As we know that fins are basically a extended surface which is use to increase the heat transfer rate,
this is basically a secondary surface mounted on primary surface to augment heat transfer from it . To dissipate
heat at faster rate, different heat transfer enhancement methods have been suggested in literature. Active and
passive heat transfer techniques are commonly employed for heat transfer augmentation in fluids.
Recent development in technology has led to demand for high performance lightweight, and compact heat
transfer equipment. To provide accommodation with this demand, finned surface are usually used to increase
rate of heat transfer. The excessive heat must be dissipated to the surrounding for smooth functioning of system.
This is more important in cooling of gas turbine blade, thermal power plants, air conditioning equipment and
electrical / electronic component. This component is getting more compacting size, which generates heat
continuously. This excessive heat will reduce the life of component. To overcome this problem there is need of
effective cooling system. Therefore now a day’s industries are utilizing thermal system such as ribs, fins, baffles
etc. The turbulence occurred due to these passive techniques are good enough to increase rate of heat transfer.
Our project is an extension in this direction to analysis the heat augmentation capacity of rectangular heat fin
array.
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.
Enhancing heat transfer surface are used in many
engineering applications such as heat exchanger, air conditioning,
chemical reactor and refrigeration systems, hence many
techniques have been investigated on enhancement of heat
transfer rate and decrease the size and cost of the involving
equipment especially in heat exchangers. One of the most
important techniques used are passive heat transfer technique.
These tchniques when adopted in Heat exchanger proved that the
overall thermal performance improved significantly. This paper
reviews experimental and numerical works taken by researchers
on this technique since 2004 such as twisted tape, wire coil, swirl
flow generator, etc. to enhance the thermal efficiency in heat
exchangers and useful to designers implementing passive
augmentation techniques in heat exchange. The authors found
that variously developed twisted tape inserts are popular
researched and used to strengthen the heat transfer efficiency for
heat exchangers. The other techniques used for specific work
environments are studied in this paper. Twisted tape inserts
perform better in laminar flow than turbulent flow. However, the
other several passive techniques such as ribs, conical nozzle, and
conical ring, etc. are generally more efficient in the turbulent flow
than in the laminar flow.
The heat transfer and friction factor were
experimentally investigated in a louvered strip inserted tube in
turbulent flow region. A copper tube of (I.D=28mm, O.D=32mm)
and 900mm length was used. A louvered strip insert with
different geometrical configuration was inserted into the smooth
tube. A uniform heat flux condition was created by wrapping
heating tape of 2500 watt around the test section. Fibre glass
cloth was used as a thermal insulator which surrounds the
heating tape. Outer surface temperature of the tube were
measured at five different equally spaced points of test section by
k-typethermocouples. Two thermocouples were used to measure
the inlet and outlet temperature of water. The Reynolds numbers
were varied in the range of 2500 to 4000 with constant heat flux
of 24 kw/m2 for smooth tube and louvered strip inserted. Nusselt
number and friction factor obtained for louvered strip (with
forward backward arrangement) > Nusselt number and friction
factor for louvered strip (with semi-forward semi-backward
arrangement)> Nusselt number and friction factor for louvered
strip (with forward arrengement).
ENHANCEMENT OF HEAT TRANSFER IN SHELL AND TUBE HEAT EXCHANGER WITH TABULATOR ...IAEME Publication
The present work reported the use of variant twisted tapes fitted in a double pipe heat exchanger to improve the fluid mixing that leads to higher heat transfer rate with respect to that of the plain-twisted tape. Heat transfer, flow friction and thermal enhancement factor characteristics in a double pipe heat exchanger fitted with plain and variant twisted tapes using water as working fluid are investigated experimentally. Tests are performed for laminar flow ranges. The experimental data for a plain tube and plain-twisted tapes are validated using the standard correlations available in the literature. Two different variant twisted tapes which include V cut-twisted tape and Horizontal wing cut-twisted tape with twist ratios of y = 2.0, 4.4 and 6.0 are used. In addition, the variation of heat transfer coefficient of copper–nanofluids with different of Reynold's number and volume concentration of nanoparticles in plain tube without twisted tape.
