This document analyzes a double spiral counter flow calorimeter (DSCFC) using computational fluid dynamics (CFD). The DSCFC consists of two concentric spiral channels for fluid flow over a heated base plate, allowing for heat transfer between the solid and fluid. CFD simulations are performed using ANSYS-CFX to analyze heat transfer characteristics at varying Reynolds numbers and base temperatures. The results show heat transfer decreases with increasing Reynolds number but increases with higher base temperature. Pressure and temperature profiles within the DSCFC are also presented. In conclusion, the CFD analysis finds uniform pressure drop along the spiral channels except at the mid-length, with pressure and outlet temperature decreasing at higher Reynolds numbers.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
Helical coil heat exchangers are one of the most common equipment found in many industrial applications. Helical coil heat exchanger is one of the devices which are used for the recovery system. The helical coil heat exchangers can be made in the form of a shell and tube heat exchangers and can be used for industrial applications such as power generation, nuclear industry, process plants, heat recovery systems, refrigeration, food industry etc. In our work we had designed, fabricated and experimentally analysed a helical coil heat exchanger and a straight tube heat exchanger. From the observations and calculations, the results of the helical coil heat exchanger and straight tube heat exchanger are obtained and are compared. From our obtained results, the helical coil heat exchanger showed increase in the heat transfer rate, effectiveness and overall heat transfer coefficient over the straight tube heat exchanger on all mass flow rates and operating conditions. The centrifugal force due to the curvature of the tube results in the secondary flow development which enhances the heat transfer rate. Comparative study shows that helical coil heat exchanger is having better performance that straight tube heat exchanger.
Experimental Study of Heat Transfer Enhancement of Pipe-inPipe Helical Coil H...iosrjce
Heat transfer enhancement in pipe in pipe helical coils has been research by many researchers.
While the many literatures available on heat transfer characteristics of helical coil heat exchangers. There is
very few published on validate experimental results through Computational Fluid Dynamics. This paper focuses
on experimental investigation of fluid-to-fluid heat transfer enhancement of pipe-in-pipe helical coil tubes. The
methodology of experimental analysis of a helical tubes heat exchanger, the effect of the inside tubes at constant
value of mass flow rate in Dean Number and also established the surface heat transfer coefficient. Heat transfer
characteristics inside pipe-in-pipe helical coils for various boundary conditions, that the specification of a
constant temperature at hot water inlet, constant mass flow rate. Hence, the pipe-in-pipe heat exchanger is
considering different mass flow rate inside and annulus. The fabrication of experimental setup is estimate the
heat transfer enhancement in inside helical coil tubes
Review on Comparative Study between Helical Coil and Straight Tube Heat Excha...IOSR Journals
The purpose of this study is to determine the relative advantage of using a helically coiled heat
exchanger against a straight tube heat exchanger. It is found that the heat transfer in helical circular tubes is
higher as compared to Straight tube due to their shape. Helical coils offer advantageous over straight tubes due
to their compactness and increased heat transfer coefficient. The increased heat transfer coefficients are a
consequence of the curvature of the coil, which induces centrifugal forces to act on the moving fluid, resulting in
the development of secondary flow. The curvature of the coil governs the centrifugal force while the pitch (or
helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the
development of secondary flow. Due to the curvature effect, the fluid streams in the outer side of the pipe moves
faster than the fluid streams in the inner side of the pipe. The difference in velocity sets-in secondary flows,
whose pattern changes with the Dean number of the flow.
In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall
heat transfer coefficient, effect of coldwater flow rate on effectiveness of heat exchanger when hot water mass
flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept
constant studied and compared for parallel flow, counter flow arrangement of Helical coil and Straight tube
heat exchangers. The inner heat transfer coefficient calculated from Wilson plot method. Then Nusselt no and
correlation obtained on the basis of inner heat transfer coefficient. All readings were taken at steady state
condition of heat exchanger.
The result shows that the heat transfer coefficient is affected by the geometry of the heat exchanger.
Helical coil heat exchanger are superior in all aspect studied here.
Esign and thermal evaluation of shell and helical coil heat exchangereSAT Journals
Abstract
Heat exchangers are the important engineering equipments used for transferring heat from one fluid to another. Heat exchangers are widely used in various kinds of application such as power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, petrochemical, mechanical, biomedical industries. Helical coil heat exchangers are gaining wide importance now-a-days because it can give high heat transfer coefficient in small footprint of surface area. This paper focuses on the designing of shell and helical coil heat exchanger and its thermal evaluation with counter flow configuration. The thermal analysis is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient.
Keywords— Helical coil heat exchanger, Counter flow, Flow rate, effectiveness, heat transfer coefficient etc.
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.
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGERhemantnehete
Heat exchangers are the important engineering systems with wide variety of applications including power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, chemical processing and food industries. Helical coil configuration is very effective for heat exchangers and chemical reactors because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficients. This project focus on an increase in the effectiveness of a heat exchanger and analysis of various parameters that affect the effectiveness of a heat exchanger and also deals with the performance analysis of heat exchanger by varying various parameters like number of coils, flow rate and temperature. The results of the helical tube heat exchanger are compared with the straight tube heat exchanger in both parallel and counter flow by varying parameters like temperature, flow rate of cold water and number of turns of helical coil.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
Helical coil heat exchangers are one of the most common equipment found in many industrial applications. Helical coil heat exchanger is one of the devices which are used for the recovery system. The helical coil heat exchangers can be made in the form of a shell and tube heat exchangers and can be used for industrial applications such as power generation, nuclear industry, process plants, heat recovery systems, refrigeration, food industry etc. In our work we had designed, fabricated and experimentally analysed a helical coil heat exchanger and a straight tube heat exchanger. From the observations and calculations, the results of the helical coil heat exchanger and straight tube heat exchanger are obtained and are compared. From our obtained results, the helical coil heat exchanger showed increase in the heat transfer rate, effectiveness and overall heat transfer coefficient over the straight tube heat exchanger on all mass flow rates and operating conditions. The centrifugal force due to the curvature of the tube results in the secondary flow development which enhances the heat transfer rate. Comparative study shows that helical coil heat exchanger is having better performance that straight tube heat exchanger.
