This document discusses computational fluid dynamics (CFD) analysis of turbulence in a gas turbine combustor with reference to exit phenomena. It summarizes several studies that have used experimental and computational methods to model combustor exit profiles and their effects on secondary flows in turbine vanes. The document outlines CFD models of different combustor configurations, including variations in cooling schemes, dilution jets, and exit slots. Results show that dilution jets and exit slots can create non-uniformities in temperature, pressure and velocity at the combustor exit which influence the development of secondary flows in downstream vanes. Understanding these interactions is important for improving turbine performance and cooling effectiveness.
Heat Transfer Analysis of Refrigerant Flow in an Evaporator TubeIJMER
the paper aim is to presenting the heat transfer analysis of refrigerant flow in an evaporator
tube is done. The main objective of this paper is to find the length of the evaporator tube for a pre-defined
refrigerant inlet state such that the refrigerant at the tube outlet is superheated. The problem involves
refrigerant flowing inside a straight, horizontal copper tube over which water is in cross flow. Inlet
condition of the both fluids and evaporator tube detail except its length are specified. here pressure and
enthalpy at discrete points along the tube are calculated by using two-phase frictional pressure drop model.
Predicted values were compared using another different pressure drop model. A computer-code using
Turbo C has been developed for performing the entire calculation
This document summarizes an experimental investigation into the effects of nonperiodic inlet rotating flow on endwall film cooling in neighboring turbine passages. The experiment compares film cooling effectiveness for three configurations of anticlockwise rotating inlet flow, analyzed using pressure-sensitive painting. Key findings include: 1) Inlet rotating flow influences effectiveness upstream, especially from leakage flows. 2) Effectiveness differs between passages depending on rotating flow core position. 3) Downstream effectiveness is also partly influenced by upstream rotating flow. Rotating inlet flow introduces challenges for film cooling design between neighboring passages in gas turbines.
Numerical Simulations on Jet Impingement Cooling of Cylindrical SurfacesIRJET Journal
This document summarizes a numerical study on jet impingement cooling of cylindrical surfaces. Jet impingement exhibits non-uniform heat transfer on cylinders, with maximum heat transfer at the jet stagnation zone and local maxima/minima occurring along the circumference due to transition between laminar and turbulent flow. Parameters studied include jet Reynolds number and cylinder to jet diameter ratio. Results for smooth cylinders matched literature. Heat transfer decreases with Reynolds number from 100 to 1000 but increases beyond 1000. The study aims to address gaps in understanding jet impingement cooling effects on cylinders.
Heat Transfer Enhancement through Liquid Jet ImpingementIRJET Journal
This document provides a literature review on experimental and computational studies of liquid jet impingement heat transfer. It summarizes various parameters that influence jet impingement heat transfer such as flow rate, nozzle size, inlet pressure, and working medium properties. It then reviews over 30 experimental and computational studies on topics like the effects of nozzle geometry, surface roughness, nanofluids, vortex generators, swirling jets, and more. The overall goal is to provide an overview of recent approaches to studying jet impingement heat transfer processes.
Helically Coiled Tube with Different Geometry and Curvature Ratio on Convecti...AM Publications
A helically coil-tube heat exchanger is generally applied in industry applications due to its compact structure, larger heat transfer area and higher heat transfer capability. Several studies from literature have also indicated that heat transfer rate in helically coiled tube are superior to straight tube due to complex flow pattern exist inside helical pipe. The concept behind compact heat exchanger is to decrease size and increase heat load which is the typical feature of modern helical tube heat exchanger. While the heat transfer characteristics of helical coil heat exchangers are available in the literature, This paper elaborates a brief review on different curvature ratio and geometry of tubes in heat transfer through heat exchangers.
The document summarizes an experimental and computational fluid dynamics (CFD) analysis of a vortex tube. A vortex tube produces hot and cold air streams from a single source of compressed air without any moving parts. The study examined a vortex tube made of CPVC material, which is cheaper and lighter than metals typically used. CFD simulations were conducted to model the vortex tube. While various theories have been proposed, the temperature separation phenomenon in vortex tubes is not fully understood due to the complex turbulence inside the device. Parameters like inlet pressure and orifice diameter were analyzed to understand their effects on the performance.
An experimental study on the airlift packed column with adjustable heightIAEME Publication
This document presents an experimental study on an airlift packed column with adjustable height and multiple air injection points. The study aims to improve liquid flow rate and total head of the system. Experiments were conducted by varying submersion ratio, air flow rate, and number of air injection nozzles. Results show that liquid flow rate increases with higher submersion ratio, air flow rate, and number of nozzles. Using multiple nozzles distributed along the column maintains both high liquid flow rate due to increased gas holdup and total head. The system offers applications in heat and mass transfer operations with adjustable packed bed height and efficient liquid distribution.
Heat Transfer Analysis of Refrigerant Flow in an Evaporator TubeIJMER
the paper aim is to presenting the heat transfer analysis of refrigerant flow in an evaporator
tube is done. The main objective of this paper is to find the length of the evaporator tube for a pre-defined
refrigerant inlet state such that the refrigerant at the tube outlet is superheated. The problem involves
refrigerant flowing inside a straight, horizontal copper tube over which water is in cross flow. Inlet
condition of the both fluids and evaporator tube detail except its length are specified. here pressure and
enthalpy at discrete points along the tube are calculated by using two-phase frictional pressure drop model.
Predicted values were compared using another different pressure drop model. A computer-code using
Turbo C has been developed for performing the entire calculation
This document summarizes an experimental investigation into the effects of nonperiodic inlet rotating flow on endwall film cooling in neighboring turbine passages. The experiment compares film cooling effectiveness for three configurations of anticlockwise rotating inlet flow, analyzed using pressure-sensitive painting. Key findings include: 1) Inlet rotating flow influences effectiveness upstream, especially from leakage flows. 2) Effectiveness differs between passages depending on rotating flow core position. 3) Downstream effectiveness is also partly influenced by upstream rotating flow. Rotating inlet flow introduces challenges for film cooling design between neighboring passages in gas turbines.
Numerical Simulations on Jet Impingement Cooling of Cylindrical SurfacesIRJET Journal
This document summarizes a numerical study on jet impingement cooling of cylindrical surfaces. Jet impingement exhibits non-uniform heat transfer on cylinders, with maximum heat transfer at the jet stagnation zone and local maxima/minima occurring along the circumference due to transition between laminar and turbulent flow. Parameters studied include jet Reynolds number and cylinder to jet diameter ratio. Results for smooth cylinders matched literature. Heat transfer decreases with Reynolds number from 100 to 1000 but increases beyond 1000. The study aims to address gaps in understanding jet impingement cooling effects on cylinders.
Heat Transfer Enhancement through Liquid Jet ImpingementIRJET Journal
This document provides a literature review on experimental and computational studies of liquid jet impingement heat transfer. It summarizes various parameters that influence jet impingement heat transfer such as flow rate, nozzle size, inlet pressure, and working medium properties. It then reviews over 30 experimental and computational studies on topics like the effects of nozzle geometry, surface roughness, nanofluids, vortex generators, swirling jets, and more. The overall goal is to provide an overview of recent approaches to studying jet impingement heat transfer processes.
Helically Coiled Tube with Different Geometry and Curvature Ratio on Convecti...AM Publications
A helically coil-tube heat exchanger is generally applied in industry applications due to its compact structure, larger heat transfer area and higher heat transfer capability. Several studies from literature have also indicated that heat transfer rate in helically coiled tube are superior to straight tube due to complex flow pattern exist inside helical pipe. The concept behind compact heat exchanger is to decrease size and increase heat load which is the typical feature of modern helical tube heat exchanger. While the heat transfer characteristics of helical coil heat exchangers are available in the literature, This paper elaborates a brief review on different curvature ratio and geometry of tubes in heat transfer through heat exchangers.
The document summarizes an experimental and computational fluid dynamics (CFD) analysis of a vortex tube. A vortex tube produces hot and cold air streams from a single source of compressed air without any moving parts. The study examined a vortex tube made of CPVC material, which is cheaper and lighter than metals typically used. CFD simulations were conducted to model the vortex tube. While various theories have been proposed, the temperature separation phenomenon in vortex tubes is not fully understood due to the complex turbulence inside the device. Parameters like inlet pressure and orifice diameter were analyzed to understand their effects on the performance.
