumption along with controlling engine emission to mitigate environmental pollution norms. This paper throws light on parameters which influence radiator performance along with reviews some of the conventional and modern approaches to enhance radiator performance. This review paper Focus on the various research papers regarding experimental, CFD and Numerical analysis to improving automobile radiator efficiency.
This document presents a methodology to measure flow rates in multiple zone water injection wells using fluid temperature profiles. It describes using the Ramey model to relate fluid temperature to flow rates in each zone through an exponential function. The Ramey model is then linearized to allow for uncertainty analysis of the calculated flow rates. An experimental fluid temperature profile from a dual zone water injection well was used to validate the methodology, with calculated flow rates showing good agreement with measured values and uncertainties of 1-10%.
Similar to Wang W., Makeev A., Povorov S. Experimental investigation on performances of plate heat exchanger’s cold side for lubrication/water - water heat transfer
AN EXPERIMENTAL STUDY OF EXERGY IN A CORRUGATED PLATE HEAT EXCHANGERIAEME Publication
In the present work an attempt has been made to investigate the performance of a 3 channel 1-1 pass, corrugated plate heat exchanger. The plates had sinusoidal wavy surfaces with corrugation angle of 450. Hot water at different inlet temperature ranging from 400C to 600C was made to flow in the central channel to get cooled by water in the outer channels.
IRJET- Heat Transfer Studies of Corrugated Plate Heat Exchanger using OilIRJET Journal
This document presents a study on heat transfer in corrugated plate heat exchangers using oil as the heat transfer fluid. Three corrugated plate heat exchangers with angles of 30°, 40°, and 50° were experimentally tested and compared to a flat plate heat exchanger. The heat transfer coefficient and Nusselt number increased with increasing Reynolds number and corrugation angle. The 50° corrugation angle achieved the highest heat transfer rates, representing a 40% increase over the 30° angle. Using oil as the fluid resulted in slightly higher heat transfer compared to previous studies using water. The experimental results agreed with previous CFD analyses showing improved performance of corrugated plates over flat plates.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Study on Air-Water & Water-Water Heat Exchange in a Finned Tube ExchangerAnamika Sarkar
Heat exchange characteristics between hot and cold water as well as cold air and hot water have been investigated in a finned tube heat exchanger. The exchanger was operated in both parallel and counter-flow modes. For water-water heat exchange, the tube side (hot water) fluid flow rate was varied to observe the effects on heating the cold water. Conversely, for air-water system, the shell side (cold air) flow rate was varied to evaluate the cooling effectiveness of air in the finned tube exchanger. COMSOL Multiphysics 5.6 was used to simulate the system in 3-D mode, and the temperature profiles along with heat flux and velocity streamlines were evaluated. The NTU and effectiveness for varying fluid flow rates for both water-water and air-water systems were calculated. NTU values were considerably higher for air-water heat exchange and showed a decreasing trend with increasing fluid flow rate. To ascertain the reliability of the simulation models, the experimental and simulated results were compared. To evaluate the performance of the fins, the fin efficiencies and effectivenesses were calculated and the values were notably higher in case of air-water system. This is consistent with established literature. Also, increasing shell-side fluid flow rate led to a reduction in fin efficiency and effectiveness, which is again consistent with literature.
Performance prediction of a thermal system using Artificial Neural NetworksIJERD Editor
This document summarizes a study on using artificial neural networks (ANNs) to predict the performance of a condenser system and assess fouling over time. Experiments were conducted on an industrial condenser to collect temperature and flow rate data. An ANN model was developed and trained to predict the overall heat transfer coefficient of the clean condenser system based on the input parameters. The model was then used to calculate the fouling factor by comparing the predicted clean performance to the actual performance measured over time, indicating degradation due to fouling on the heat transfer surfaces. The developed system provides a method to monitor condenser performance and identify when cleaning is needed to improve efficiency.
Experimental Investigation of Brazed Plate Heat Exchanger for Small Temperatu...IRJET Journal
1) The document presents an experimental investigation of a brazed plate heat exchanger (BPHE) for applications requiring a small temperature difference between hot and cold fluids.
2) The experiment varies the flow rate of hot water from 2 liters/minute to 6 liters/minute while keeping the inlet temperature and flow rate of cold water constant.
3) The results show that increasing the flow rate of hot water increases the heat transfer, due to increased turbulence from the corrugated plate design at higher velocities.
IRJET- Uncertainty Analysis of Flat Plate Oscillating Heat Pipe with Differen...IRJET Journal
The document discusses the thermal performance of a flat plate oscillating heat pipe (OHP) using different working fluids. It presents the following key points:
1. An experimental setup was used to test the OHP with working fluids like water, ethanol, methanol, and acetone. Thermal resistance was calculated at varying heat input levels.
2. Acetone showed the lowest thermal resistance and best thermal performance compared to the other fluids. Thermal resistance decreased with increasing heat input for all fluids.
3. Uncertainty analysis was performed on the heating power and thermal resistance measurements. For a sample acetone test, the uncertainties were calculated to be 5.17% for heating power and 1.5%
CFD Analysis of Plate Fin Tube Heat Exchanger for Various Fin InclinationsIJERA Editor
ANSYS Fluent software is used for three dimensional CFD simulations to investigate heat transfer and fluid flow characteristics of six different fin angles with plain fin tube heat exchangers. The numerical simulation of the fin tube heat exchanger was performed by using a three dimensional numerical computation technique. Geometry of model is created and meshed by using ANSYS Workbench software. To solve the equation for the fluid flow and heat transfer analysis ANSYS FLUENT was used in the fin-tube heat exchanger. The fluid flow and heat transfer are simulated and result compared for both laminar and turbulent flow models k-epsilon and SST k-omega, with steady state solvers to calculate heat transfer, flow velocity and temperature fields of variable inclined fin angles (Ɵ = 00,100 , 200, 300, 400,500). Model is validate by comparing the simulated value of velocity, temperature and colburn factor with experimental and numerical results investigated by WANG [1] and GHORI KIRAR [10]. Reasonable agreement is found between the simulations and other results, and the ANSYS Fluent software is sufficient for simulating the flow fields in tube fin heat exchanger.