Experimental Study of Heat Transfer Enhancement of Pipe-inPipe Helical Coil H...iosrjce
Heat transfer enhancement in pipe in pipe helical coils has been research by many researchers.
While the many literatures available on heat transfer characteristics of helical coil heat exchangers. There is
very few published on validate experimental results through Computational Fluid Dynamics. This paper focuses
on experimental investigation of fluid-to-fluid heat transfer enhancement of pipe-in-pipe helical coil tubes. The
methodology of experimental analysis of a helical tubes heat exchanger, the effect of the inside tubes at constant
value of mass flow rate in Dean Number and also established the surface heat transfer coefficient. Heat transfer
characteristics inside pipe-in-pipe helical coils for various boundary conditions, that the specification of a
constant temperature at hot water inlet, constant mass flow rate. Hence, the pipe-in-pipe heat exchanger is
considering different mass flow rate inside and annulus. The fabrication of experimental setup is estimate the
heat transfer enhancement in inside helical coil tubes
Review on Comparative Study between Helical Coil and Straight Tube Heat Excha...IOSR Journals
The purpose of this study is to determine the relative advantage of using a helically coiled heat
exchanger against a straight tube heat exchanger. It is found that the heat transfer in helical circular tubes is
higher as compared to Straight tube due to their shape. Helical coils offer advantageous over straight tubes due
to their compactness and increased heat transfer coefficient. The increased heat transfer coefficients are a
consequence of the curvature of the coil, which induces centrifugal forces to act on the moving fluid, resulting in
the development of secondary flow. The curvature of the coil governs the centrifugal force while the pitch (or
helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the
development of secondary flow. Due to the curvature effect, the fluid streams in the outer side of the pipe moves
faster than the fluid streams in the inner side of the pipe. The difference in velocity sets-in secondary flows,
whose pattern changes with the Dean number of the flow.
In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall
heat transfer coefficient, effect of coldwater flow rate on effectiveness of heat exchanger when hot water mass
flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept
constant studied and compared for parallel flow, counter flow arrangement of Helical coil and Straight tube
heat exchangers. The inner heat transfer coefficient calculated from Wilson plot method. Then Nusselt no and
correlation obtained on the basis of inner heat transfer coefficient. All readings were taken at steady state
condition of heat exchanger.
The result shows that the heat transfer coefficient is affected by the geometry of the heat exchanger.
Helical coil heat exchanger are superior in all aspect studied here.
Esign and thermal evaluation of shell and helical coil heat exchangereSAT Journals
Abstract
Heat exchangers are the important engineering equipments used for transferring heat from one fluid to another. Heat exchangers are widely used in various kinds of application such as power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, petrochemical, mechanical, biomedical industries. Helical coil heat exchangers are gaining wide importance now-a-days because it can give high heat transfer coefficient in small footprint of surface area. This paper focuses on the designing of shell and helical coil heat exchanger and its thermal evaluation with counter flow configuration. The thermal analysis is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient.
Keywords— Helical coil heat exchanger, Counter flow, Flow rate, effectiveness, heat transfer coefficient etc.
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.
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGERhemantnehete
Heat exchangers are the important engineering systems with wide variety of applications including power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, chemical processing and food industries. Helical coil configuration is very effective for heat exchangers and chemical reactors because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficients. This project focus on an increase in the effectiveness of a heat exchanger and analysis of various parameters that affect the effectiveness of a heat exchanger and also deals with the performance analysis of heat exchanger by varying various parameters like number of coils, flow rate and temperature. The results of the helical tube heat exchanger are compared with the straight tube heat exchanger in both parallel and counter flow by varying parameters like temperature, flow rate of cold water and number of turns of helical coil.
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
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.
A Review on Heat Transfer Improvent of Plate Heat ExchangerIJERA Editor
Plate heat exchanger has found a wide range of application in various industries like food industries, chemical industries, power plants etc. It reduces the wastage of energy and improves the overall efficiency of the system. Hence, it must be designed to obtain the maximum heat transfer possible. This paper is presented in order to study the various theories and results given over the improvement of heat transfer performance in a plate heat exchanger. However, there is still a lack in data and generalized equations for the calculation of different parameters in the heat exchanger. It requires more attention to find out various possible correlations and generalized solutions for the performance improvement of plate heat exchanger.
EXPERIMENTAL STUDY ON THE ANALYSIS OF HEAT ENHANCEMENT IN CORRUGATED TWISTED ...P singh
In heat exchanger, the enthalpy is transferred between two or more fluids, at different temperatures. The major challenge in designing a heat exchanger is to make the equipment more compact and achieve a high heat transfer rate using minimum pumping power. In recent years, the high cost of energy and material has resulted in an increased effort aimed at producing more efficient heat exchange equipment. Furthermore, as a heat exchanger becomes older, the resistance to heat transfer increases owing to fouling or scaling. The heat transfer rate can be improved by introducing a disturbance in the fluid flow thereby breaking the viscous and thermal boundary layer. However, in the process pumping power may increase significantly and ultimately the pumping cost becomes high. Therefore, to achieve a desired heat transfer rate in an existing heat exchanger at an economic pumping power, several techniques have been proposed in recent years and are discussed under the classification section.
In this work, a study of transient heat transfer in double tube heat exchanger has enhanced. The inner tube of the setup was made with corrugation on both inner and outer walls by twisting the pipe from one end, which gives the more swirling motion to the fluid particles flowing over it. The flow inside the pipe was considered as turbulent, and the analysis was done experimentally and theoretically by using the ANSYS workbench. The experimental results were compared with the experimental values taken in the setup done by considering the inner tube as normal pipe. In both heat exchangers the values were taken and compared with the theoretical analysis. Temperature distribution and heat transfer rate were calculated and the details of the study have been discussed in this paper.
Design and experimental analysis of pipe in pipe heat exchangerIJMER
Pipe in pipe heat exchanger are used in industrial process to recover heat between two
process fluids. The project carried out design of pipe in pipe heat exchanger having tube with fin and
without fin. The fins were taken in the form of semi-circular type arranged in altenating way with
spacing of 50mm.The fins were only provided on the inner tube for creating turbulence of cold water.