An experimental study on the airlift packed column with adjustable heightIAEME Publication
This document presents an experimental study on an airlift packed column with adjustable height and multiple air injection points. The study aims to improve liquid flow rate and total head of the system. Experiments were conducted by varying submersion ratio, air flow rate, and number of air injection nozzles. Results show that liquid flow rate increases with higher submersion ratio, air flow rate, and number of nozzles. Using multiple nozzles distributed along the column maintains both high liquid flow rate due to increased gas holdup and total head. The system offers applications in heat and mass transfer operations with adjustable packed bed height and efficient liquid distribution.
The results show that, with proper selection of physical parameters, significant heat transfer
enhancements and pressure drop reductions can be achieved simultaneously with porous pin fins and
the overall heat transfer performances in porous pin fin channels are much better than those in
traditional solid pin fin channels. The effects of pore density are significant. As PPI increases, the
pressure drops and heat fluxes in porous pin fin channels increase while the overall heat transfer
efficiencies decrease and the maximal overall heat transfer efficiencies are obtained at PPI 20.
Furthermore, the effects of pin fin form are also remarkable. With the same physical parameters, the
overall heat transfer efficiencies in the long elliptic porous pin fin channels are the highest while they
are the lowest in the short elliptic porous pin fin channels
IRJET- Study of Jet Impingement Heat TransferIRJET Journal
This document reviews research on jet impingement heat transfer. It discusses the flow and heat transfer characteristics of single and multiple impinging jets. Key factors that influence heat transfer are jet Reynolds number, nozzle-to-plate spacing, jet pattern, and crossflow. The document summarizes various empirical correlations that have been developed to predict average heat transfer coefficients. It also reviews numerical studies on modeling heat transfer for multi-jet systems and discusses the effects of parameters like Reynolds number, nozzle spacing, crossflow, and jet interference.
The document summarizes previous research on natural convection heat transfer through inclined parallel plates. It reviews several studies that have experimentally investigated the effects of plate inclination angle and spacing on heat transfer rate. The studies found that plate inclination can both increase and decrease heat transfer compared to vertical plates, depending on whether the plate is heated from below or above. They also observed that natural convection heat transfer depends on factors like Rayleigh number, Nusselt number, and the aspect ratio of plate spacing to length. The document concludes there remains scope for further research to develop more accurate correlations for modeling buoyancy-driven mass and heat transfer through inclined parallel plates.
Prediction of friction factor and non dimensions numbers in force convectionIAEME Publication
This document summarizes an experimental study on heat transfer in an insulated cylindrical pipe. The study measured parameters like Nusselt number, Reynolds number, and frictional factor under different flow conditions. Experiments were conducted with air flow through a 40mm diameter pipe with 5mm insulation. Measurements were taken for 1/3, 2/3, and full opening of a control valve, and results were validated against analytical calculations using common heat transfer equations. Experimental values matched well with theoretical predictions.
An experimental study of heat transfer in a corrugated plate heat exchangerIAEME Publication
1. The document discusses an experimental study of heat transfer in a corrugated plate heat exchanger. Experiments were conducted to analyze heat transfer characteristics for different flow arrangements of hot and cold fluids through the heat exchanger.
2. The effectiveness and exergy loss of the heat exchanger were calculated for parallel and counter flow arrangements. The average effectiveness was found to be 48% higher and exergy loss 33% lower in the counter flow arrangement compared to the parallel flow arrangement.
3. Maximum heat transfer was observed at the highest hot fluid inlet temperature of 70°C, being 5% greater in the parallel flow arrangement. However, the non-dimensional exergy loss and log mean temperature difference were both lower in the
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Mixed convection heat transfer in inclined tubes with constant heat flux, eur...Ahmed Al-Sammarraie
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Mixed convection heat transferin inclined tubes with constant heat fluxOzyegin University
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Design of heat transfer surfaces in agitated vesselsArcangelo Di Tano
This document discusses heat transfer surfaces used in agitated vessels. It presents three main types of heat transfer surfaces: jackets, helical coils, and spiral coils. Vertical tube baffles are also discussed. The overall heat transfer coefficient is determined based on convection mechanisms and is used to calculate the necessary heat exchange area. A numerical example is provided to calculate the heat transfer area for an agitated vessel using vertical tube baffles and a pitched blade turbine. The same calculation is done for a radial impeller turbine to compare heat transfer efficiencies.
IRJET- Investigation of Fluid Flow Characteristics for the Forced Convect...IRJET Journal
This document summarizes a study that used computational fluid dynamics (CFD) to investigate fluid flow characteristics over heated elliptical and circular shaped tubes. The study varied the Reynolds number from 438 to 1227 and found that elliptical tubes had lower pressure drop and friction factor values than circular tubes. Velocity distributions showed smaller wakes behind elliptical tubes. Pressure drop and friction factor both increased with Reynolds number but elliptical tubes performed better in both areas. The study concluded elliptical tubes provided better heat transfer characteristics than circular tubes of the same hydraulic diameter.
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.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
The document summarizes an experimental study comparing the performance of a helical coil heat exchanger to a straight tube heat exchanger. Researchers designed, fabricated, and tested both types of heat exchangers. Results showed that the helical coil design had higher heat transfer rates, effectiveness, and overall heat transfer coefficients than the straight tube design across all flow rates and operating conditions. This is because the coiled tube shape induces secondary fluid flows that enhance mixing and heat transfer compared to the straight tube. The study concludes that helical coil heat exchangers have better performance than straight tube designs for industrial heat exchange applications.
Evaluation of thermal performance of a typical vapor compression refrigeratio...Saif al-din ali
This document describes an experiment conducted to evaluate the thermal performance of a typical vapor compression refrigeration cycle. The objectives were to learn about the components and analyze the cycle. Readings were taken of various temperatures and pressures. Calculations were done to determine compressor work, refrigeration effect, and coefficient of performance. Questions were asked about how to increase COP, the influence of temperatures, detecting refrigerant leaks, processes in the condenser, and functions of cycle components.
Design and analysis of plate heat exchanger with co2 and r134a as working fIAEME Publication
This document describes the design and analysis of a plate heat exchanger using CO2 and R134a as working fluids. The authors modeled the plate heat exchanger in Solidworks and analyzed it using computational fluid dynamics in ANSYS. They calculated the heat transfer coefficients, Nusselt number, Reynolds number, and overall heat transfer coefficient. The results from the CFD analysis matched closely with the theoretical calculations. The analysis showed a low pressure drop and the optimal design achieved a small temperature difference between the inlet and outlet of both fluids.
Experimental Analysis Of Heat Transfer From Square Perforated Fins In Stagger...IJERA Editor
This project gives the experimental analysis of heat transfer over a flat surface equipped with Square perforated
pin fins in staggered arrangement in a rectangular channel. The Fin dimensions are 100mm in height & 25mm in
width. The range of Reynolds number is fixed & about 13,500– 42,000, the clearance ratio (C/H) 0, 0.33 and 1,
the inter-fin spacing ratio (Sy /D) 1.208, 1.524, 1.944 and 3.417. Sy i.e. stream wise distance is varies and Sx i.e.
span wise distance is constant. The friction factor, enhancement efficiency and heat transfer correlate in
equations with each other. Here we are comparing Square pin fins with cylindrical pin fins. Staggered
arrangement and perforation will enhance the heat transfer rate. Clearance ratio and inter-fin spacing ratio affect
on Enhancement efficiency. Both lower clearance ratio and lower inter-fin spacing ratio and comparatively lower
Reynolds number give higher thermal performance. Friction factor & Nusselt number are Key parameter which
relates with efficiency enhancement and heat transfer rate.
Shell & tube heat exchanger single fluid flow heat transferVikram Sharma
This article was produced to highlight the fundamentals of single-phase heat exchanger rating using Kern's method. The content is strictly academic with no reference to industrial best practices.
This design project aims to propose a plate type heat exchanger that can meet given heat duty and find the number of plates required. Plate type heat exchanger uses metal plates to transfer heat between two fluids. Starting point of this design is to define given properties
technoloTwo dimensional numerical simulation of the combined heat transfer in...ijmech
A numerical investigation was conducted to analyze the flow field and heat transfer characteristics in a vertical channel withradiation and blowing from the wall. Hydrodynamic behaviour and heat transfer results are obtained by the solution of the complete Navier–Stokesand energy equations using a control volume finite element method. Turbulent flow with "Low Reynolds Spalart-Allmaras Turbulence Model" and radiation with "Discrete Transfer Radiation Method" had been modeled. In order to have a complete survey, this article has a wide range of study in different domains including velocity profiles at different locations, turbulent viscosity, shear stress, suctioned mass flow rate in different magnitude of the input
Rayleigh number, blowing Reynoldsnumber, radiation parameter, Prandtl number, the ratio of length to width and also ratio of opening thickness to width of the channel. In addition, effects of variation in any of the above non-dimensional numbers on parameters of the flow are clearly illustrated. At the end resultants had been compared with experimental data which demonstrated that in the present study, results have a great accuracy, relative errors are very small and the curve portraits are in a great
agreement with real experiments.