Experimental Investigation on Heat Transfer Enhancement in Laminar Flow in Ci...IDES Editor
An experimental investigation of heat transfer and
friction factor of a smooth tube fitted with full length twisted
tape inserts for laminar flow have been studied under uniform
wall heat flux condition. The experiments has been carried
out to study the tape fin effect by using full length tape inserts
of different materials namely Aluminum, Stainless steel and
insulated tape. The tapes have twist ratios from 5.2 to 3.4. It is
found that, for the flow in smooth tubes, full length twisted
tapes yield improvement in average Nusselt number, for
Reynolds number range of 200 to 2000.For Aluminum tapes,
the maximum improvement in Nusselt number range from
50% to 100%; for Stainless steel tapes, maximum
improvement in Nusselt number range from 40% to 94% and
for insulated tapes, maximum improvement in Nusselt
number range from 40% to 67%. The isothermal friction factor
for the flow with the twisted tape inserts are 340% to 750 %
higher as compared with those of smooth tube flow, in the
given range of twist ratios.
Solar air heater (SAH), which is the most essential component of solar drying systems, receive solar energy and convert it into thermal energy. This review presents descriptions and previous works conducted on performances analysis of SAHs. Exergoenviroeconomic, exergoenvironmental, environmental, and exergy analyses are also presented. In addition, results on the performances of SAHs are summarized. The exergy and energy efficiencies of SAHs at laboratorium testing range from 8% to 61% and from 30% to 79%, respectively.
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.
Enhancing heat transfer surface are used in many
engineering applications such as heat exchanger, air conditioning,
chemical reactor and refrigeration systems, hence many
techniques have been investigated on enhancement of heat
transfer rate and decrease the size and cost of the involving
equipment especially in heat exchangers. One of the most
important techniques used are passive heat transfer technique.
These tchniques when adopted in Heat exchanger proved that the
overall thermal performance improved significantly. This paper
reviews experimental and numerical works taken by researchers
on this technique since 2004 such as twisted tape, wire coil, swirl
flow generator, etc. to enhance the thermal efficiency in heat
exchangers and useful to designers implementing passive
augmentation techniques in heat exchange. The authors found
that variously developed twisted tape inserts are popular
researched and used to strengthen the heat transfer efficiency for
heat exchangers. The other techniques used for specific work
environments are studied in this paper. Twisted tape inserts
perform better in laminar flow than turbulent flow. However, the
other several passive techniques such as ribs, conical nozzle, and
conical ring, etc. are generally more efficient in the turbulent flow
than in the laminar flow.
The heat transfer and friction factor were
experimentally investigated in a louvered strip inserted tube in
turbulent flow region. A copper tube of (I.D=28mm, O.D=32mm)
and 900mm length was used. A louvered strip insert with
different geometrical configuration was inserted into the smooth
tube. A uniform heat flux condition was created by wrapping
heating tape of 2500 watt around the test section. Fibre glass
cloth was used as a thermal insulator which surrounds the
heating tape. Outer surface temperature of the tube were
measured at five different equally spaced points of test section by
k-typethermocouples. Two thermocouples were used to measure
the inlet and outlet temperature of water. The Reynolds numbers
were varied in the range of 2500 to 4000 with constant heat flux
of 24 kw/m2 for smooth tube and louvered strip inserted. Nusselt
number and friction factor obtained for louvered strip (with
forward backward arrangement) > Nusselt number and friction
factor for louvered strip (with semi-forward semi-backward
arrangement)> Nusselt number and friction factor for louvered
strip (with forward arrengement).