This document analyzes the performance of different ocean thermal energy conversion cycles, including single-stage Rankine, double-stage Rankine, and Kalina cycles. It finds that double-stage Rankine and Kalina cycles, which use multiple heat exchangers or working fluid mixtures, can improve power output over a single-stage Rankine cycle by reducing irreversible losses during heat exchange. The analysis applies a simple method to evaluate temperature differences between working fluids and seawater in order to compare the system characteristics and effectiveness of reducing these losses across cycle types.
IRJET- Experimental Investigation of Pipe in Pipe Tube Heat Exchanger using S...IRJET Journal
This document presents an experimental investigation of a pipe-in-pipe tube heat exchanger using silica (SiO2) nanofluid. The heat exchanger consists of an outer steel pipe and inner aluminum pipe. SiO2 nanofluid with 2% volume concentration and 100nm nanoparticle size is used and compared to water as the base fluid. Test results show that the nanofluid improves heat transfer characteristics and heat transfer coefficient compared to water. Specifically, the effectiveness of the heat exchanger increased by 23.1% when using nanofluid versus water. Varying the mass flow rate was also found to impact the heat transfer rate and effectiveness.
Investigation of a Double Tube Heat Exchanger with DimplesIRJET Journal
The document investigates the experimental performance of a double tube heat exchanger with an inner dimpled tube. Tests were conducted with the inner tube containing elliptic dimples at varying angles of 45° and 60°, as well as a plain tube for comparison. Parameters like effectiveness, number of transfer units, and Nusselt number were found to be 87%, 107.8%, and 53% higher respectively for the dimpled tube compared to the plain tube. The heat exchanger with 60° dimple angle performed best among the configurations. Dimples enhanced heat transfer by inducing secondary flows and disrupting boundary layers. This study analyzed the heat transfer and pressure drop characteristics with variations in Reynolds number, dimple angle, and
This document describes the development of a numerical model to simulate heat transfer and fluid dynamics in a helical double-pipe vertical condenser. The condenser is part of an absorption heat transformer system integrated with a water purification process. Experimental data from the condenser is used to validate the model. The model considers heat transfer via conduction in the tube walls and the phase change that occurs inside the inner tube. Governing equations for continuity, momentum and energy are discretized and solved using an implicit method. The model is evaluated dynamically to determine how operating variables like mass flow rate affect heat flux, pressure and temperature in the condenser. This helps optimize control of the overall system.
Effect of Wavy (Corrugated) Twisted Tape Inserts on Heat Transfer in a double...ijiert bestjournal
This document summarizes an experimental study on heat transfer in a double pipe heat exchanger with the use of wavy twisted tape inserts in the inner tube. Various wavy twisted tapes with different twist ratios were inserted into the inner copper tube to enhance turbulence and heat transfer. Temperature and pressure measurements were taken at varying flow rates and Reynolds numbers. The results showed that heat transfer, as measured by Nusselt number, increased with decreasing twist ratio of the insert. The wavy twisted tape with a twist ratio of 7.1 produced the highest 172% increase in Nusselt number but also the highest 32.11% increase in friction factor compared to the smooth tube. Correlations were developed for Nusselt number
Comparative Study of ECONOMISER Using the CFD Analysis IJMER
This paper presents a simulation of the economizer zone, which allowsstudying the flow
patterns developed in the fluid, while it flows along the length of the economizer. The past failure
details revelsthat erosion is more in U-bend areas of Economizer Unit because of increase in flue gas
velocity near these bends. But it isobserved that the velocity of flue gases surprisingly increases near
the lower bends as compared to upper ones. The model issolved using conventional CFD techniques by
FLUENT software. In which the individual tubes are treated as sub-gridfeatures. A geometrical model
is used to describe the multiplicity of heat-exchanging structures and the interconnectionsamong them.
The Computational Fluid Dynamics (CFD) approach is utilised for the creation of a three-dimensional
modelof the economizer coil of single column tube. With equilibrium assumption applied for
description of the system chemistry. The flue gastemperature, pressure and velocity field of fluid flow
within an economizer tube using the actual bounda
Experimental Analysis on Thermosyphon Heatpipe to Find Heat Transfer CoefficentIRJET Journal
This document describes an experimental analysis conducted to determine the heat transfer coefficient of a thermosyphon heat pipe. The experiment used a copper thermosyphon heat pipe 570mm long with de-ionized water as the working fluid. Tests were run at heat inputs of 155W, 200W, 250W and 300W, fluid flow rates of 10, 15, and 20 ml/sec, and inclinations of 30 and 45 degrees. Temperature readings at the evaporator and condenser ends were recorded and used to calculate parameters like thermal efficiency, heat flux, thermal resistance, and heat transfer coefficient. Graphs of the results show that a 45 degree inclination produced higher efficiency and heat transfer compared to 30 degrees.
Heat transfer and pressure drop characteristics of Air- liquid heat exchangerIRJET Journal
This document presents an experimental study on the heat transfer and pressure drop characteristics of an air-liquid heat exchanger using an ethylene glycol/water mixture as the coolant. The results showed that adding ethylene glycol to water increases the heat transfer coefficient and that the heat transfer coefficient further increases with higher coolant temperature and mass flow rate. Pressure drop also increases from adding ethylene glycol and with air velocity. The study aims to evaluate using ethylene glycol/water mixtures as enhanced heat transfer coolants in heat exchangers.
IRJET- Thermal Analysis of Corrugated Plate Heat Exchanger by using Ansys...IRJET Journal
This document discusses thermal analysis of a corrugated plate heat exchanger using ANSYS software through finite element analysis. It summarizes previous research on using nanofluids like Al2O3 in water to improve heat transfer in these types of heat exchangers. The document then outlines the methodology that will be used, which involves studying the corrugated plate heat exchanger with counterflow configuration and varying parameters like volume flow rate and corrugation angle to determine the optimal heat transfer results.