This document summarizes an experimental investigation into the effects of trailing edge discharge cooling on the film cooling effectiveness of a turbine nozzle guide vane endwall. The study uses pressure sensitive paint to measure film cooling effectiveness on an endwall downstream of turbine blade trailing edges with discharge holes at compound angles. It examines the interaction between coolant from the endwall and trailing edge, referred to as "phantom cooling", and how blowing ratio and compound angle configuration affect film cooling performance. The experiments were conducted on a scale model turbine nozzle guide vane cascade with Reynolds number of 3.5×105 and inlet Mach number of 0.1 while varying the blowing ratio from 0.7 to 1.3 and compound angle of the trailing edge holes.
O documento é uma edição da coluna "Coluna Gamer" que fornece resumos e dicas sobre jogos. A coluna discute o jogo de luta "Rival Schools" da Capcom, o MMORPG de ação "BladeCraft", e o jogo de luta para Sega Saturn "A Mega Mistura de Lutadores" que reunia personagens de vários jogos da Sega.
Turbinas aeronáuticas geram empuxo para acelerar aviões, são usadas em aeronaves militares, executivas e agrícolas, e funcionam comprimindo ar, misturando com combustível, passando pela turbina e saindo em alta velocidade. Existem três principais tipos: turbojatos, turboélices e turbofans, sendo os turbofans os mais modernos e eficientes.
O documento discute máquinas térmicas e como elas transformam energia de uma forma para outra. Exemplos incluem usinas termelétricas que transformam energia química em energia elétrica através de caldeiras, turbinas e geradores, e motores a vapor e de combustão interna que transformam energia térmica em energia mecânica para mover veículos. O documento também explica como geladeiras funcionam transferindo calor do interior para o exterior.
The results show that, with proper selection of physical parameters, significant heat transfer
enhancements and pressure drop reductions can be achieved simultaneously with porous pin fins and
the overall heat transfer performances in porous pin fin channels are much better than those in
traditional solid pin fin channels. The effects of pore density are significant. As PPI increases, the
pressure drops and heat fluxes in porous pin fin channels increase while the overall heat transfer
efficiencies decrease and the maximal overall heat transfer efficiencies are obtained at PPI 20.
Furthermore, the effects of pin fin form are also remarkable. With the same physical parameters, the
overall heat transfer efficiencies in the long elliptic porous pin fin channels are the highest while they
are the lowest in the short elliptic porous pin fin channels
IRJET- Study of Jet Impingement Heat TransferIRJET Journal
This document reviews research on jet impingement heat transfer. It discusses the flow and heat transfer characteristics of single and multiple impinging jets. Key factors that influence heat transfer are jet Reynolds number, nozzle-to-plate spacing, jet pattern, and crossflow. The document summarizes various empirical correlations that have been developed to predict average heat transfer coefficients. It also reviews numerical studies on modeling heat transfer for multi-jet systems and discusses the effects of parameters like Reynolds number, nozzle spacing, crossflow, and jet interference.
The document summarizes previous research on natural convection heat transfer through inclined parallel plates. It reviews several studies that have experimentally investigated the effects of plate inclination angle and spacing on heat transfer rate. The studies found that plate inclination can both increase and decrease heat transfer compared to vertical plates, depending on whether the plate is heated from below or above. They also observed that natural convection heat transfer depends on factors like Rayleigh number, Nusselt number, and the aspect ratio of plate spacing to length. The document concludes there remains scope for further research to develop more accurate correlations for modeling buoyancy-driven mass and heat transfer through inclined parallel plates.
Prediction of friction factor and non dimensions numbers in force convectionIAEME Publication
This document summarizes an experimental study on heat transfer in an insulated cylindrical pipe. The study measured parameters like Nusselt number, Reynolds number, and frictional factor under different flow conditions. Experiments were conducted with air flow through a 40mm diameter pipe with 5mm insulation. Measurements were taken for 1/3, 2/3, and full opening of a control valve, and results were validated against analytical calculations using common heat transfer equations. Experimental values matched well with theoretical predictions.
An experimental study of heat transfer in a corrugated plate heat exchangerIAEME Publication
1. The document discusses an experimental study of heat transfer in a corrugated plate heat exchanger. Experiments were conducted to analyze heat transfer characteristics for different flow arrangements of hot and cold fluids through the heat exchanger.
2. The effectiveness and exergy loss of the heat exchanger were calculated for parallel and counter flow arrangements. The average effectiveness was found to be 48% higher and exergy loss 33% lower in the counter flow arrangement compared to the parallel flow arrangement.
3. Maximum heat transfer was observed at the highest hot fluid inlet temperature of 70°C, being 5% greater in the parallel flow arrangement. However, the non-dimensional exergy loss and log mean temperature difference were both lower in the
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Mixed convection heat transfer in inclined tubes with constant heat flux, eur...Ahmed Al-Sammarraie
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Mixed convection heat transferin inclined tubes with constant heat fluxOzyegin University
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Design of heat transfer surfaces in agitated vesselsArcangelo Di Tano
This document discusses heat transfer surfaces used in agitated vessels. It presents three main types of heat transfer surfaces: jackets, helical coils, and spiral coils. Vertical tube baffles are also discussed. The overall heat transfer coefficient is determined based on convection mechanisms and is used to calculate the necessary heat exchange area. A numerical example is provided to calculate the heat transfer area for an agitated vessel using vertical tube baffles and a pitched blade turbine. The same calculation is done for a radial impeller turbine to compare heat transfer efficiencies.
IRJET- Investigation of Fluid Flow Characteristics for the Forced Convect...IRJET Journal
This document summarizes a study that used computational fluid dynamics (CFD) to investigate fluid flow characteristics over heated elliptical and circular shaped tubes. The study varied the Reynolds number from 438 to 1227 and found that elliptical tubes had lower pressure drop and friction factor values than circular tubes. Velocity distributions showed smaller wakes behind elliptical tubes. Pressure drop and friction factor both increased with Reynolds number but elliptical tubes performed better in both areas. The study concluded elliptical tubes provided better heat transfer characteristics than circular tubes of the same hydraulic diameter.
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.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
The document summarizes an experimental study comparing the performance of a helical coil heat exchanger to a straight tube heat exchanger. Researchers designed, fabricated, and tested both types of heat exchangers. Results showed that the helical coil design had higher heat transfer rates, effectiveness, and overall heat transfer coefficients than the straight tube design across all flow rates and operating conditions. This is because the coiled tube shape induces secondary fluid flows that enhance mixing and heat transfer compared to the straight tube. The study concludes that helical coil heat exchangers have better performance than straight tube designs for industrial heat exchange applications.
Evaluation of thermal performance of a typical vapor compression refrigeratio...Saif al-din ali
This document describes an experiment conducted to evaluate the thermal performance of a typical vapor compression refrigeration cycle. The objectives were to learn about the components and analyze the cycle. Readings were taken of various temperatures and pressures. Calculations were done to determine compressor work, refrigeration effect, and coefficient of performance. Questions were asked about how to increase COP, the influence of temperatures, detecting refrigerant leaks, processes in the condenser, and functions of cycle components.
Design and analysis of plate heat exchanger with co2 and r134a as working fIAEME Publication
This document describes the design and analysis of a plate heat exchanger using CO2 and R134a as working fluids. The authors modeled the plate heat exchanger in Solidworks and analyzed it using computational fluid dynamics in ANSYS. They calculated the heat transfer coefficients, Nusselt number, Reynolds number, and overall heat transfer coefficient. The results from the CFD analysis matched closely with the theoretical calculations. The analysis showed a low pressure drop and the optimal design achieved a small temperature difference between the inlet and outlet of both fluids.
Experimental Analysis Of Heat Transfer From Square Perforated Fins In Stagger...IJERA Editor
This project gives the experimental analysis of heat transfer over a flat surface equipped with Square perforated
pin fins in staggered arrangement in a rectangular channel. The Fin dimensions are 100mm in height & 25mm in
width. The range of Reynolds number is fixed & about 13,500– 42,000, the clearance ratio (C/H) 0, 0.33 and 1,
the inter-fin spacing ratio (Sy /D) 1.208, 1.524, 1.944 and 3.417. Sy i.e. stream wise distance is varies and Sx i.e.
span wise distance is constant. The friction factor, enhancement efficiency and heat transfer correlate in
equations with each other. Here we are comparing Square pin fins with cylindrical pin fins. Staggered
arrangement and perforation will enhance the heat transfer rate. Clearance ratio and inter-fin spacing ratio affect
on Enhancement efficiency. Both lower clearance ratio and lower inter-fin spacing ratio and comparatively lower
Reynolds number give higher thermal performance. Friction factor & Nusselt number are Key parameter which
relates with efficiency enhancement and heat transfer rate.