The number of fin were 18 and its height and thickness 10 and 1.6mm respectively. Experiment were
performed for heat exchanger with fins and without fins. The experiment were performed for different
flow rates of hot and cold fluid Different parameters like Overall heat transfer,Nusselt
number,Convective heat transfer coefficient,Pressure drop,friction factor were obtained and compared
for simple inner tube and finned tube.
HEAT TRANSFER AUGMENTATION IN STEEL QUENCHING BY SPRAY IMPINGEMENT COOLING ME...BIBHUTI BHUSAN SAMANTARAY
The present article discusses the experimental results on heat transfer characteristics of spray impingement cooling of a stationary steel plate. The eexperimental setup consisted of an electrically heated flat stationary steel plate of dimension 120 mm x 120 mm x 4 mm, spray setup, water supply and air supply unit. The effects of various controlling parameters such as air-water pressures, water flow rate, nozzle tip to target distance and impingement density were determined and analysed. The cooling rates were computed from the time dependent temperature history and used to analyse the parametric effects. The results obtained in the study confirmed the higher efficiency of the spray cooling system and the cooling strategy was found advantageous over the conventional cooling methods available in the open literature.
CFD Analysis of Concentric Tube Heat Exchanger Using Twisted TapesIJARIIT
In this paper, the three dimensional CFD modeling studies on heat transfer, friction factor and thermal performance
of concentric tube heat exchanger using twisted tapes (Plain, V-cut, , Jagged V-cut) with different twist ratios (y=2.0, 4.0) are
used. Twisted tapes are used to augment the heat transfer by creating turbulence in the fluid flow. Various methods are applied
to increase thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled
tubes, and surface tension devices. Out of these twisted tape method is used to increase the thermal performance. Twisted tape
inserts on effectiveness of heat exchanger has analyzed for different Reynolds Number. The maximum thermal performance
factor was obtained by the Jagged V-cut twisted tape (H=50) insert compare to other twisted tapes. Simultaneously the friction
factor has been analyzed
Enhancement of heat transfer in tube in-tube heat exchangers using twisted in...Ijrdt Journal
Heat exchangers have several industrial and engineering applications. There are different methods to enhance heat transfer in heat exchangers. Passive technique of heat transfer is the most economical and best suited one. The role of inserts in internal forced convection has been widely acknowledged as a passive device in the heat transfer enhancement. One of such technique is introduction of twisted inserts which enhances the heat transfer coefficient. Twisted aluminium inserts when placed in the path of the fluid flow, creates a high degree of turbulence resulting in an increase in the heat transfer rate. By placing inserts, it is expected that the benefits due to the increased heat transfer coefficient overcome the higher cost involved because of the increased frictional losses. The work mainly focuses on increasing the heat transfer of tube-in-tube heat exchangers by using twisted aluminium inserts. The results obtained from the tube with twisted aluminium insert are compared with those without twisted insert using standard properties of heat transfer (LMTD & Effectiveness). The relations based on the data gathered during this work for predicting the heat transfer coefficient of the horizontal pipe with twisted taped insert are proposed. According to the results, in order to obtain maximum heat transfer, the twist ratio must be at the lowest level.
Analysis of Coiled-Tube Heat Exchangers to Improve Heat Transfer Rate With Sp...IJMER
Steady heat transfer enhancement has been studied in helically coiled-tube heat exchangers. The outer side of the wall of the heat exchanger contains a helical corrugation which makes a helical rib on the inner side of the tube wall to induce additional swirling motion of fluid particles. Numerical calculations have been carried out to examine different geometrical parameters and the impact of flow and thermal boundary conditions for the heat transfer rate in laminar and transitional flow regimes. Calculated results have been compared to existing empirical formula and experimental tests to investigate the validity of the numerical results in case of common helical tube heat exchanger and additionally results of the numerical computation of corrugated straight tubes for laminar and transition flow have been validated with experimental tests available in the literature. Comparison of the flow and temperature fields in case of common helical tube and the coil with spirally corrugated wall configuration are discussed. Heat exchanger coils with helically corrugated wall configuration show 80–100% increase for the inner side heat transfer rate due to the additionally developed swirling motion while the relative pressure drop is 10–600% larger compared to the common helically coiled heat exchangers. New empirical Co-relation has been proposed for the fully developed inner side heat transfer prediction in case of helically corrugated wall configuration.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
These paper focuses on the effect of the inside tubes at constant value of mass flow rate and variation
of annulus mass flow rate on effect of Dean Number and overall heat transfer coefficient with constant wall
temperature, CFD analysis of a helically coiled heat exchanger. Also deals with the effect of Dean Number with
respect to Reynolds Number and Nusselt Number and Overall Heat Transfer coefficient on change of coil
configuration of helically coiled tube. The particular difference in this study in comparison with the other
similar studies was the boundary conditions for the helical coils. The results indicate that with the decrease the
inner coil diameter, the overall heat transfer coefficient is increased
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
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.
A Review on Heat Transfer Improvent of Plate Heat ExchangerIJERA Editor
Plate heat exchanger has found a wide range of application in various industries like food industries, chemical industries, power plants etc. It reduces the wastage of energy and improves the overall efficiency of the system. Hence, it must be designed to obtain the maximum heat transfer possible. This paper is presented in order to study the various theories and results given over the improvement of heat transfer performance in a plate heat exchanger. However, there is still a lack in data and generalized equations for the calculation of different parameters in the heat exchanger. It requires more attention to find out various possible correlations and generalized solutions for the performance improvement of plate heat exchanger.
EXPERIMENTAL STUDY ON THE ANALYSIS OF HEAT ENHANCEMENT IN CORRUGATED TWISTED ...P singh
In heat exchanger, the enthalpy is transferred between two or more fluids, at different temperatures. The major challenge in designing a heat exchanger is to make the equipment more compact and achieve a high heat transfer rate using minimum pumping power. In recent years, the high cost of energy and material has resulted in an increased effort aimed at producing more efficient heat exchange equipment. Furthermore, as a heat exchanger becomes older, the resistance to heat transfer increases owing to fouling or scaling. The heat transfer rate can be improved by introducing a disturbance in the fluid flow thereby breaking the viscous and thermal boundary layer. However, in the process pumping power may increase significantly and ultimately the pumping cost becomes high. Therefore, to achieve a desired heat transfer rate in an existing heat exchanger at an economic pumping power, several techniques have been proposed in recent years and are discussed under the classification section.