This document summarizes an experimental study on enhancing heat transfer in a corrugated plate heat exchanger by adding aluminum oxide (Al2O3) microparticles to water. The study used a 3-channel heat exchanger with sinusoidal corrugated plates at a 45 degree angle. Hot water was flowed through the central channel while water with varying concentrations of Al2O3 microparticles was flowed through the outer channels. Tested parameters included hot water inlet temperature from 40-70°C, Al2O3 volume concentration from 0-1.275%, and parallel vs counter flow configurations. Results showed adding Al2O3 microparticles increased heat exchanger effectiveness substantially, with counter flow seeing up to 0.96 effectiveness
IRJET- Design the Shell and Tube Heat Exchanger with the Help of Programming ...IRJET Journal
This document discusses the design of a shell and tube heat exchanger using MATLAB software. It begins with an abstract that outlines how heat exchangers transfer heat between fluids and research into increasing heat exchanger effectiveness. It then provides background on heat exchangers and discusses prior research on improving shell and tube heat exchanger design, notably methods developed by Kern, Tinker, Bell, Saunders, Taborek, Wills and Johnston, and others. The document indicates that while hand calculations were used historically, computer programs are now widely employed for heat exchanger design.
SUMMARYThis report represents the outcome of heat exchang.docxpicklesvalery
SUMMARY:
This report represents the outcome of heat exchange via 4 tubes that are fitted within the shell with four thermocouples to determine the temperature for every pass, two passes for the hot water (in/out) and two for the cold water (in/out). The experiment was commencing according to the amount of hot and cold water that was supplied to the inputs of the heat exchange. The supply was managed by the use of taps that would restrain or allow the gush of water. The temperature for the inputs was constant in the most of the 5 runs while the outputs had been changed due to heat exchange occurring within the shell. Hot water had lost temperature while cold water had gained temperature.
An experiment was set up to resolve the energy losses that affect the hot and cold water, by using thermodynamic laws. During the experiment the water gush rates were measured carefully and the data had been collected and entered to allow the calculations of the energy losses that came out. Finally, it was discovered the heat had been exchanged from the hot into the cold to maintain the temperature inside the shell.
Contents:
SUMMARY:i
1.0INTRODUCTION:1
2.0AIM:1
3.0EXPERIMENTAL METHOD:1
4.0EXPERIMENTAL DATA:2
5.0DATA ANALYSIS:2
6.0DISCUSSION:4
7.0CONCLUSION4
ii
INTRODUCTION:
The exchanger consists of a number of tubes that sit inside a shell that allows cold water to flow through them. Hot water flow through the bordering shell and the two fluids exchange heat. Heat exchanger can come in various forms and as such can have many different motives. A radiator in a car and a boiler in a steam engine are both heat exchanger with the radiator cooling the engine, and the boiler exchanging raw materials into steam that can be used for power generation. The heat exchanger that has been used in this experiment was a basic shell and tube style as shown in figure 1. A Jenco digital thermometer and Jenco thermocouple switches are used in the heat exchanger set up to allow to calculate the measurements for the experiment. Flow meters fitted on the inlet of hot and cold water taps are used to change volume flow rates.
AIM:
The aim of the report is to evaluate the heat losses that came out for the hot water. The experiment will carry of recording temperatures and flow rates and then calculating other possible factors that may cause heat loss.EXPERIMENTAL METHOD:
1) Be familiar with the different part of the experimental.
2) Turn on the cold and hot water taps.
3) Turn valves for the cold water at an initial flow rate (approximate 15 L/min for cold water) Make sure that all the water passes through the flow meters (turn off one of the valves in each water supply line)
4) Water for couple of minutes before reading the data.
5) Take the temperature reading for the thermocouples 1 to 5 by press the Jenco thermocouple buttons.
6) Repeat steps from 3) to 5) for 5 different flow rate combinations.EXPERIMENTAL DATA:
Room temperature: 15°C
Run/Quantities
(L/min)
(L/min)
in ...
Similar to Wang W., Makeev A., Povorov S. Experimental investigation on performances of plate heat exchanger’s cold side for lubrication/water - water heat transfer (20)
Wang W., Makeev A. Passive methods analysis of heat transfer intensification ...Елена Овечкина
The article analyzes the methods of passive intensification of heat exchange processes. The dependence of hydraulic resistance for fluid flow through the heat exchanger on the value of the temperature head on it is considered. The most effective ways of improvement of heat exchange processes are defined.
Tresnitskii S., Filatova A., Avdeenko V. Efficiency of parenteral application...Елена Овечкина
Mastitis is the most common disease in dairy farming, in clinical and subclinical form it is diagnosed in more than 50% of cows. Currently, various drugs and methods are used to treat mastitis. The article presents data on the effectiveness of the use of the preparation Ceftonit and preparation on the basis of cefquinome sulfate in the treatment of various forms of clinical mastitis during lactation.
For the treatment of mastitis, the cows used the preparation Ceftonit®, Nita–Farm Russia, containing in its composition 50 mg/ml of Ceftiofur, which is used in comparison with imported drug containing in its composition 25 mg/ml Cefquinome sulfate.
As a result of researches, it is established that the drug Ceftonit in the treatment of clinical mastitis in cows is not found in the milk of BRT by the AIM test and shows 100% therapeutic efficacy with an average recovery time of animals 5.5 days. Disease recurrence in the form of subclinical mastitis in the treatment with the drug Ceftonit was from 25 to 33%, and in the treatment with the drug based on cefkinom sulfate the number of relapses was greater and amounted to 44.44%.
The use of the drug Ceftonit® for the treatment of mastitis does not lead to the culling of milk due to the presence of antibiotics, in contrast to the drug based on Cefquinome sulfate, which has a restriction on milk, as confirmed by our studies.
Topuria R., Sharabidze I., Markelia B. Some specifications of diesel engine r...Елена Овечкина
The paper dwells on the effectiveness the transition of diesel transport–energy equipment to the alternative gaseous fuel, as well as its specific design features. There is justified the possibility of the ignition of a gaseous fuel mixture through the assessment of dosing of the explosive charge, and its influence on the functioning of the process of a gas–air mixture combustion.
There are also described the possible positive phenomena, which have sprung during the operation on gaseous fuel.
Kalistratova L., Kireev A. Ordering and density amorphous phase of carbon-fib...Елена Овечкина
We studied the application of a mathematical model for calculating the X-ray density of a pure amorphous–crystalline polymer, taking into account the degree of ordering, crystallinity and deformation of a crystalline cell in the amorphous phase, to carbon–fiber PTFE–composites. By comparing the theoretical densities (based on the developed software) of PTFE + CF composites system with the results of experimental densities and X-ray structural parameters, it was shown that the degree of ordering and density of the amorphous phase of the polymer–matrix PTFE–composites linearly decrease as the content of the carbon–fiber increases. The change in the degree of ordering of the amorphous phase when filler application can be considered as one of the mechanisms of formation of the supramolecular structure of composite materials on the basis of amorphous–crystalline polymers.