Shell & tube heat exchanger single fluid flow heat transferVikram Sharma
This article was produced to highlight the fundamentals of single-phase heat exchanger rating using Kern's method. The content is strictly academic with no reference to industrial best practices.
This design project aims to propose a plate type heat exchanger that can meet given heat duty and find the number of plates required. Plate type heat exchanger uses metal plates to transfer heat between two fluids. Starting point of this design is to define given properties
technoloTwo dimensional numerical simulation of the combined heat transfer in...ijmech
A numerical investigation was conducted to analyze the flow field and heat transfer characteristics in a vertical channel withradiation and blowing from the wall. Hydrodynamic behaviour and heat transfer results are obtained by the solution of the complete Navier–Stokesand energy equations using a control volume finite element method. Turbulent flow with "Low Reynolds Spalart-Allmaras Turbulence Model" and radiation with "Discrete Transfer Radiation Method" had been modeled. In order to have a complete survey, this article has a wide range of study in different domains including velocity profiles at different locations, turbulent viscosity, shear stress, suctioned mass flow rate in different magnitude of the input
Rayleigh number, blowing Reynoldsnumber, radiation parameter, Prandtl number, the ratio of length to width and also ratio of opening thickness to width of the channel. In addition, effects of variation in any of the above non-dimensional numbers on parameters of the flow are clearly illustrated. At the end resultants had been compared with experimental data which demonstrated that in the present study, results have a great accuracy, relative errors are very small and the curve portraits are in a great
agreement with real experiments.
This document summarizes an experimental investigation into the effects of trailing edge discharge cooling on the film cooling effectiveness of a turbine nozzle guide vane endwall. The study uses pressure sensitive paint to measure film cooling effectiveness on an endwall downstream of turbine blade trailing edges with discharge holes at compound angles. It examines the interaction between coolant from the endwall and trailing edge, referred to as "phantom cooling", and how blowing ratio and compound angle configuration affect film cooling performance. The experiments were conducted on a scale model turbine nozzle guide vane cascade with Reynolds number of 3.5×105 and inlet Mach number of 0.1 while varying the blowing ratio from 0.7 to 1.3 and compound angle of the trailing edge holes.
O documento é uma edição da coluna "Coluna Gamer" que fornece resumos e dicas sobre jogos. A coluna discute o jogo de luta "Rival Schools" da Capcom, o MMORPG de ação "BladeCraft", e o jogo de luta para Sega Saturn "A Mega Mistura de Lutadores" que reunia personagens de vários jogos da Sega.
Turbinas aeronáuticas geram empuxo para acelerar aviões, são usadas em aeronaves militares, executivas e agrícolas, e funcionam comprimindo ar, misturando com combustível, passando pela turbina e saindo em alta velocidade. Existem três principais tipos: turbojatos, turboélices e turbofans, sendo os turbofans os mais modernos e eficientes.
O documento discute máquinas térmicas e como elas transformam energia de uma forma para outra. Exemplos incluem usinas termelétricas que transformam energia química em energia elétrica através de caldeiras, turbinas e geradores, e motores a vapor e de combustão interna que transformam energia térmica em energia mecânica para mover veículos. O documento também explica como geladeiras funcionam transferindo calor do interior para o exterior.
Este documento é uma apostila sobre introdução à prática do desenho destinada a estudantes de design de moda. A apostila explica os materiais básicos de desenho, como diferentes tipos de papel, e destaca que a linha, superfície, volume, luz e cor são os cinco elementos visuais fundamentais do desenho.
O documento fornece instruções sobre a pronúncia do alfabeto em inglês, incluindo:
1) A tabela que mostra a pronúncia de cada letra do alfabeto;
2) Exemplos de palavras que ilustram as regras de pronúncia, como a diferença entre "life" e "like";
3) Dicas sobre a pronúncia de vogais como I, A e E em diferentes contextos fonéticos.
Combustion and Mixing Analysis of a Scramjet Combustor Using CFDijsrd.com
This document summarizes a computational fluid dynamics (CFD) study of combustion and mixing in a scramjet combustor. The study uses ANSYS Fluent software to model flow inside a scramjet combustor geometry for hydrogen, diesel, and methane fuels. The objectives are to determine the flow field and maximize thrust at a Mach number of 2. Key findings include that combustion increases recirculation behind the flameholder strut compared to mixing alone, and shockwaves from the strut facilitate combustion ignition in regions with fuel-air mixing. Meshing of the combustor geometry and strut are discussed.
This document provides information about how gas turbine engines work and their applications. It first describes the basic components and process of a simple cycle gas turbine, which involves compression, combustion, and expansion stages. It then discusses the key components in more detail, including axial compressors and turbines, and different combustor designs. The document outlines common performance characteristics like efficiency variations with load and ambient temperature. Finally, it lists some common industrial and power generation applications for gas turbines and how they are used for base load, peak load, and standby operations.
Kaveri engine has 7 components, these components are Low Pressure and High Pressure Compressors, Annular Combustor, High Pressure and Low Pressure Turbines, Afterburner System, Engine Gearbox, Electro-Hydro Mechanical Control Systems, Kaveri Digital Engine Control Unit.
The document discusses CFD analysis of a gas turbine combustor. It aims to optimize the diameter, position, and number of dilution holes in a can-type combustor. A 3D model was created using ANSYS CFX software. Simulations were performed with methane gas, varying the dilution hole parameters. The optimized design was found to have 5 holes of 30mm diameter in each of two rows arranged in a zigzag pattern. This provided the lowest combustor exit temperature. A structural analysis of the optimized model showed it was structurally stable with a safety factor of 2.95.
Flame stability is important for low-NOx combustion systems. Factors that influence flame stability include flame propagation speed, mixing timescales, residence time, and the balance between flow and flame velocities. Various stabilization methods are used, such as bluff bodies, swirl arrangements, and turbulent jets to create recirculation zones or low velocity regions for flame anchoring. Exhaust gas recirculation and other techniques can also enhance flame stability. Industrial burners use different fuel gases and configurations like flat burners, baffle burners, and staged air burners. Safety controls and monitoring are vital for safe burner operation.
This document describes a master's thesis that models a generic gas turbine combustor using computational fluid dynamics (CFD). The student aims to create a simple yet accurate CFD model that yields reliable results in a short time. The thesis evaluates different turbulence models, heat transfer models, and performs grid sensitivity studies using a generic combustor geometry. The results are discussed to determine the most numerically reliable and efficient model.
Kale Chane ke Fayde: Swasthvardhak Guno Se Bharpurcshradhha
kala chana hame madhumeh, nimn raktchap aur kabj aadi se judi samasyao se bachane mai madad karta hai. Yaha padhe aur bhi Kale Chane ke Fayde aur rahe swasth. Aur adhik jane: http://hrelate.com/kale-chane-ke-fayde/
The document summarizes the key components and working principles of jet engines. It describes the basic components as the inlet, compressor, combustor, turbine, and nozzle. It explains that air is compressed, mixed with fuel and burned, passing through a turbine to drive the compressor before being expelled through a nozzle for thrust. It also categorizes different types of jet engines such as turbojets, turbofans, rockets, ramjets, and others.
A 1a lei de Newton estabelece que um objeto permanece em repouso ou movimento uniforme a menos que uma força externa atue sobre ele. A 2a lei relaciona a força aplicada à massa e aceleração de um objeto. A 3a lei estabelece que para toda ação existe uma reação igual e oposta.
O documento descreve os principais componentes e diferenças entre um ciclo com turbina a vapor e um ciclo com turbina a gás. O ciclo com turbina a vapor usa uma bomba de alimentação, caldeira e turbina a vapor, enquanto o ciclo com turbina a gás usa um compressor, combustor e turbina a gás.
This document outlines a 10-day lesson plan using spoken word poetry in a high school classroom. The plan aims to help students conduct self-reflection and character analysis, interpret artistic works, create and analyze text for performance, and respond intelligently to others' work. It begins with students creating "Personal Museums" by selecting meaningful artifacts and creating a video exhibit. Students then analyze themes in their lives and write slam poetry exploring a "thought" they want to convey. The plan involves workshopping poems multiple times and performing them for feedback, with a focus on discovery, community-building, and performance techniques.