In this work, a study of transient heat transfer in double tube heat exchanger has enhanced. The inner tube of the setup was made with corrugation on both inner and outer walls by twisting the pipe from one end, which gives the more swirling motion to the fluid particles flowing over it. The flow inside the pipe was considered as turbulent, and the analysis was done experimentally and theoretically by using the ANSYS workbench. The experimental results were compared with the experimental values taken in the setup done by considering the inner tube as normal pipe. In both heat exchangers the values were taken and compared with the theoretical analysis. Temperature distribution and heat transfer rate were calculated and the details of the study have been discussed in this paper.
Design and experimental analysis of pipe in pipe heat exchangerIJMER
Pipe in pipe heat exchanger are used in industrial process to recover heat between two
process fluids. The project carried out design of pipe in pipe heat exchanger having tube with fin and
without fin. The fins were taken in the form of semi-circular type arranged in altenating way with
spacing of 50mm.The fins were only provided on the inner tube for creating turbulence of cold water.
The number of fin were 18 and its height and thickness 10 and 1.6mm respectively. Experiment were
performed for heat exchanger with fins and without fins. The experiment were performed for different
flow rates of hot and cold fluid Different parameters like Overall heat transfer,Nusselt
number,Convective heat transfer coefficient,Pressure drop,friction factor were obtained and compared
for simple inner tube and finned tube.
HEAT TRANSFER AUGMENTATION IN STEEL QUENCHING BY SPRAY IMPINGEMENT COOLING ME...BIBHUTI BHUSAN SAMANTARAY
The present article discusses the experimental results on heat transfer characteristics of spray impingement cooling of a stationary steel plate. The eexperimental setup consisted of an electrically heated flat stationary steel plate of dimension 120 mm x 120 mm x 4 mm, spray setup, water supply and air supply unit. The effects of various controlling parameters such as air-water pressures, water flow rate, nozzle tip to target distance and impingement density were determined and analysed. The cooling rates were computed from the time dependent temperature history and used to analyse the parametric effects. The results obtained in the study confirmed the higher efficiency of the spray cooling system and the cooling strategy was found advantageous over the conventional cooling methods available in the open literature.
CFD Analysis of Concentric Tube Heat Exchanger Using Twisted TapesIJARIIT
In this paper, the three dimensional CFD modeling studies on heat transfer, friction factor and thermal performance
of concentric tube heat exchanger using twisted tapes (Plain, V-cut, , Jagged V-cut) with different twist ratios (y=2.0, 4.0) are
used. Twisted tapes are used to augment the heat transfer by creating turbulence in the fluid flow. Various methods are applied
to increase thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled
tubes, and surface tension devices. Out of these twisted tape method is used to increase the thermal performance. Twisted tape
inserts on effectiveness of heat exchanger has analyzed for different Reynolds Number. The maximum thermal performance
factor was obtained by the Jagged V-cut twisted tape (H=50) insert compare to other twisted tapes. Simultaneously the friction
factor has been analyzed
Enhancement of heat transfer in tube in-tube heat exchangers using twisted in...Ijrdt Journal
Heat exchangers have several industrial and engineering applications. There are different methods to enhance heat transfer in heat exchangers. Passive technique of heat transfer is the most economical and best suited one. The role of inserts in internal forced convection has been widely acknowledged as a passive device in the heat transfer enhancement. One of such technique is introduction of twisted inserts which enhances the heat transfer coefficient. Twisted aluminium inserts when placed in the path of the fluid flow, creates a high degree of turbulence resulting in an increase in the heat transfer rate. By placing inserts, it is expected that the benefits due to the increased heat transfer coefficient overcome the higher cost involved because of the increased frictional losses. The work mainly focuses on increasing the heat transfer of tube-in-tube heat exchangers by using twisted aluminium inserts. The results obtained from the tube with twisted aluminium insert are compared with those without twisted insert using standard properties of heat transfer (LMTD & Effectiveness). The relations based on the data gathered during this work for predicting the heat transfer coefficient of the horizontal pipe with twisted taped insert are proposed. According to the results, in order to obtain maximum heat transfer, the twist ratio must be at the lowest level.
Analysis of Coiled-Tube Heat Exchangers to Improve Heat Transfer Rate With Sp...IJMER
Steady heat transfer enhancement has been studied in helically coiled-tube heat exchangers. The outer side of the wall of the heat exchanger contains a helical corrugation which makes a helical rib on the inner side of the tube wall to induce additional swirling motion of fluid particles. Numerical calculations have been carried out to examine different geometrical parameters and the impact of flow and thermal boundary conditions for the heat transfer rate in laminar and transitional flow regimes. Calculated results have been compared to existing empirical formula and experimental tests to investigate the validity of the numerical results in case of common helical tube heat exchanger and additionally results of the numerical computation of corrugated straight tubes for laminar and transition flow have been validated with experimental tests available in the literature. Comparison of the flow and temperature fields in case of common helical tube and the coil with spirally corrugated wall configuration are discussed. Heat exchanger coils with helically corrugated wall configuration show 80–100% increase for the inner side heat transfer rate due to the additionally developed swirling motion while the relative pressure drop is 10–600% larger compared to the common helically coiled heat exchangers. New empirical Co-relation has been proposed for the fully developed inner side heat transfer prediction in case of helically corrugated wall configuration.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
These paper focuses on the effect of the inside tubes at constant value of mass flow rate and variation
of annulus mass flow rate on effect of Dean Number and overall heat transfer coefficient with constant wall
temperature, CFD analysis of a helically coiled heat exchanger. Also deals with the effect of Dean Number with
respect to Reynolds Number and Nusselt Number and Overall Heat Transfer coefficient on change of coil
configuration of helically coiled tube. The particular difference in this study in comparison with the other
similar studies was the boundary conditions for the helical coils. The results indicate that with the decrease the
inner coil diameter, the overall heat transfer coefficient is increased
Analysis of Composite Material Blended With Thermoplastics and Jute FibreIJERA Editor
Recently natural fibres have been receiving considerable attention as substitutes for synthetic fibre
reinforcements due to their low cost, low density, acceptable specific strength, good thermal insulation
properties, reduced tool wear, reduced thermal and respiratory irritation and renewable resources. The aim of
this work is to develop chemically treated and chemically untreated fibre reinforced composite material with
optimum properties so that it can replace the existing synthetic fibre reinforced composite material for a suitable
application. In this work, polyester resin has been reinforced with jute fabric, so as to develop jute fibre
reinforced plastic (JFRP) with a weight ratio of 10:1:1 Hand lay-up technique was used to manufacture the
composites where Methyl Ethyl Ketone Peroxide and cobalt Naphthalene were used as coupling agent and
accelerator respectively. The thickness of the composite specimen was obtained by laying up layer of fibre and
matrix. The untreated composites have been used and mechanical properties are compared with natural fibre and
jute fibre composite by using the Ansys method.