Shvaiba D. Structural stability and socio-economic security of the hierarchic...Елена Овечкина
The financial and economic macro–system mixes different hierarchical structures: functional, sectoral, territorial. Its hierarchical structure has the ability to be different from the hierarchical structure of the organization — the micro level segment. Socioeconomic security of the highest value of the hierarchy is an array of criteria and points that ensure the freedom of the country’s economy, its strength and stability, the capacity for constant renewal and self–improvement. Socioeconomic security of any country is an important high–quality feature of the financial and economic system of the state, which determines its ability to maintain the normal circumstances of life of the population, to ensure the provision of resources for the establishment of the economy, and, in addition, to ensure the national and state interests. Social and economic security guarantees stable financial and economic growth, sufficient provision of social needs, effective management, protection of financial and economic interests at the state and global levels. Socioeconomic security of the lowest value of the hierarchy (enterprise) — a provision of its security from the adverse effects of external and internal hazards, destabilizing moments, which guarantees the stable implementation of financial and economic interests and goals of the work.
Shvaiba D. Socio-economic security of the hierarchical system Елена Овечкина
The paradox of financial and economic reality lies in the fact that it coexists and phenomena of financial evolution, and processes of conventional (non-transient) type. On the one hand, the economy is changing technologies, goods, organizations and structures. In this sense, it is evolutionary. On the other hand, the acts of these shifts do not exhaust the essence of financial and economic functioning. The huge role is played by the moments of economic strength of financial entities, coordination of costs and results, demand and supply, anti–crisis formation. The study of these moments is the prerogative of classical science. This means that science as a whole is not able to refute the classical approaches and absolutize fresh, non-traditional views (synergetic, evolutionary) on the concept or Vice versa. The synthesis of classical and fresh non-standard financial and economic doctrines is necessary.
Pyatin V., Volobuev A., Romanchuk N., Shchukin Yu., Bulgakova S., Nikitin O. ...Елена Овечкина
It was found that Alzheimer’s disease and senile dementia are the result of the same cause — a violation of the neuronal structure of the brain, most often in the final period of human life. The difference is only in the depth and nature of violations.
Combined methods of control “cognitive brain”, neurorehabilitation, IT-technologies and automatic analysis of the whole genome sequencing improve the quality of medical care.
Mustafayeva, G. (2018). Aphelinids (Hymenoptera: Aphelinidae) - parasites of ...Елена Овечкина
For the first time, the species composition of aphelinids (Hymenoptera, Aphelinidae) — parasites of scales and armoured scales of Azerbaijan is given. As a result of long-term research for the fauna of Azerbaijan, 41 species of aphelinids, derived from scales and armoured scales have been identified. Of the revealed aphelinids, 10 species are new for the fauna of Azerbaijan, 1 species for the fauna of the South Caucasus, one recently described species is endemic to Azerbaijan.
Tsandekova, O. (2018). Features of sulfur accumulation in needles Pinus sylve...Елена Овечкина
The article analyzes the results of the content of total and exogenous sulfur in the needles of Pinus sylvestris, growing in conditions of the Kedrovsky coal mine. Some changes in metabolic processes were revealed, which were expressed in the accumulation of sulfur dioxide.
In pine needles, an increase in this indicator was observed on average by 18-32% relative to control.
The level of accumulation of exogenous sulfur in the samples under study did not exceed the background values. Experimental data can be used in assessing the state of the woody plants' inanthropogenic environment.
Khramchankova, V., & Novikau, R. Extraction efficiency analysis of usnic acid...Елена Овечкина
The extraction efficiency of usnic acid by acetone, ethanol and benzene from lichens Evernia prunastri, Ramalina pollinaria and Cladonia arbuscula was investigated. The methods of cold maceration of biomass with the appropriate solvent and extraction in the Soxhlet apparatus — directly and with preliminary cold maceration of the biomass with hexane were used.
The extraction efficiency of usnic acid from the biomass Everniaprunastri and Ramalina pollinaria was greatest when using the method of cold maceration with hexane for 7 days, followed by extraction with ethanol in the Soxhlet apparatus — up to 0,43% and 1,81% of the air-dry mass of the lichen, respectively. From Cladonia arbuscula biomass, usnic acid was most efficiently recovered by the method of cold maceration with acetone — up to 2,54% of the air-dry mass of the lichen.
Ordering and density amorphous phase of polymer-matrix PTFE-composite materia...Елена Овечкина
Discusses the impact of dispersed filler in the form of microcrystalline graphite (MG) on the formation of the supramolecular structure of the amorphous–crystalline polymeric materials the binary system of PTFE + MG. The theoretically calculated and experimental values of the composites densities are compared. The theoretical model of densities calculation takes into account the degree of crystallinity and the degree of the polymer–matrix (PM) ordering, as well as the deformation of the crystal cell in the amorphous phase. The degree of ordering and density of PM PTFE–composites amorphous phase behave in a complex manner with increasing content of dispersed filler and in a different way than with fibrous filler in the form of carbon fiber (CF). Studies of dual systems of PTFE + MG and PTFE + CF have shown that the ordering presence the amorphous phase can be considered one of the formation factors of the composite materials supramolecular structure based on amorphous–crystalline polymers.
398 страниц текста, 57 статей по разным научным направлениям, 92 автора из 6 стран, 28 городов.
Квалификационный состав авторов: 18 докторов наук, 36 кандидатов наук, 5 аспирантов.
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БЮЛЛЕТЕНЬ НАУКИ И ПРАКТИКИ (BULLETIN OF SCIENCE AND PRACTICE) № 7Елена Овечкина
ABOUT JOURNAL
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В журнале рассматриваются вопросы развития мировой и региональной науки и практики. Для ученых, преподавателей, аспирантов, студентов.