The document certifies that Olajide Segun served as a 4th Engineer on the vessel MT Bekkie from December 7, 2018 to May 15, 2014, and that he received satisfactory performance reviews and remained strictly sober during his service. It also confirms that Olajide completed his national diploma in boat/ship building technology and passed his medical examination to serve as a seafarer.
Raman is introduced as the official photographer of J-mid. Typical scenes at J-mid are described including Raman discussing agriculture in Bihar with GG, Makkhi thinking of shayaris, BT Baba trying to expand his Bluetooth range, and Karthikeyan on his phone. After two hours of a party in Section-D, Salim is seen with cheap liquor that went to people's heads quickly. Raman is seen eating jamun fruit provided by Verma after his internship, with Verma saying he only saw jamun during his internship and couldn't taste it. Different photos of Raman are shown in various poses and styles. Raman is wished a happy birthday by J-Mid.
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 summarizes an experimental investigation into the effect of turbine phantom cooling on the suction side of a nozzle guide vane. Phantom cooling refers to coolant injected from the endwall that moves toward the airfoil suction side, providing a secondary cooling effect. The study uses pressure sensitive paint to measure film cooling effectiveness on a scale model turbine vane under different blowing ratios and incidence angles. It finds that incidence angle can alter the direction of coolant jets on the pressure side and change film cooling effectiveness distributions on the airfoil suction side.
The document describes a computational fluid dynamics (CFD) analysis of heat transfer in a rectangular channel with blockages containing elongated holes. A model of the channel was created in design software and meshed before performing CFD simulations. The simulations analyzed how heat transfer coefficients and Nusselt numbers varied with the pitch ratio of the blockages for different Reynolds numbers. Results showed that heat transfer initially increased with pitch ratio up to a value of 6.0, then decreased with further increases, due to changes in flow reattachment. Blockages with shorter holes enhanced heat transfer more but also increased pressure drops more compared to longer holes. The CFD results were also validated against available experimental data, with good agreement.
IRJET- Numerical Investigation of Heat Transfer Enhancement in Circular Pipe ...IRJET Journal
1. The document numerically investigates heat transfer enhancement in a circular pipe with various rib geometries, including flat, conical, and right angle ribs.
2. It uses computational fluid dynamics to model water flow through the pipe with Reynolds numbers from 5000 to 60000 and a constant heat flux of 50 W/cm2 applied to the pipe surface.
3. The results show that ribs on the inside of the pipe enhance turbulence in the flow and produce recirculation, disturbing the thermal boundary layer and increasing the rate of heat transfer through the pipe.
IRJET- A Reviw on Different Geometrical Fins and their Effect on Heat Tra...IRJET Journal
This document summarizes research on different geometric fin designs and their effect on heat transfer rates. It discusses how fins are used to increase surface area and improve heat transfer. Various fin geometries are described including longitudinal, radial, and pin fins. The performance of fins is evaluated using metrics like fin effectiveness and efficiency. Higher thermal conductivity materials, thinner fins with closer spacing, and conditions with lower heat transfer coefficients can improve fin performance. The document reviews several studies on topics like annular fins, dimpled pin fins, and modeling transient heat transfer in piston bore fins.
Analysis of Heat Generation in Double Pipe Heat Exchanger: An Experimental Ev...IRJET Journal
This document summarizes research on analyzing heat generation in a double pipe heat exchanger with an elliptical fin surface contact. An experiment was conducted to compare the heat transfer rate of an elliptical fin to other fin types (tube-tube, rectangular, annular, spiral rod). The results showed the elliptical fin had a higher heat transfer rate. The document reviews several other studies analyzing different fin geometries, heat transfer optimization techniques, and computational fluid dynamics simulations of heat exchangers. It provides background on analyzing heat exchangers using methods like logarithmic mean temperature difference and effectiveness-NTU and discusses prior work optimizing dimensions, materials, and flow conditions to improve heat transfer performance.
This document discusses numerical simulation of a thermoacoustic engine (TAE). It begins by providing background on TAEs and previous simulation work. It then describes the methodology used, which involves CFD simulation of a standing wave TAE with a stack of horizontal plates as the regenerator. The study assesses pressure wave development and analyzes the sensitivity to temperature gradient at the stack and resonator length. Preliminary results show higher temperature gradients produce higher pressure amplitudes and earlier wave development, while medium resonator lengths provide both high amplitude and faster initiation compared to very short or long lengths.
HEAT TRANSFER AUGMENTATION IN A PLATE-FIN HEAT EXCHANGER: A REVIEWIAEME Publication
The improvement of the performance of heat exchangers with gas as the working fluid becomes particularly important due to the high thermal resistance offered by gases in general. In order to compensate for the poor heat transfer properties of gases, the surface area density of plate heat exchangers can be increased by making use of the secondary fins such as, off-set fins, triangular fins, wavy fins, louvered fins etc. In addition, a promising technique for the enhancement of heat transfer is the use of longitudinal vortex generators. The longitudinal vortices are produced due to the pressure difference generated between the front and back surface of the vortex generator.
Numerical Analysis of Inverted Notched Fin Array Using Natural ConvectionIOSR Journals
Abstract:Geometry and orientation plays an important role in natural convection heat transfer. For
horizontal rectangular fin array a chimney flow pattern is developed due to density difference. This flow
pattern creates a stagnant zone near central bottom region. That portion does not contribute much towards
heat dissipation. This area is removed from fins and they became inverted notched fins. This modified geometry
reduces material cost, material weight without hampering heat transfer rate. Numerical models are prepaid to
investigate heat transfer characteristics in plane fins and inverted notched fins. This investigation is also
extended over different types of notches and their effectiveness comparison. Fin spacing, fin height, fin length,
heater input, percentage of area removed in the form of inverted notch are the parameters under
consideration. This analysis is done numerically using CFD package (Fluent). It is found that the heat transfer
coefficient of inverted notch fin array is 25% to 35% higher as compared with normal fin array. Also we found
that the triangular shape notch gives better result than trapezoidal and rectangular shape notch.
Key words: Inverted Notched Fin, Chimney Flow, Natural Convection, Heat transfer coefficient enhancement
In compact heat exchangers, thermal resistance is generally dominant on the air-side and may
account for 80% or more of the total thermal resistance. The air-side heat transfer surface area is 8 to
10 times larger than the water-side. Any improvement in the heat transfer on air-side therefore
improves the overall performance of the heat exchanger. Due to the high thermal resistance on the
air-side, the optimization of such fins is essential to increase the performance of the heat exchangers
which results in thermal systems enhancement. This helps to reduce CO2 emissions through a
reduction of mass and fuel consumption.
Optimization of louvered fin geometry in such heat exchangers is essential to increase the
heat transfer performance and reduce weight, packaging, and cost requirements. In this study deals
with Computational Fluid Dynamics (CFD) studies of the interactions between the air flow and
louvered fins which equipped the automotive heat exchangers is carried out. 3D numerical
simulation results is obtained by using the ANSYS Fluent 14.0 code and compared with
experimental data. Finally the effect of louver angle and louver pitch geometrical parameters, on
overall thermal hydraulic performances of louvered fins is studied.
This document discusses a numerical investigation of the geometry of louvered fins in automotive radiator compact heat exchangers. Computational fluid dynamics simulations were performed using ANSYS Fluent to analyze the interactions between air flow and louvered fins. The effects of louver angle and pitch on thermal hydraulic performance were studied. The results were compared to experimental data to validate the simulations. Optimization of louvered fin geometry can increase heat transfer performance while reducing weight and cost requirements.
A REPORT ON HEAT TRANSFER OPTIMIZATION OFSHELL AND TUBE HEAT EXCHANGER USING ...IRJET Journal
The document presents a study on optimizing heat transfer in a shell and tube heat exchanger using different fluids through computational fluid dynamics (CFD) analysis. A shell and tube heat exchanger model was created in CATIA software and CFD analysis was performed in Solidworks Flow Simulation. Water and two types of nanofluids (SiO2 and Al2O3 nanoparticles mixed with water) were analyzed as fluids flowing through the heat exchanger tubes at varying velocities from 0.2 m/s to 1 m/s. The results found that increasing fluid velocity improved heat transfer effectiveness and overall heat transfer while decreasing friction factor. Heat transfer performance was highest for the nanofluids compared to water alone.
1) The document discusses a study evaluating a new turbine nozzle guide vane design with radial cylindrical cooling holes on the pressure side to improve film cooling effectiveness in a cooling blind area near the pressure side gill region.