Dynamic Metadata Management in Semantic File SystemsIJERA Editor
The progression in data capacity and difficulty inflicts great challenges for file systems. To address these contests, an inventive namespace management scheme is in distracted need to deliver both the ease and competence of data access. For scalability, each server makes only local, autonomous decisions about relocation for load balancing. Associative access is provided by a traditional extension to present tree-structured file system conventions, and by protocols that are intended specifically for content based access.Rapid attribute-based accesstofile system contents is fulfilled by instinctive extraction and indexing of key properties of file system objects. The programmed indexing of files and calendars is called “semantic” because user programmable transducers use data about the semantics of efficient file system objects to extract the properties for indexing. Tentative results from a semantic file system execution support the thesis that semantic file systems present a more active storage abstraction than do traditional tree planned file systems for data sharing and command level programming. Semantic file system is executed as a middleware in predictable file systems and works orthogonally with categorized directory trees. The semantic relationships and file groups recognized in file systems can also be used to facilitate file prefetching among other system-level optimizations. All-encompassing trace-driven experiments on our sample implementation validate the efficiency and competence.
Analysis of the Effect of Electric and Magnetic Loadings on the Design Parame...IJERA Editor
This paper looks at the effect of magnetic loading and electric loading on the design parameters of an induction motor and its performance. The study involves the use of MATLAB to simulate 50kW, 3-phase, 415V, 50Hz, 6 poles induction machine. Based on the variation of the magnetic and electric loading of the machine, the various design values of the rotor and stator of the machine are specified. The performance index which includes stator loss, rotor loss, cost, power factor, efficiency, and torque are also specified for squirrel cage induction motor (SCIM)
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Analysis of Heat Transfer in Spiral Plate Heat Exchanger Using Experimental a...ijsrd.com
Heat transfer is the key to several processes in industrial application. In a present days maximum efficient heat transfer equipment are in demand due to increasing energy cost. For achieving maximum heat transfer, the engineers are continuously upgrading their knowledge and skills by their past experience. Present work is a skip in the direction of demonstrating the use of the computational technique as a tool to substitute experimental techniques. For this purpose an experimental set up has been designed and developed. Analysis of heat transfer in spiral plate heat exchanger is performed and same Analysis of heat transfer in spiral plate heat exchanger can be done by commercially procurable computational fluid dynamic (CFD) using ANSYS CFX and validated based on this forecasting. Analysis has been carried out in parallel and counter flow with inward and outward direction for achieving maximum possible heat transfer. In this problem of heat transfer involved the condition where Reynolds number again and again varies as the fluid traverses inside the section of flow from inlet to exit, mass flow rate of working fluid is been modified with time. By more and more analysis and experimentation and systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward parallel flow configuration compared to all other counterparts, which observed to vary with small difference in each section. Furthermore, for the increase heat transfer rate in spiral plate heat exchanger is obtain by cascading system.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Cfd and conjugate heat transfer analysis of heat sinks with different fin geo...eSAT Journals
Abstract Heat sinks are commonly used for cooling of electronic devices. Heat sinks, an array of heat fins, remove the heat from the surfaces of the chips by enhancing the heat Transfer rate through heat conduction process. Heat can also be removed from the chip surfaces through forced convection heat transfer. In this project work, CFD and conjugate heat transfer analysis is carried out for various fin geometries with Zigzag, Fluted, Slanted mirror, Custom pin fin and staggered array configurations for low thermal resistance and minimum pressure drop. Numerical simulations are carried out for each of the above mentioned fin geometries with common base plate thickness of 2 mm, fin height of 28 mm and fin thickness of 1 mm for three different heat loads namely 50 W, 75 W and 100 W with air flow of 3.933 m/s (15 ft3/min or 15 CFM) and air inlet temperature of 25oC. The results are compared for thermal performance of a heat sink for each of above geometries and it is observe that the fin with Slanted Mirror geometry gives the best performance among all the other geometries for minimum Pressure drop. The average heat transfer coefficients for fins with slanted mirror geometry, zig zag configuration, fluted type, custom pin fin and staggered array are found to be 215 W/m2K, 164 W/m2K, 164 W/m2K, 157 W/m2K and 145 W/m2K respectively Keywords: Fin geometries of Heat sinks, Computational Fluid Dynamics, Conjugate heat transfer.
Optimization of a Shell and Tube Condenser using Numerical MethodIJERA Editor
The purpose of this study was to investigate the effect of installation of the tube external surfaces, their parameter and variable in a shell-and-tube condenser. Variation of heat transfer coefficient with each variable of shell and tube condenser was measured each test. The optimization tube outside diameter size was analyzed and use extended surface area attached tube with tube material and tube layout and arrangement (Number of tube a triangular or hexagonal arrangement) on shell-and tube condenser. The computer programming was used to get faster output in less time. Results suggest that mean heat transfer coefficient in variable condition were mainly at velocity is fixed. And also average additional surfaces and tube layout and the arrangement comparison with the quantity of the heat transfer.
AN EXPERIMENTAL STUDY OF HEAT TRANSFER IN A CORRUGATED PLATE HEAT EXCHANGER IAEME Publication
In the present work an attempt has been made to investigate the performance of a corrugated plate heat exchanger by the first law and the second law of thermodynamics. Experiments were conducted to determine the laminar convective heat transfer characteristics for fully developed flow of hot and cold fluid in alternate ducts. Experiments were conducted on a three channel 1-1 pass corrugated plate heat exchanger. Hot fluid was made to flow in the central channel to get cooled by
cold fluid in the top and bottom channels in parallel and counter flow arrangements.