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Editor–in–chief — PhD E. S. Ovechkina
Editorial Board:
Nitsenko V., Dr. habil., Mechnikov Odessa national University (Ukraine, Odessa)
Ibragimova L., Dr. habil., Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Sokolov S., Dr. habil., Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Urazaeva L., PhD, Surgut state pedagogical University (Russia, Surgut)
Soldatova S., PhD, Moscow state University of food production (Russia, Moscow)
Patrakhina T., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Yakovleva A., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Kovalenko S., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Kosolapov D., PhD, Papanin Institute of biology of inland waters of Russian Academy of Sciences (Russia, Borok)
Zinoviev E., PhD, Institute of ecology of plants and animals UB RAS (Russia, Ekaterinburg)
Ocheretina R., MD, Ilizarov Russian scientific center “Restorative traumatology and Orthopaedics” (Russia, Kurgan)
Kosolapova N., PhD, Papanin Institute of biology of inland waters of Russian Academy of Sciences (Russia, Borok)
Sibiryakova E., PhD, Kiev National University of Culture and Arts (Ukraine, Kiev)
Rodionov A., Dr. habil., Platov Southern Russian state polytechnical university (Russia, Kamensk–Shakhtinsky)
Salayev S., Dr. habil., al–Khwarizmi Urgench State university (Uzbekistan, Urgench)
Gorshkov–Cantacuzène V., TD, DSc (hon), International Society of Hypertension, (UK, Middlesex)
Resp. Secretary of editorial Board: E. S. Ovechkina
The “Bulletin of Science and Practice” Journal is included in scientific electronic library (RINTs), the Electronic and library system IPRbooks, ZENODO, ACADEMIA, Google Scholar, Almetric, AcademicKeys (interuniversity library system) libraries of the USA, Canada, Germany, etc., is indexed in the international bases: ResearchBib (Academic Resource Index), Index Copernicus Search Articles, The Journals Impact Factor (JIF), the International society on research activity (ISRA), Scientific Indexing Services (SIS), the Eurasian scientific index of Journals (Eurasian Scientific Journal Index (ESJI) Join the Future of Science and Art Evaluation, Open Academic Journals Index (OAJI), International Innovative Journal Impact Factor (IIJIF).
Global Impact–factor (GIF) “Bulletin of Science and Practice” for 2015 — 0,454.
License type supported CC: Attribution 4.0 International (CC BY 4.0).
The journal addresses issues of global and regional science and practice. For scientists, teachers, graduate students, students.
Bulletin of Science and Practice. Electronic Journal, 2016, no. 4 (5). Available at: http://www.bulletennauki.com
Editor–in–chief — PhD E. S. Ovechkina
Editorial Board:
Nitsenko V., Dr. habil., Mechnikov Odessa national University (Ukraine, Odessa)
Ibragimova L., Dr. habil., Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Sokolov S., Dr. habil., Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Urazaeva L., PhD, Surgut state pedagogical University (Russia, Surgut)
Soldatova S., PhD, Moscow state University of food production (Russia, Moscow)
Patrakhina T., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Yakovleva A., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Kovalenko S., PhD, Nizhnevartovsk state University (Russia, Nizhnevartovsk)
Kosolapov D., PhD, Papanin Institute of biology of inland waters of Russian Academy of Sciences (Russia, Borok)
Zinoviev E., PhD, Institute of ecology of plants and animals UB RAS (Russia, Ekaterinburg)
Ocheretina R., MD, Ilizarov Russian scientific center “Restorative traumatology and Orthopaedics” (Russia, Kurgan)
Kosolapova N., PhD, Papanin Institute of biology of inland waters of Russian Academy of Sciences (Russia, Borok)
Sibiryakova E., PhD, Kiev National University of Culture and Arts (Ukraine, Kiev)
Rodionov A., Dr. habil., Platov Southern Russian state polytechnical university (Russia, Kamensk–Shakhtinsky)
Salayev S., Dr. habil., al–Khwarizmi Urgench State university (Uzbekistan, Urgench)
Gorshkov–Cantacuzène V., TD, DSc (hon), International Society of Hypertension, (UK, Middlesex)
Resp. Secretary of editorial Board: E. S. Ovechkina
The “Bulletin of Science and Practice” Journal is included in scientific electronic library (RINTs), the Electronic and library system IPRbooks, ZENODO, ACADEMIA, Google Scholar, Almetric, AcademicKeys (interuniversity library system) libraries of the USA, Canada, Germany, etc., is indexed in the international bases: ResearchBib (Academic Resource Index), Index Copernicus Search Articles, The Journals Impact Factor (JIF), the International society on research activity (ISRA), Scientific Indexing Services (SIS), the Eurasian scientific index of Journals (Eurasian Scientific Journal Index (ESJI) Join the Future of Science and Art Evaluation, Open Academic Journals Index (OAJI), International Innovative Journal Impact Factor (IIJIF).
Global Impact–factor (GIF) “Bulletin of Science and Practice” for 2015 — 0,454.
License type supported CC: Attribution 4.0 International (CC BY 4.0).
The journal addresses issues of global and regional science and practice. For scientists, teachers, graduate students, students.
Bulletin of Science and Practice. Electronic Journal, 2015, no. 1 (1). Available at: http://www.bulletennauki.com
The binding of cosmological structures by massless topological defectsSérgio Sacani
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
Phenomics assisted breeding in crop improvementIshaGoswami9
As the population is increasing and will reach about 9 billion upto 2050. Also due to climate change, it is difficult to meet the food requirement of such a large population. Facing the challenges presented by resource shortages, climate
change, and increasing global population, crop yield and quality need to be improved in a sustainable way over the coming decades. Genetic improvement by breeding is the best way to increase crop productivity. With the rapid progression of functional
genomics, an increasing number of crop genomes have been sequenced and dozens of genes influencing key agronomic traits have been identified. However, current genome sequence information has not been adequately exploited for understanding
the complex characteristics of multiple gene, owing to a lack of crop phenotypic data. Efficient, automatic, and accurate technologies and platforms that can capture phenotypic data that can
be linked to genomics information for crop improvement at all growth stages have become as important as genotyping. Thus,
high-throughput phenotyping has become the major bottleneck restricting crop breeding. Plant phenomics has been defined as the high-throughput, accurate acquisition and analysis of multi-dimensional phenotypes
during crop growing stages at the organism level, including the cell, tissue, organ, individual plant, plot, and field levels. With the rapid development of novel sensors, imaging technology,
and analysis methods, numerous infrastructure platforms have been developed for phenotyping.