2) Experiments were conducted on a scaled nozzle guide vane cascade model with four rows of radial cooling holes at various blowing ratios. Pressure sensitive painting was used to measure film cooling effectiveness.
3) The results showed that film cooling effectiveness near the pressure side gill region increased with the new design, with a double-peak cooled region developing towards the suction side at higher blowing ratios. Pressure side radial cooling holes improved film cooling in the gill region but effectiveness decreased along the axial chord at low
This document summarizes a study that uses computational fluid dynamics (CFD) to analyze the flow and heat transfer characteristics of different elliptical pin fin heat sink configurations. The study aims to examine the effects of elliptical pin fin design parameters on heat sink performance. CFD simulations are conducted using ANSYS Fluent software to compute the thermal resistance, heat transfer coefficient, and surface Nusselt number of plate fin and elliptical pin fin heat sinks. Results show that the elliptical pin fin heat sink has better heat transfer performance than the plate fin heat sink. Simulation results for thermal resistance and pressure drop are validated against experimental data from previous studies.
Computational Fluid Dynamic Analysis for Optimization of Helical Coil Heat Ex...IRJET Journal
This document analyzes computational fluid dynamic (CFD) optimization of a helical coil heat exchanger. It compares CFD analysis results to experimental results and finds that decreasing the pitch length of the helical coil and relative velocity of fluids increases heat transfer rate. The document also describes an experimental setup used to study a helical coil heat exchanger and discusses previous research analyzing factors that affect heat transfer in helical coil exchangers, such as pitch length, tube diameter, and fluid velocity.
NUMERICAL ANALYSIS OF THERMAL PERFORMANCE OF LOUVER FINijiert bestjournal
Louver fins are widely used in heat exchanger for a utomotive applications such as radiator,intercooler,condenser,heater core etc. This study presents numerical analysis of effect of variation of louver pitch on heat transfer rate of louver fins. The three dimensional governing equations for fluid flow and heat transfe r are solved using ANSYS Fluent 14.5 for air flow of 4 m/s to 9 m/s. The variations of t emperature,pressure and heat transfer rate are studied using computational model. The enhancem ent of heat rate is observed as louver pitch is reduced.
NUMERICAL SIMULATION OF FORCED CONVECTION HEAT TRANSFER ENHANCEMENT BY POROUS...IAEME Publication
Pin fins have a variety of applications in industry due to their excellent heat transfer performance, e.g., in cooling of electronic components, in cooling of gas turbine blades, and
recently, in hot water boilers of central heating systems. The forced convective heat transfer in three dimensional porous pin fin channels is numerically studied using ANSYS Fluent. Geometric modelling is done using Design Modeller and CFD Meshing is carried out using ANSYS Meshing Preprocessor. The effects of Reynolds number (Re), pore density (PPI) and pin fin form are studied in detail.
Numerical Analysis of Header Configuration of the Plate-Fin Heat ExchangerIJMER
Numerical analysis of a plate fin heat exchanger accounting for the effect of fluid flow
maldistribution onthe inlet header configuration of the heat exchanger is investigated. In this analysis , it
was found that flow maldistribution has effect on the flow perpendicular to its velocity direction. The peak
velocity occurs in the central zone of the header while the velocityalong the perpendicular direction of the
inlet flow diminishes more and more. By this investigation,the results of the flow maldistribution are
presented for a plate fin heat exchangerwhich is reduced as compare to theexisting configuration of the
plate fin heat exchanger.
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.
This document summarizes a study on magnetohydrodynamic (MHD) boundary layer flow of a Maxwell fluid past a porous stretching sheet with viscous dissipation. The study investigates the effects of various parameters on heat transfer for two cases: (1) a surface with prescribed wall temperature (PST), and (2) a surface with prescribed wall heat flux (PHF). Governing partial differential equations for momentum and heat transfer are converted to ordinary differential equations using similarity transformations. Numerical solutions are obtained using a shooting technique with a fourth-order Runge-Kutta scheme. Results for different dimensionless parameters are presented graphically for both PST and PHF cases and discussed.
Similar to Cfd analysis of turbulence in a gas turbine combustor with reference to the context (20)
Submission Deadline: 30th September 2022
Acceptance Notification: Within Three Days’ time period
Online Publication: Within 24 Hrs. time Period
Expected Date of Dispatch of Printed Journal: 5th October 2022
MODELING AND ANALYSIS OF SURFACE ROUGHNESS AND WHITE LATER THICKNESS IN WIRE-...IAEME Publication
White layer thickness (WLT) formed and surface roughness in wire electric discharge turning (WEDT) of tungsten carbide composite has been made to model through response surface methodology (RSM). A Taguchi’s standard Design of experiments involving five input variables with three levels has been employed to establish a mathematical model between input parameters and responses. Percentage of cobalt content, spindle speed, Pulse on-time, wire feed and pulse off-time were changed during the experimental tests based on the Taguchi’s orthogonal array L27 (3^13). Analysis of variance (ANOVA) revealed that the mathematical models obtained can adequately describe performance within the parameters of the factors considered. There was a good agreement between the experimental and predicted values in this study.
A STUDY ON THE REASONS FOR TRANSGENDER TO BECOME ENTREPRENEURSIAEME Publication
The study explores the reasons for a transgender to become entrepreneurs. In this study transgender entrepreneur was taken as independent variable and reasons to become as dependent variable. Data were collected through a structured questionnaire containing a five point Likert Scale. The study examined the data of 30 transgender entrepreneurs in Salem Municipal Corporation of Tamil Nadu State, India. Simple Random sampling technique was used. Garrett Ranking Technique (Percentile Position, Mean Scores) was used as the analysis for the present study to identify the top 13 stimulus factors for establishment of trans entrepreneurial venture. Economic advancement of a nation is governed upon the upshot of a resolute entrepreneurial doings. The conception of entrepreneurship has stretched and materialized to the socially deflated uncharted sections of transgender community. Presently transgenders have smashed their stereotypes and are making recent headlines of achievements in various fields of our Indian society. The trans-community is gradually being observed in a new light and has been trying to achieve prospective growth in entrepreneurship. The findings of the research revealed that the optimistic changes are taking place to change affirmative societal outlook of the transgender for entrepreneurial ventureship. It also laid emphasis on other transgenders to renovate their traditional living. The paper also highlights that legislators, supervisory body should endorse an impartial canons and reforms in Tamil Nadu Transgender Welfare Board Association.
BROAD UNEXPOSED SKILLS OF TRANSGENDER ENTREPRENEURSIAEME Publication
Since ages gender difference is always a debatable theme whether caused by nature, evolution or environment. The birth of a transgender is dreadful not only for the child but also for their parents. The pain of living in the wrong physique and treated as second class victimized citizen is outrageous and fully harboured with vicious baseless negative scruples. For so long, social exclusion had perpetuated inequality and deprivation experiencing ingrained malign stigma and besieged victims of crime or violence across their life spans. They are pushed into the murky way of life with a source of eternal disgust, bereft sexual potency and perennial fear. Although they are highly visible but very little is known about them. The common public needs to comprehend the ravaged arrogance on these insensitive souls and assist in integrating them into the mainstream by offering equal opportunity, treat with humanity and respect their dignity. Entrepreneurship in the current age is endorsing the gender fairness movement. Unstable careers and economic inadequacy had inclined one of the gender variant people called Transgender to become entrepreneurs. These tiny budding entrepreneurs resulted in economic transition by means of employment, free from the clutches of stereotype jobs, raised standard of living and handful of financial empowerment. Besides all these inhibitions, they were able to witness a platform for skill set development that ignited them to enter into entrepreneurial domain. This paper epitomizes skill sets involved in trans-entrepreneurs of Thoothukudi Municipal Corporation of Tamil Nadu State and is a groundbreaking determination to sightsee various skills incorporated and the impact on entrepreneurship.
DETERMINANTS AFFECTING THE USER'S INTENTION TO USE MOBILE BANKING APPLICATIONSIAEME Publication
The banking and financial services industries are experiencing increased technology penetration. Among them, the banking industry has made technological advancements to better serve the general populace. The economy focused on transforming the banking sector's system into a cashless, paperless, and faceless one. The researcher wants to evaluate the user's intention for utilising a mobile banking application. The study also examines the variables affecting the user's behaviour intention when selecting specific applications for financial transactions. The researcher employed a well-structured questionnaire and a descriptive study methodology to gather the respondents' primary data utilising the snowball sampling technique. The study includes variables like performance expectations, effort expectations, social impact, enabling circumstances, and perceived risk. Each of the aforementioned variables has a major impact on how users utilise mobile banking applications. The outcome will assist the service provider in comprehending the user's history with mobile banking applications.