Performance of water and diluted ethylene glycol as coolants for electronic c...IJERA Editor
As the number of transistors increases with new generation of microprocessor chips, the power draw and heat load to dissipate during operation increases. As a result of increasing the heat loads and heat fluxes the Conventional cooling technologies such as fan, heat sinks are unable to absorb and heat transfer excess heat dissipated by these new microprocessor. So, new technologies are needed to improve the heat removal capacity. In the present work single phase liquid cooling system with mini channel is analyzed and experimentally investigated. Mini channels are chosen as to provide higher heat transfer co-efficient than conventional channel. Copper pipes of 0.36 mm diameter are taken to fabricate heat sink and heat exchanger. A pump is used to circulate the fluid through heat sink and heat exchanger. A solid heated aluminium block to simulate heat generated electronic component is used and electrical input is supplied to the heated aluminium block and cooling system is placed over the heated block. The performance of the cooling system is analyzed from the experimental data obtained. It is experimentally observed that the mini channel liquid cooling system with water as a coolant has better performance than diluted ethylene glycol as coolant at different flow rates. The surface temperature of the heated aluminium block with convective heat transfer co-efficient is observed
STUDY OF HEAT TRANSFER ON BROKEN ARC ROUGHNESS ELEMENTS ON THE ABSORBER PLATE...IAEME Publication
Performance of solar air heater can be enhanced by adding roughness to the inner periphery. The present study on the effect of various shape parameters for broken arc roughness elements of heat transfer and friction factor characteristics of rectangular duct. The duct has Reynolds number (Re) range of 3000-22300, respective roughness height (e/D) values is 0.045, arc angle (α) is 60˚ and roughness width (W/w) is 5 and relatively roughness pitch is 8.
Critical heat flux enhancement in pool boiling with al2 o3 water nanofluideSAT Journals
Abstract Boiling is an important phase change phenomena as it plays a crucial role in the design of high heat flux system like boilers, heat exchangers, microscopic heat transfer devices. However boiling phenomenon is limited by critical heat flux. At critical heat flux material of heated surface suffers physical damage due to lower heat transfer resulting from thin film formed over the surface. Now a days Nanofluid which is colloidal suspension of nanoparticle in base fluid is highlighted as innovative techniques to enhance critical heat flux. In the present study Al2O3 nanoparticles were characterized by using SEM and XRD analysis. From SEM images it was seen that nanoparticle has spherical morphology, and from XRD analysis average nanoparticle size determined was 29.48 nm. Five different nanofluids of concentration range from 3 gram/liter to 15 gram/liter were prepared. Critical heat flux (CHF) of each Al2O3-water nanofluid in pool boiling is determined on NiCr wire of SWG 28. The minimum critical heat flux enhancement is 30.53% at 3 gram/liter nanofluid compared to critical heat flux of distilled water. The highest critical heat flux enhancement is 72.70 % at 12 gram/liter nanofluid. Critical heat flux of nanofluid increases with increase in concentration of Al2O3 nanoparticle in distilled water up to 12 gram/liter nanofluid. Surface roughness of bare wire was 0.126 μm. Surface roughness of wire sample used in pool boiling of 3 gram/liter nanofluid is 0.299μm and highest surface roughness was 0.715 μm of heater used in pool boiling of 12 gram/liter nanofluid. The Surface roughness measurement results show the evidence of nanoparticle deposition on wire surface and its effect on Critical Heat Flux enhancement. Keywords: Critical heat flux, Nanoparticle, Nanofluid, Concentration, Surface roughness.
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Final project report on grocery store management system..pdfKamal Acharya
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Analysis of A Double Spiral Counter Flow Calorimeter in Impinging Flame Jet Using CFD Tool
1. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -5) March 2015, pp.54-59
www.ijera.com 54 | P a g e
Analysis of A Double Spiral Counter Flow Calorimeter in
Impinging Flame Jet Using CFD Tool
Santosh Bagewadi, A M Mulla, Dilip Sutraway
(Assistant Professor Department of Mechanical Engineering SECAB I E T Vijaypur, Karnataka, India-586101)
ABSTRACT
Enhancement of heat transfer rates in heat exchanger and calorimeter has been reported by many researchers.
However, work regarding heat transfer characteristics analysis of double spiral counter flow calorimeter is not
published and this forms the objective of this work. DSCFC is a unique design where it consists of single fluid as
working fluid for heat exchange. Here heat transfer takes place between solid and fluid, and hence can be called
as conjugate heat transfer problem. Heat transfer characteristics DSCFC is observed at various Reynolds number
and base temperature. DSCFC is analyzed considering conjugate heat transfer and temperature dependent
properties of heat transport media. Computations are performed using commercially available CFD package
ANSYS-CFX. It is observed that with increase in Reynolds number of the fluid, heat transfer reduces whereas
increase in base temperature increases heat transfer. The Computational results are compared with the
experimental.
Keywords: Double spiral calorimeter, Computational Fluid Dynamics, Conjugate heat transfer.
I. INTRODUCTION
A calorimeter is an object used for calorimetry,
or the process of measuring the physical changes as
well as heat capacity. The cooling or heating jacket
controls the temperature of the process. Heat is
measured by monitoring the heat gained or lost by the
heat transfer fluid. Constant flux calorimetry is
derived from heat balance calorimetry and uses
specialized control mechanisms to maintain a
constant heat flow (or flux) across the vessel wall.
Flame jet impingement heat transfer is a very
important process in industry and is used for many
applications like melting of scrap metal, shaping of
glass, welding, etc. Other advantage is that by this
method we can reduce the fuel consumption hence
we can increase the efficiency of the system of the
industry where heating is used. A lot of research
work has been carried in this area, both experimental
and numerical. Moreover, during practical analysis
the target surface is curved (i.e. cylindrical or
spherical). All experimental analysis where made by
taking the water as the cooling media, on copper or
brass plate and constant temperature boundary
condition where applied.