Authoring a personal GPT for your research and practice: How we created the Q...Leonel Morgado
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptxMAGOTI ERNEST
Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
Brine shrimp (Artemia spp.) are used in marine aquaculture worldwide. Annually, more than 2,000 metric tons of dry cysts are used for cultivation of fish, crustacean, and shellfish larva. Brine shrimp are important to aquaculture because newly hatched brine shrimp nauplii (larvae) provide a food source for many fish fry (Mozanzadeh et al., 2021). Culture and harvesting of brine shrimp eggs represents another aspect of the aquaculture industry. Nauplii and metanauplii of Artemia, commonly known as brine shrimp, play a crucial role in aquaculture due to their nutritional value and suitability as live feed for many aquatic species, particularly in larval stages (Sorgeloos & Roubach, 2021).
Immersive Learning That Works: Research Grounding and Paths ForwardLeonel Morgado
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skills
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Wang W., Makeev A., Povorov S. Experimental investigation on performances of plate heat exchanger’s cold side for lubrication/water - water heat transfer
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Рейнольдса, и это показано на рисунке. Таким образом, можно обнаружить, что, когда число
Пекле меньше 2500, его возрастание приводит к увеличению числа Нуссельта.
В конечном итоге, получаем характеристики теплообмена холодной стороны
пластинчатого теплообменника для типов сред теплоносителей масло/вода — вода.
Keywords: plate heat exchanger, thermal-hydraulic, convective heat transfer coefficient,
Peclet number.
Ключевые слова: пластинчатый теплообменник, термогидравлический, коэффициент
конвективной теплопередачи, число Пекле.
Introduction
The plate heat exchangers are widely used in warming, heating, cooling applications, food,
and cosmetic and chemistry industry. The plate type heat exchangers are initially developed for the
pasteurized liquid food domain which mostly requires hygienic application. But, these heat
exchangers have a large application area in chemistry and food sector because of being compact and
having the quality to be easily cleaned [1–5].
Some examples to active method include the use of mechanical auxiliary elements, turning of
surface, mixing of fluid with mechanical parts, constituting of electron–static areas in flow area,
vibration of system, etc., Some examples to passive method include covering of surface, changing
of surface, forming of the same projection parts of the rough surface, locating of the tabulators in
flow area, etc. [6–7]. Mishra et al. [8] incorporated a genetic–algorithm–based optimization
technique for a cross–flow plate and fin heat exchanger to minimize the total entropy generated
within a prescribed heat duty. Cheng [9] proposed the concept of entropy resistance based on the
entropy generation analysis as an alternative method for heat exchanger analysis. Fakheri [10] used
the second law of thermodynamics to determine the exchanger thermal efficiency through the ratio
of the actual heat transfer rate to the optimum heat transfer rate. By the way, Zheng et al. [11]
further studied flooded boiling of pure ammonia and ammonia/lubricant mixture on a plain
horizontal tube subjected to a vapor quality at the inlet of the evaporator. Khan et al. [12] used
Mixed chevron angle plate configuration to do experiment with miscible oil–ammonia. Zhang et al.
[13] investigated the performance of oil cooler with helical baffles (OCHB) and compared with that
of the segmental one (OCSB) with practical size, and also found that the shell side heat transfer
coefficients and the shell–side pressure drop of the OCHB are respectively lower than and far lower
than those of the OCSB.
In this study, the thermal–hydraulic characters of the plate heat exchangers on heat transfer,
Nu, f and Pe numbers base, is experimentally examined.
Experimental setup procedure
Details of the experimental set-up of PHE are shown in the schematic layout (Figure 1). Red
and blue arrow marks with trace the hot lubrication/water and cold water respectively. Circulating
lubrication/water is stored in electric boiler (1), condenser (17), and cooling tower (19).
Reciprocating pump (2) propels the heated lubrication/water which comes from the electric boiler
and heats to the desired temperature with 0.08–0.1 L/s to the plate heat exchanger where it is
converted with cold water, Reciprocating pump (16) propels the cooled water which comes from the
condenser and cools to the desired temperature with different volume velocity to the plate heat
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exchanger where it is converted with hot lubrication/water. Maximum operating pressure and
temperature of the electric boiler are 4 Ba and 80 °C.
Investigation of the flow distribution in PHE is carried out for 13 plates (12 channels). The
turbine type rotary mechanical flow meters (4 & 14) and four PT-100 thermometers (6, 7, 10 & 12)
are provided in hot lubrication/water and cold-water flow path to measure the volume flow rates
and temperatures, respectively. Thermometers are placed near to the ports of PHE in the stainless-
steel pipe section at the inlet and outlet of water. Four pressure transmitters (5, 8–9 & 13) are placed
near the thermometers to measure the fluid pressure. Flow rates of the working fluid being pumped
by pumps (2 & 16), is controlled by the pump’s speed. Mechanical flow meters (turbine type flow
meter), pressure transmitters and thermometers are connected to a Programming Logic Controller
(PLC), which is further connected to a human interface unit (HMI), measure and control the flow
rates of hot and cold fluid streams. They also measure the pressure and temperature at the inlet and
outlet of both the fluid streams.
Figure 1. Schematic layout of experimental set-up: 1 — electric boiler; 2 — first pump; 3 — first vale;
4 — first flow meter; 5 — first pressure transmitter; 6 — first temperature transmitter; 7 — second
temperature transmitter; 8 — second pressure transmitter; 9 — third pressure transmitter; 10 — third
temperature transmitter; 11 — PHEs ; 12 — fourth temperature transmitter; 13 — fourth pressure
transmitter; 14 — second flow meter; 15 — second valve; 16 — second pump; 17 — condenser; 18 —
third valve; 19 — cooling tower.
Data reduction
The experimental data have been obtained under steady state conditions and the operating
flow rates were taken to have a range of Reynolds number from 220 to 2400 for PHE. The mean
pressure drop data obtained using pressure transmitters was used in the following equation to
evaluate Fanning friction factor ( ):
(1)
f
2
ch2 VL
DP
f
eqch
=
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where is pressure drop, Pa;
is hydraulic diameter, m;
is port to port length, m;
is the density of the water, kg/m3
;
is the velocity of the water,m/s.