ANALYSE THE USER PREDILECTION ON GPAY AND PHONEPE FOR DIGITAL TRANSACTIONSIAEME Publication
Technology upgradation in banking sector took the economy to view that payment mode towards online transactions using mobile applications. This system enabled connectivity between banks, Merchant and user in a convenient mode. there are various applications used for online transactions such as Google pay, Paytm, freecharge, mobikiwi, oxygen, phonepe and so on and it also includes mobile banking applications. The study aimed at evaluating the predilection of the user in adopting digital transaction. The study is descriptive in nature. The researcher used random sample techniques to collect the data. The findings reveal that mobile applications differ with the quality of service rendered by Gpay and Phonepe. The researcher suggest the Phonepe application should focus on implementing the application should be user friendly interface and Gpay on motivating the users to feel the importance of request for money and modes of payments in the application.
VOICE BASED ATM FOR VISUALLY IMPAIRED USING ARDUINOIAEME Publication
The prototype of a voice-based ATM for visually impaired using Arduino is to help people who are blind. This uses RFID cards which contain users fingerprint encrypted on it and interacts with the users through voice commands. ATM operates when sensor detects the presence of one person in the cabin. After scanning the RFID card, it will ask to select the mode like –normal or blind. User can select the respective mode through voice input, if blind mode is selected the balance check or cash withdraw can be done through voice input. Normal mode procedure is same as the existing ATM.
IMPACT OF EMOTIONAL INTELLIGENCE ON HUMAN RESOURCE MANAGEMENT PRACTICES AMONG...IAEME Publication
There is increasing acceptability of emotional intelligence as a major factor in personality assessment and effective human resource management. Emotional intelligence as the ability to build capacity, empathize, co-operate, motivate and develop others cannot be divorced from both effective performance and human resource management systems. The human person is crucial in defining organizational leadership and fortunes in terms of challenges and opportunities and walking across both multinational and bilateral relationships. The growing complexity of the business world requires a great deal of self-confidence, integrity, communication, conflict and diversity management to keep the global enterprise within the paths of productivity and sustainability. Using the exploratory research design and 255 participants the result of this original study indicates strong positive correlation between emotional intelligence and effective human resource management. The paper offers suggestions on further studies between emotional intelligence and human capital development and recommends for conflict management as an integral part of effective human resource management.
VISUALISING AGING PARENTS & THEIR CLOSE CARERS LIFE JOURNEY IN AGING ECONOMYIAEME Publication
Our life journey, in general, is closely defined by the way we understand the meaning of why we coexist and deal with its challenges. As we develop the "inspiration economy", we could say that nearly all of the challenges we have faced are opportunities that help us to discover the rest of our journey. In this note paper, we explore how being faced with the opportunity of being a close carer for an aging parent with dementia brought intangible discoveries that changed our insight of the meaning of the rest of our life journey.
A STUDY ON THE IMPACT OF ORGANIZATIONAL CULTURE ON THE EFFECTIVENESS OF PERFO...IAEME Publication
The main objective of this study is to analyze the impact of aspects of Organizational Culture on the Effectiveness of the Performance Management System (PMS) in the Health Care Organization at Thanjavur. Organizational Culture and PMS play a crucial role in present-day organizations in achieving their objectives. PMS needs employees’ cooperation to achieve its intended objectives. Employees' cooperation depends upon the organization’s culture. The present study uses exploratory research to examine the relationship between the Organization's culture and the Effectiveness of the Performance Management System. The study uses a Structured Questionnaire to collect the primary data. For this study, Thirty-six non-clinical employees were selected from twelve randomly selected Health Care organizations at Thanjavur. Thirty-two fully completed questionnaires were received.
Living in 21st century in itself reminds all of us the necessity of police and its administration. As more and more we are entering into the modern society and culture, the more we require the services of the so called ‘Khaki Worthy’ men i.e., the police personnel. Whether we talk of Indian police or the other nation’s police, they all have the same recognition as they have in India. But as already mentioned, their services and requirements are different after the like 26th November, 2008 incidents, where they without saving their own lives has sacrificed themselves without any hitch and without caring about their respective family members and wards. In other words, they are like our heroes and mentors who can guide us from the darkness of fear, militancy, corruption and other dark sides of life and so on. Now the question arises, if Gandhi would have been alive today, what would have been his reaction/opinion to the police and its functioning? Would he have some thing different in his mind now what he had been in his mind before the partition or would he be going to start some Satyagraha in the form of some improvement in the functioning of the police administration? Really these questions or rather night mares can come to any one’s mind, when there is too much confusion is prevailing in our minds, when there is too much corruption in the society and when the polices working is also in the questioning because of one or the other case throughout the India. It is matter of great concern that we have to thing over our administration and our practical approach because the police personals are also like us, they are part and parcel of our society and among one of us, so why we all are pin pointing towards them.
A STUDY ON TALENT MANAGEMENT AND ITS IMPACT ON EMPLOYEE RETENTION IN SELECTED...IAEME Publication
The goal of this study was to see how talent management affected employee retention in the selected IT organizations in Chennai. The fundamental issue was the difficulty to attract, hire, and retain talented personnel who perform well and the gap between supply and demand of talent acquisition and retaining them within the firms. The study's main goals were to determine the impact of talent management on employee retention in IT companies in Chennai, investigate talent management strategies that IT companies could use to improve talent acquisition, performance management, career planning and formulate retention strategies that the IT firms could use. The respondents were given a structured close-ended questionnaire with the 5 Point Likert Scale as part of the study's quantitative research design. The target population consisted of 289 IT professionals. The questionnaires were distributed and collected by the researcher directly. The Statistical Package for Social Sciences (SPSS) was used to collect and analyse the questionnaire responses. Hypotheses that were formulated for the various areas of the study were tested using a variety of statistical tests. The key findings of the study suggested that talent management had an impact on employee retention. The studies also found that there is a clear link between the implementation of talent management and retention measures. Management should provide enough training and development for employees, clarify job responsibilities, provide adequate remuneration packages, and recognise employees for exceptional performance.
ATTRITION IN THE IT INDUSTRY DURING COVID-19 PANDEMIC: LINKING EMOTIONAL INTE...IAEME Publication
Globally, Millions of dollars were spent by the organizations for employing skilled Information Technology (IT) professionals. It is costly to replace unskilled employees with IT professionals possessing technical skills and competencies that aid in interconnecting the business processes. The organization’s employment tactics were forced to alter by globalization along with technological innovations as they consistently diminish to remain lean, outsource to concentrate on core competencies along with restructuring/reallocate personnel to gather efficiency. As other jobs, organizations or professions have become reasonably more appropriate in a shifting employment landscape, the above alterations trigger both involuntary as well as voluntary turnover. The employee view on jobs is also afflicted by the COVID-19 pandemic along with the employee-driven labour market. So, having effective strategies is necessary to tackle the withdrawal rate of employees. By associating Emotional Intelligence (EI) along with Talent Management (TM) in the IT industry, the rise in attrition rate was analyzed in this study. Only 303 respondents were collected out of 350 participants to whom questionnaires were distributed. From the employees of IT organizations located in Bangalore (India), the data were congregated. A simple random sampling methodology was employed to congregate data as of the respondents. Generating the hypothesis along with testing is eventuated. The effect of EI and TM along with regression analysis between TM and EI was analyzed. The outcomes indicated that employee and Organizational Performance (OP) were elevated by effective EI along with TM.
INFLUENCE OF TALENT MANAGEMENT PRACTICES ON ORGANIZATIONAL PERFORMANCE A STUD...IAEME Publication
By implementing talent management strategy, organizations would have the option to retain their skilled professionals while additionally working on their overall performance. It is the course of appropriately utilizing the ideal individuals, setting them up for future top positions, exploring and dealing with their performance, and holding them back from leaving the organization. It is employee performance that determines the success of every organization. The firm quickly obtains an upper hand over its rivals in the event that its employees having particular skills that cannot be duplicated by the competitors. Thus, firms are centred on creating successful talent management practices and processes to deal with the unique human resources. Firms are additionally endeavouring to keep their top/key staff since on the off chance that they leave; the whole store of information leaves the firm's hands. The study's objective was to determine the impact of talent management on organizational performance among the selected IT organizations in Chennai. The study recommends that talent management limitedly affects performance. On the off chance that this talent is appropriately management and implemented properly, organizations might benefit as much as possible from their maintained assets to support development and productivity, both monetarily and non-monetarily.