Double Spiral Counter Flow Calorimeter
(DSCFC) of constant flow area of 80 mm2 will be
used and the heat transfer takes place from flame to
calorimeter base plate/ target plate and then from
constant temperature base plate (isothermal) to spiral
flow water, it attains not only high heat transfer co-
efficient but also improved cooling uniformity and
maintain constant base plate temperature. In this
project a double spiral counter flow calorimeter set-
up is studied and it consists of spiral flow domain of
two concentric channels as shown in Figure 1. In a
DSCFC, the cold fluid enters inlet, flows inward and
comes out outward as hot fluid by absorbing the
energy from base plate.
Computational fluid dynamics is the branch of
fluid dynamics providing a cost effective means of
simulating real flows by the numerical solution of
governing equation. As a result of these factors,
Computational Fluid Dynamics is now an established
industrial design tool, helping to reduce design
timescales and improve processes throughout the
engineering world. CFD provides a cost-effective
and accurate alternative to scale model testing, with
variations on the simulation being performed quickly,
offering obvious advantages.
Fig.1 Double Spiral Counter Flow Calorimeter
RESEARCH ARTICLE OPEN ACCESS
2. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -5) March 2015, pp.54-59
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II. Literature Review
Baukal et al [1] (1995) studied the targets were
used cylinders, flat plates and hemi-nosed cylinders.
Forced convection (laminar and turbulent) and
thermo-chemical heat release, have been the most
important heat transfer processes. Several semi-
analytic solutions have been developed, for the heat
flux to the forward stagnation point of a body of
revolution. These were originally developed for
aerospace applications, such as rocket re-entry into
the earth's atmosphere. These solutions, and many
variations, have been used to simulate flame
impingement heat transfer. The results of sample
calculations are compared to some of the
experimental measurement. Twelve flame
impingement experimental studies have been
considered here. In those studies, the measured heat
flux has been compared against one or more semi-
analytic solutions. Cylindrical, flat plate, and
hemisphere cylindrical targets have been used in one,
three, and nine studies respectively.
Baukal et al [2] (1997) reported on Surface
Condition Effects on Flame Impingement Heat
Transfer, This study investigated the heat transfer
from oxygen-enhanced, natural gas flames (15 kW)
impinging normal to a water-cooled metal disk (d b =
135 mm) segmented into concentric calorimetric
rings. Polished, untreated, and blackened surfaces
were used to study emissivity effects. The heat flux
to the blackened and polished surfaces was the
highest and lowest, respectively. The flux to
untreated surfaces was between the highest and
lowest fluxes. The largest difference in the flux,
between the polished and blackened surfaces, was
only 9.8%. Catalytic effects were investigated by
using alumina-coated (nearly non-catalytic),
untreated, and platinum-coated (highly catalytic)
surfaces. The heat flux to platinum-coated surfaces
was the highest. The fluxes to untreated surfaces
were similar to those for alumina-coated surfaces.
The largest difference in the flux, between the
platinum-coated and the alumina-coated surfaces,
was only 12%. Therefore, both non luminous flame
radiation and the thermo chemical heat release from
surface catalytic reactions were relatively small
fractions of the total heat flux. Inlet and outlet water
temperature measured, from which heat equation
were calculated.
Dong et al [3] (2003) studied the experimental
investigation of the flame shape and the heat transfer
and wall pressure characteristics of a pair of laminar
premixed butane/air flame jets impinging vertically
upon a horizontal water-cooled flat plate at jet
Reynolds numbers of 800, 1000 and 1200,
respectively. Equivalence ratio of the butane/air
mixture was maintained constantly at unity. The
flame shape, the pressure distribution on the
impingement plate and the heat transfer from the
flame to the plate were greatly influenced by the
interference occurred between the two flame jets.
This interference caused a sharp pressure peak at the
between-jet midpoint and the positive pressures at the
between-jet area, which led to the separation of the
wall jet from the impingement plate after collision.
The flame impingement surface was a square copper
plate of 200 mm long, 200 mm wide and 8 mm thick.
It was uniformly cooled on its backside by a cooling
water jacket. Copper was selected to fabricate the
plate because of its excellent thermal conductivity.
The top plate of the cooling water jacket was made of
Plexiglas to enable the water flow to be visualized. A
stainless steel frame was used to support the copper
plate and the cooling water jacket, so that the plate
could be placed either horizontally or tilted at a
selected angle relative to the burner. After a change
in the operating condition had been made,
measurements were only conducted after the steady-
state conditions had been established.
Shuhn-Shyurng Hou et al [4] (2003) studied the
measurements of temperature distributions, a water-
cooled stainless plate, 20 mm thick and 100 mm in
diameter, is used as the stagnation plane, as shown in
Fig. 1. The cooling water, supplied by a circulatory
(thermostatic water container), flows into the water-
cooled plate and removes the heat from the flame.
The thermal efficiency of an impinging flame is
defined as the percentage of the thermal input
transferred to the cooling water. Therefore, the
thermal efficiency equation can be determined by
measuring temperature difference between the inlet
and outlet cooling water,
Subhash Chander et al [5] (2005) used copper
plate of 8 mm thickness and 300 mm diameter as the
impingement surface. The surface of the plate was
smooth and it did not have any coating on it. There
was no soot deposition on the surface; still as
precaution it was periodically cleaned. A water jacket
was provided at the rear of the copper plate to evenly
cool the plate from the backside. Water flows into the
calorimeter at the center and comes out from the
calorimeter through the two exits provided at
diametrically opposite points. Inlet and outlet
temperatures of the water were measured with T type
thermocouples with full-scale accuracy of ±0.5%.
Tuttle et al [6] (2004) fabricated impingement
plate, measuring 71 cm square, with two layers of
aluminum plate separated by a rubber seal. The
bottom plate, made of 7075-T6 aluminum of
thickness 1.27 cm is exposed to the impinging flame,
with milled parallel grooves through which cooling
water flows. The flow of the cooling water was
regulated with three calibrated variable area flow
meters. Thermocouples were used to measure the
temperature of the water flowing in and out of the
plate to maintain the plate at a near-constant
temperature.
3. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
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Kwok et al [7] (2004) studied three flame jets
impinged vertically upward onto a water-cooled
copper impingement plate having a surface area of
500 • 500 mm2 and a thickness of 8 mm. The cooling
water was kept at a temperature of 38oC by a
refrigerator to eliminate the condensation of water
vapour on the impingement plate surface. A heat flux
transducer having an effective sensing area of 6 mm2
was installed at the centre of the flame-side surface of
the impingement plate to measure the local heat flux
from the flame to the plate. By moving the three-
dimensional positioner horizontally in the x–y plane,
the local heat flux of a point on the impingement
plate relative to the stagnation point could be
measured, such that the heat flux distributions in the
x- and y directions of the impingement plate were
obtained. The heat flux received by the impingement
plate was reduced when the nozzle-to-plate distance
was increased.
Van Der Meer et al [8] (1991) studied the two
thermo-stated baths provided water flow of a constant
temperature. This flow was forced to pass through a
channel between a copper plate and a glass plate
separated by a small distance of 2.9 mm. The water
flowed along the copper plate into a reservoir behind
the plate and from that reservoir back into the first of
the two thermo-stated baths. In this way one side of
the glass plate was kept to a nearly constant
temperature provided the flow in the channel was
homogeneous and the heat transfer coefficient to the
glass plate very high. The temperature of the water
flowing through the channel was measured by
thermocouples. The other side of the glass plate was
covered with a thin layer of liquid crystals to measure
its surface temperature.
Jayakumara et al [9] (1997) studied heat transfer
characteristics of double pipe helical heat exchangers.
Heat transfer characteristics inside a helical coil for
various boundary conditions are compared. It is
found that the specification of a constant temperature
or constant heat flux boundary condition for an actual
heat exchanger does not yield proper modeling.
Hence, the heat exchanger is analyzed considering
conjugate heat transfer and temperature dependent
properties of heat transport media. Experimental
results are compared with the CFD calculation results
using the CFD package FLUENT 6.2. Based on the
experimental results a correlation is developed to
calculate the inner heat transfer coefficient of the
helical coil.
Achmad Nursyamsu [10] (2007) analyzing the
flow of water in a horizontal spiral pipe by
comparing the pitch distance 236 mm, 246 mm, 256
mm in a spiral pipe with a smooth surface. This is to
determine how far the effects of changes in pitch on
pressure drop are obtained and also to determine the
velocity vector of water flow in horizontal spiral pipe
using CFD method. By making a model of spiral pipe
and done meshing using hybrid simulation
configuration element type or tetrahedron, with
meshing the volume and size intervals of 5, and make
the boundary condition using the value V = 0.73 m / s
and Dh = 0032 m, so that pressure loss is obtained
and velocity at 246 mm pitch with a smaller decrease
in pressure (896.4 Pa) and the velocity distribution of
larger (max: 1.70 m / s, min: 5.39 x 10-2 m / S).
III. The solid modeling of DSCFC in
CFD-ICEM
Figure 2 shows the construction of spiral strip on
copper base plate, this strip forms a spiral flow
passage over the base plate. Figure-3 show the top
plate constructed on spiral strip, where adiabatic
boundary condition is applied
Fig-2 Base plate with spiral strip
Fig-3 complete model
Fig-4 Inlet flow position
4. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -5) March 2015, pp.54-59
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Fig-5 outlet flow position
Boundary and Initial Conditions:
Since a finite flow domain is specified, physical
conditions are required on the boundaries of the flow
domain. The simulation generally starts from an
initial solution and uses an iterative method to reach a
final flow field solution. Boundary condition of
isothermal surface of the base plate and other
surfaces are adiabatic is considered for the present
study.
The simulation is performed with cfx solver with
various possible options for interactive or batch
processing and distributed processing.
IV. Results and Discussion
In this section results from the post processing
using CFD-POST is observed and represented. Plots
are plotted for parameters which are responsible for
performance of the double spiral counter flow
calorimeter. The following are some of the results
and discussion of the same.
For inlet fluid velocity of 0.057m/s (Re=199.6) and
base temperature of 343 ok. The pressure,
temperature and velocity profile are shown as
figure-6
Fig-6 pressure, temp and velocity profile
For inlet fluid velocity of 0.096m/s (Re=336.2) and
base temperature of 343o k. The pressure,
temperature and velocity profile are shown in
figure-7
5. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
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Fig-7 pressure, temprature and velocity profile.
For inlet fluid velocity of 0.124m/s (Re=434.3) and
base temperature of 343o K. The pressure,
temperature and velocity profile as shown in
figure-8
Fig-8 pressure, temprature and velocity profile.
V. CONCLUSION:
For steady state analysis, the pressure drop for
calorimeter along the length of the flow is found to
be uniform except at the mid length and found to be
increasing with the Reynolds number. At the centre
of the plate there is sharp decline in pressure due to
change in the cross sectional area of flow. The
pressure recovery takes place in a short distance.
It is observed that temperature of water gradually
increased along the flow length because it picks up
heat during the course of the flow. There is a clear
evidence of the heat transfer cross the vertical strip
separating the adjacent counter flow hot and cold
steams.
For constant inlet and base temperatures, the out
let temperature of the water decreases with Reynolds
number.
Velocity suddenly increases at mid length due to
change in cross section area of DSCFC, velocity
recovers in a short distance in the downstream and
remains almost constant till the outlet.
There is no evidence of the influence of the base
temperature on the velocity distribution.
REFERENCES
[1] Baukal C.E. and Gebhart B. (1995) “A
review of semi-analytical solutions for flame
impingement heat transfer” Department of
Mechanical Engineering and Applied
Mechanics, University of Pennsylvania,
Philadelphia, PA 19104-6315, U.S.A
[2] Baukal C.E. and Gebhart B. (1997)
“Surface Condition Effects on Flame
Impingement Heat Transfer” Mechanical
Engineering and Applied Mechanics,
University of Pennsylvania, Philadelphia,
Pennsylvania
[3] Dong L.L, Leung C.W and Cheung C.S.
(2003) “Heat transfer and wall pressure
6. Santosh Bagewadi et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -5) March 2015, pp.54-59
www.ijera.com 59 | P a g e
characteristics of a twin premixed
butane/air flame jets“ Department of
Mechanical Engineering, The Hong Kong
Polytechnic University.
[4] Shuhn-Shyurng Hou ,Yung-Chang Ko (2003)
“Effects of heating height on flame
appearance, temperature field and efficiency
of an impinging laminar jet flame used in
domestic gas stoves” Department of
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