The measured pressure drop of PHE includes the frictional pressure drop in the channels and
the pressure drop in the ports.
(2)
where is pressure drop in port.
The channel pressure drop is dined by using the Darcy friction factor model as below:
(3)
where is the channel friction factor that is determined by correlation obtained from Focke
et al. [14]; is the port to port length, m.
To calculate the pressure, drop in the ports Shah and Focke [15] correlation is used as follows:
(4)
where the u is velocity in port, m/s.
The behavior of hydraulic resistance with Reynolds number is shown in
Figure 3. The Reynolds number for plate heat exchanger is defined on the basis of hydraulic
diameter , as:
(5)
where is Kinematic viscosity, m2
/s.
With respect to the average heat transfer coefficient ( ), it was calculated by:
(6)
where is the heat transfer rate (use to calculate), W;
is the heating wall surface area, m2
;
is the logarithmic mean temperature difference which is given by:
P
eqD
chL
V
pch PPP +=
pP
=
2
4
2
V
D
L
fP
eq
p
ch
f
pL
2
5.1
2
u
Pp
=
eqD
eqVD
=Re
h
mi
i
i
TS
Q
h
=
iQ
2
ch QQ
Q
+
=
iS
mT
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(7)
where is cold inlet flow temperature, K;
is cold outlet flow temperature, K;
is hot inlet flow temperature, K;
is hot outlet flow temperature, K.
In the heat transfer at a surface within a fluid, the Nusselt number ( ) is the ratio of the
convective to the conductive heat transfer across normal to the boundary and it is given by:
(8)
where is the convective heat transfer coefficient, w/(m2
*k);
is the thermal conductivity, w/(m*k).
Also, the Peclet number is defined as:
(9)
Results and discussion
Figure 2 shows the convective heat transfer coefficient versus Reynolds number at different
velocity. Based on these results the convective heat transfer coefficient increases with enhancement
of Reynolds number and after a certain Reynolds number the convective heat transfer coefficient in
water–water is stable, but the it continued grows up in lubrication–water. The data in water–water
bigger than lubrication–water because of different heat capacity. As shown in Figure 2, data
tendency changes quickly at the range of Reynolds number from 300 to 500 that it maybe depends
on increasing of turbulence intensity at higher Reynolds number and decrements in fluid thermal
boundary layer thickness due to the reduction of fluid viscosity near the wall. Also, for water–water,
heat exchange comes into full development stage and thermal boundary layer remains unchanged
after Reynolds number more than 500.
Figure 2. Convective heat transfer coefficient changed with Reynolds number.
( ) ( )
−
−
−−−
=
incouth
outcinh
incouthoutcinh
m
TT
TT
Ln
TTTT
T
..
..
....
incT .
outcT .
inhT .
outhT .
Nu
eqhD
Nu =
h
PrRe=Pe
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Figure 3 shows the behavior of the Fanning friction factor with Reynolds number. It is
observed that Fanning friction factor decreases with an increase in the Reynolds number. This is due
to a tremendous increase in turbulence at higher Reynolds number within plates. At higher
Reynolds number, fluid molecules get lesser time to interact with plate surface, and hence lower
friction between the plates and fluid particles. We can find that lubrication–water has low heat and
velocity loss than water–water.
Figure 3. Variations of Fanning friction factor with Reynolds number.
The variation of the Nusselt number as a function of the Peclet number for all the case studies
with plate heat exchanger is presented in Figure 4, in which it is possible to observe that the
increase of the Peclet number results in an increase of the Nusselt number as well when Peclet
number small than 2500 in water–water, however, Nusselt number directly adds with Peclet number
in lubrication–water. The increase of the Nusselt number indicates an enhancement in the heat
transfer coefficient due to the convection increases. The Nusselt number almost keep constant after
Peclet number more than 2500 in certain situation, that is mean thermal resistance over convective
resistance is hardly to change with Peclet number.
Figure 4. Behavior of the Nusselt number as a function on the Peclet number in PHE.
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Conclusion
Thermal–hydraulic performance analysis cold side of PHE are experimentally investigated
under steady–state conditions. The hot lubrication/water inlet keep temperature and flow rate
constant at 72 °C and 0.1 L/s, the cold–water inlet remained 12 °C flows different velocity. Then the
convective heat transfer coefficient increases with enhancement of Reynolds number and the result
in water–water higher than lubrication–water. Moreover, it is observed that Fanning friction factor
decreases with an increase of the Reynolds number and it is showed by the figure. Therefore, it is
possible to find that the increase of the Peclet number results in an increase of Nusselt number as
well when Peclet number small than 2500 in water–water. The increase of the Nusselt number
indicates an enhancement in the heat transfer coefficient due to the convection increases. The
Nusselt number will keep constant after the certain Peclet number, that is mean thermal resistance
over convective resistance is hardly to change with Peclet number. Through this research work, it
provides thermal exchanging feature in water–water and lubrication–water using plate heat
exchanger.
References:
1. Zaleski, T., & Klepacka, K. (1992). Plate heat exchangers-method of calculation, charts and
guidelines for selecting plate heat exchanger configurations. Chemical Engineering and Processing:
Process Intensification, 31(1), 49-56.
2. Rohsenow, W. M., & Cho, Y. I. (1998). Handbook of heat transfer (Vol. 3). J. P. Hartnett
(Ed.). New York, McGraw-Hill.
3. Bennett, C. O., & Myers, J. E. (1982). Momentum, heat, and mass transfer. 3rd ed. New
York, McGraw-Hill, McGraw-Hill chemical engineering series, 832.
4. Bergles, A. E. (1973). Techniques to augment heat transfer. Handbook of heat transfer. (A
74-17085 05-33) New York, McGraw-Hill Book Co., 1973, 10-1.
5. Bergies, E. A. (1999). The imperative to enhance heat transfer. Heat Transfer Enhancement
of Heat Exchangers. Dordrecht, Springer, 13-29.
6. Dewan, A., Mahanta, P., Raju, K. S., & Kumar, P. S. (2004). Review of passive heat
transfer augmentation techniques. Proceedings of the Institution of Mechanical Engineers, Part A:
Journal of Power and Energy, 218(7), 509-527.