A STUDY OF VARIOUS TYPES OF LOANS OF SELECTED PUBLIC AND PRIVATE SECTOR BANKS...IAEME Publication
Banking regulations act of India, 1949 defines banking as “acceptance of deposits for the purpose of lending or investment from the public, repayment on demand or otherwise and withdrawable through cheques, drafts order or otherwise”, the major participants of the Indian financial system are commercial banks, the financial institution encompassing term lending institutions. Investments institutions, specialized financial institution and the state level development banks, non banking financial companies (NBFC) and other market intermediaries such has the stock brokers and money lenders are among the oldest of the certain variants of NBFC and the oldest market participants. The asset quality of banks is one of the most important indicators of their financial health. The Indian banking sector has been facing severe problems of increasing Non- Performing Assets (NPAs). The NPAs growth directly and indirectly affects the quality of assets and profitability of banks. It also shows the efficiency of banks credit risk management and the recovery effectiveness. NPA do not generate any income, whereas, the bank is required to make provisions for such as assets that why is a double edge weapon. This paper outlines the concept of quality of bank loans of different types like Housing, Agriculture and MSME loans in state Haryana of selected public and private sector banks. This study is highlighting problems associated with the role of commercial bank in financing Small and Medium Scale Enterprises (SME). The overall objective of the research was to assess the effect of the financing provisions existing for the setting up and operations of MSMEs in the country and to generate recommendations for more robust financing mechanisms for successful operation of the MSMEs, in turn understanding the impact of MSME loans on financial institutions due to NPA. There are many research conducted on the topic of Non- Performing Assets (NPA) Management, concerning particular bank, comparative study of public and private banks etc. In this paper the researcher is considering the aggregate data of selected public sector and private sector banks and attempts to compare the NPA of Housing, Agriculture and MSME loans in state Haryana of public and private sector banks. The tools used in the study are average and Anova test and variance. The findings reveal that NPA is common problem for both public and private sector banks and is associated with all types of loans either that is housing loans, agriculture loans and loans to SMES. NPAs of both public and private sector banks show the increasing trend. In 2010-11 GNPA of public and private sector were at same level it was 2% but after 2010-11 it increased in many fold and at present there is GNPA in some more than 15%. It shows the dark area of Indian banking sector.
EXPERIMENTAL STUDY OF MECHANICAL AND TRIBOLOGICAL RELATION OF NYLON/BaSO4 POL...IAEME Publication
An experiment conducted in this study found that BaSO4 changed Nylon 6's mechanical properties. By changing the weight ratios, BaSO4 was used to make Nylon 6. This Researcher looked into how hard Nylon-6/BaSO4 composites are and how well they wear. Experiments were done based on Taguchi design L9. Nylon-6/BaSO4 composites can be tested for their hardness number using a Rockwell hardness testing apparatus. On Nylon/BaSO4, the wear behavior was measured by a wear monitor, pinon-disc friction by varying reinforcement, sliding speed, and sliding distance, and the microstructure of the crack surfaces was observed by SEM. This study provides significant contributions to ultimate strength by increasing BaSO4 content up to 16% in the composites, and sliding speed contributes 72.45% to the wear rate
ROLE OF SOCIAL ENTREPRENEURSHIP IN RURAL DEVELOPMENT OF INDIA - PROBLEMS AND ...IAEME Publication
The majority of the population in India lives in villages. The village is the back bone of the country. Village or rural industries play an important role in the national economy, particularly in the rural development. Developing the rural economy is one of the key indicators towards a country’s success. Whether it be the need to look after the welfare of the farmers or invest in rural infrastructure, Governments have to ensure that rural development isn’t compromised. The economic development of our country largely depends on the progress of rural areas and the standard of living of rural masses. Village or rural industries play an important role in the national economy, particularly in the rural development. Rural entrepreneurship is based on stimulating local entrepreneurial talent and the subsequent growth of indigenous enterprises. It recognizes opportunity in the rural areas and accelerates a unique blend of resources either inside or outside of agriculture. Rural entrepreneurship brings an economic value to the rural sector by creating new methods of production, new markets, new products and generate employment opportunities thereby ensuring continuous rural development. Social Entrepreneurship has the direct and primary objective of serving the society along with the earning profits. So, social entrepreneurship is different from the economic entrepreneurship as its basic objective is not to earn profits but for providing innovative solutions to meet the society needs which are not taken care by majority of the entrepreneurs as they are in the business for profit making as a sole objective. So, the Social Entrepreneurs have the huge growth potential particularly in the developing countries like India where we have huge societal disparities in terms of the financial positions of the population. Still 22 percent of the Indian population is below the poverty line and also there is disparity among the rural & urban population in terms of families living under BPL. 25.7 percent of the rural population & 13.7 percent of the urban population is under BPL which clearly shows the disparity of the poor people in the rural and urban areas. The need to develop social entrepreneurship in agriculture is dictated by a large number of social problems. Such problems include low living standards, unemployment, and social tension. The reasons that led to the emergence of the practice of social entrepreneurship are the above factors. The research problem lays upon disclosing the importance of role of social entrepreneurship in rural development of India. The paper the tendencies of social entrepreneurship in India, to present successful examples of such business for providing recommendations how to improve situation in rural areas in terms of social entrepreneurship development. Indian government has made some steps towards development of social enterprises, social entrepreneurship, and social in- novation, but a lot remains to be improved.
OPTIMAL RECONFIGURATION OF POWER DISTRIBUTION RADIAL NETWORK USING HYBRID MET...IAEME Publication
Distribution system is a critical link between the electric power distributor and the consumers. Most of the distribution networks commonly used by the electric utility is the radial distribution network. However in this type of network, it has technical issues such as enormous power losses which affect the quality of the supply. Nowadays, the introduction of Distributed Generation (DG) units in the system help improve and support the voltage profile of the network as well as the performance of the system components through power loss mitigation. In this study network reconfiguration was done using two meta-heuristic algorithms Particle Swarm Optimization and Gravitational Search Algorithm (PSO-GSA) to enhance power quality and voltage profile in the system when simultaneously applied with the DG units. Backward/Forward Sweep Method was used in the load flow analysis and simulated using the MATLAB program. Five cases were considered in the Reconfiguration based on the contribution of DG units. The proposed method was tested using IEEE 33 bus system. Based on the results, there was a voltage profile improvement in the system from 0.9038 p.u. to 0.9594 p.u.. The integration of DG in the network also reduced power losses from 210.98 kW to 69.3963 kW. Simulated results are drawn to show the performance of each case.
APPLICATION OF FRUGAL APPROACH FOR PRODUCTIVITY IMPROVEMENT - A CASE STUDY OF...IAEME Publication
Manufacturing industries have witnessed an outburst in productivity. For productivity improvement manufacturing industries are taking various initiatives by using lean tools and techniques. However, in different manufacturing industries, frugal approach is applied in product design and services as a tool for improvement. Frugal approach contributed to prove less is more and seems indirectly contributing to improve productivity. Hence, there is need to understand status of frugal approach application in manufacturing industries. All manufacturing industries are trying hard and putting continuous efforts for competitive existence. For productivity improvements, manufacturing industries are coming up with different effective and efficient solutions in manufacturing processes and operations. To overcome current challenges, manufacturing industries have started using frugal approach in product design and services. For this study, methodology adopted with both primary and secondary sources of data. For primary source interview and observation technique is used and for secondary source review has done based on available literatures in website, printed magazines, manual etc. An attempt has made for understanding application of frugal approach with the study of manufacturing industry project. Manufacturing industry selected for this project study is Mahindra and Mahindra Ltd. This paper will help researcher to find the connections between the two concepts productivity improvement and frugal approach. This paper will help to understand significance of frugal approach for productivity improvement in manufacturing industry. This will also help to understand current scenario of frugal approach in manufacturing industry. In manufacturing industries various process are involved to deliver the final product. In the process of converting input in to output through manufacturing process productivity plays very critical role. Hence this study will help to evolve status of frugal approach in productivity improvement programme. The notion of frugal can be viewed as an approach towards productivity improvement in manufacturing industries.
A MULTIPLE – CHANNEL QUEUING MODELS ON FUZZY ENVIRONMENTIAEME Publication
In this paper, we investigated a queuing model of fuzzy environment-based a multiple channel queuing model (M/M/C) ( /FCFS) and study its performance under realistic conditions. It applies a nonagonal fuzzy number to analyse the relevant performance of a multiple channel queuing model (M/M/C) ( /FCFS). Based on the sub interval average ranking method for nonagonal fuzzy number, we convert fuzzy number to crisp one. Numerical results reveal that the efficiency of this method. Intuitively, the fuzzy environment adapts well to a multiple channel queuing models (M/M/C) ( /FCFS) are very well.