7. Baehr H. D., Stephan K. Wärme - und Stoffübertragung. Aktualisierte Auflage. Berlin,
Heidelberg, Springer Verlag, 2013, XXIV, 804.
8. Mishra, M., Das, P. K., & Sarangi, S. (2009). Second law based optimization of crossflow
plate-fin heat exchanger design using genetic algorithm. Applied Thermal Engineering, 29(14-15),
2983-2989.
9. Cheng, X. (2013). Entropy resistance minimization: An alternative method for heat
exchanger analyses. Energy, 58, 672-678. doi:10.1016/j.energy.2013.05.024
10. Fakheri, A. (2007). Heat exchanger efficiency. Journal of Heat Transfer, 129(9), 1268-
1276.
11. Zheng, J. X., Jin, G. P., Chyu, M. C., & Ayub, Z. H. (2006). Boiling of ammonia/lubricant
mixture on a horizontal tube in a flooded evaporator with inlet vapor quality. Experimental thermal
and fluid science, 30(3), 223-231.
12. Khan, M. S., Khan, T. S., Chyu, M. C., & Ayub, Z. H. (2012). Experimental investigation
of evaporation heat transfer and pressure drop of ammonia in a 30 chevron plate heat exchanger.
International Journal of refrigeration, 35(6), 1757-1765.
8. Бюллетень науки и практики / Bulletin of Science and Practice
http://www.bulletennauki.com
Т. 4. №6. 2018
177
13. Zhang, J. F., Guo, S. L., Li, Z. Z., Wang, J. P., He, Y. L., & Tao, W. Q. (2013).
Experimental performance comparison of shell-and-tube oil coolers with overlapped helical baffles
and segmental baffles. Applied Thermal Engineering, 58(1-2), 336-343.
14. Focke, W. W., Zachariades, J., & Olivier, I. (1985). The effect of the corrugation
inclination angle on the thermohydraulic performance of plate heat exchangers. International
Journal of Heat and Mass Transfer, 28(8), 1469-1479.
15. Shah, R. K., & Focke, W. W. (1988). Plate heat exchangers and their design theory. Heat
Transfer Equipment Design, 227, 254.
Список литературы:
1. Zaleski T., Klepacka K. Plate heat exchangers-method of calculation, charts and guidelines
for selecting plate heat exchanger configurations // Chemical Engineering and Processing: Process
Intensification. 1992. V. 31. No. 1. P. 49-56.
2. Rohsenow W. M. et al. Handbook of heat transfer. New York: McGraw-Hill, 1998. V. 3.
3. Bennett C. O., Myers J. E. Momentum, heat, and mass transfer. 3rd ed. New York,
McGraw-Hill: McGraw-Hill chemical engineering series, 1982. 832 p.
4. Bergles A. E. Techniques to augment heat transfer // Handbook of heat transfer. (A 74-
17085 05-33). New York: McGraw-Hill Book Co., 1973, 1973. P. 10-1.
5. Bergies E. A. The imperative to enhance heat transfer // Heat Transfer Enhancement of
Heat Exchangers. Dordrecht: Springer, 1999. P. 13-29.
6. Dewan A., Mahanta P., Raju K. S., Kumar P. S. Review of passive heat transfer
augmentation techniques // Proceedings of the Institution of Mechanical Engineers, Part A: Journal
of Power and Energy. 2004. V. 218. №7. P. 509-527.
7. Baehr H. D., Stephan K. Wärme - und Stoffübertragung. Aktualisierte Auflage. Berlin-
Heidelberg: Springer Verlag, 2013. XXIV. 804 s.
8. Mishra M., Das P. K., Sarangi S. Second law based optimisation of crossflow plate-fin heat
exchanger design using genetic algorithm // Applied Thermal Engineering. 2009. V. 29. №14-15. P.
2983-2989.
9. Cheng X. Entropy resistance minimization: An alternative method for heat exchanger
analyses // Energy. 2013. V. 58. P. 672-678. DOI: 10.1016/j.energy.2013.05.024.
10. Fakheri A. Heat exchanger efficiency // Journal of Heat Transfer. 2007. V. 129. №9.
P. 1268-1276.
11. Zheng J. X., Jin G. P., Chyu M. C., Ayub Z. H. Boiling of ammonia/lubricant mixture on a
horizontal tube in a flooded evaporator with inlet vapor quality // Experimental thermal and fluid
science. 2006. V. 30. №3. P. 223-231.
12. Khan M. S., Khan T. S., Chyu M. C., Ayub Z. H. Experimental investigation of
evaporation heat transfer and pressure drop of ammonia in a 30 chevron plate heat exchanger //
International Journal of refrigeration. 2012. V. 35. №6. P. 1757-1765.
13. Zhang J. F., Guo S. L., Li Z. Z., Wang J. P., He Y. L., Tao W. Q. Experimental
performance comparison of shell-and-tube oil coolers with overlapped helical baffles and segmental
baffles // Applied Thermal Engineering. 2013. V. 58. №1-2. P. 336-343.
14. Focke W. W., Zachariades J., Olivier I. The effect of the corrugation inclination angle on
the thermohydraulic performance of plate heat exchangers // International Journal of Heat and Mass
Transfer. 1985. V. 28. №8. P. 1469-1479.
15. Shah R. K., Focke W. W. Plate heat exchangers and their design theory // Heat Transfer
Equipment Design. 1988. V. 227. P. 254.
9. Бюллетень науки и практики / Bulletin of Science and Practice
http://www.bulletennauki.com
Т. 4. №6. 2018
178
Работа поступила
в редакцию 22.05.2018 г.
Принята к публикации
27.05.2018 г.
________________________________________________________________________________
Cite as (APA):
Wang, W., Makeev, A., & Povorov, S. (2018). Experimental investigation on performances of
plate heat exchanger’s cold side for lubrication/water - water heat transfer. Bulletin of Science and
Practice, 4(6), 170-178.
Ссылка для цитирования:
Wang W., Makeev A., Povorov S. Experimental investigation on performances of plate heat
exchanger’s cold side for lubrication/water - water heat transfer // Бюллетень науки и практики.
2018. Т. 4. №6. С. 170-178. Режим доступа: http://www.bulletennauki.com/wang-makeev (дата
обращения 15.06.2018).