ENHANCEMENT OF HEAT TRANSFER IN SHELL AND TUBE HEAT EXCHANGER WITH TABULATOR ...IAEME Publication
The present work reported the use of variant twisted tapes fitted in a double pipe heat exchanger to improve the fluid mixing that leads to higher heat transfer rate with respect to that of the plain-twisted tape. Heat transfer, flow friction and thermal enhancement factor characteristics in a double pipe heat exchanger fitted with plain and variant twisted tapes using water as working fluid are investigated experimentally. Tests are performed for laminar flow ranges. The experimental data for a plain tube and plain-twisted tapes are validated using the standard correlations available in the literature. Two different variant twisted tapes which include V cut-twisted tape and Horizontal wing cut-twisted tape with twist ratios of y = 2.0, 4.4 and 6.0 are used. In addition, the variation of heat transfer coefficient of copper–nanofluids with different of Reynold's number and volume concentration of nanoparticles in plain tube without twisted tape.
Experimental Investigation on Heat Transfer Enhancement in Laminar Flow in Ci...IDES Editor
An experimental investigation of heat transfer and
friction factor of a smooth tube fitted with full length twisted
tape inserts for laminar flow have been studied under uniform
wall heat flux condition. The experiments has been carried
out to study the tape fin effect by using full length tape inserts
of different materials namely Aluminum, Stainless steel and
insulated tape. The tapes have twist ratios from 5.2 to 3.4. It is
found that, for the flow in smooth tubes, full length twisted
tapes yield improvement in average Nusselt number, for
Reynolds number range of 200 to 2000.For Aluminum tapes,
the maximum improvement in Nusselt number range from
50% to 100%; for Stainless steel tapes, maximum
improvement in Nusselt number range from 40% to 94% and
for insulated tapes, maximum improvement in Nusselt
number range from 40% to 67%. The isothermal friction factor
for the flow with the twisted tape inserts are 340% to 750 %
higher as compared with those of smooth tube flow, in the
given range of twist ratios.
Solar air heater (SAH), which is the most essential component of solar drying systems, receive solar energy and convert it into thermal energy. This review presents descriptions and previous works conducted on performances analysis of SAHs. Exergoenviroeconomic, exergoenvironmental, environmental, and exergy analyses are also presented. In addition, results on the performances of SAHs are summarized. The exergy and energy efficiencies of SAHs at laboratorium testing range from 8% to 61% and from 30% to 79%, respectively.
MERKELS METHOD FOR DESIGNING INDUCED DRAFT COOLING TOWERIAEME Publication
In general, cooling towers are used to dissipate process waste heat into the atmosphere. In this paper, induced draft cooling tower has been designed by simplified merkel’s method. The design of cooling tower is based on Merkel’s method. The t ower characteristic is determined by the ratio of range and log-mean-enthalpy difference. Optimization of the operating conditions for cooling tower applications in cooling water is extremely significant in order to get the most energy efficient operating point for these systems. A simple algebraic formula is used to calculate the optimum water-to-air flow rate. Merkel’s method is the most widely accepted theory for cooling tower calculations. It combines equations for heat and water vapor transfer. The objective of this paper is to present the design procedure of counter – flow cooling towers in a simplified manner
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Abstract: Heat pipe are high-efficient heat transfer devices and have been widely applied in various thermal systems. Since heat pipe utilize the phase change of the working fluid to transport the heat, the selection of working fluid is of essential importance to promote the thermal performance of heat pipe. Owing to the heat transfer enhancement effect of nanofluid in the single phase and phase change heat transfer, some researchers have applied various nanofluids in heat pipe as the working fluids to enhance their heat transfer performance.
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
An experimental investigation of annular fins under forced convectioneSAT Journals
Abstract
Heat transfer characteristics under forced convection are investigated experimentally by varying parameters like surface area,
base-to-ambient temperature difference and Reynolds number. To investigate the performance of fins experimentally, fins made of
aluminium (high thermal conductivity) are taken. For varying the surface area fin with 11 mm diameter without circumferential
fins, fin with 31 mm diameter and annular fins of 31 mm diameter are taken as specimens. Base to ambient temperature difference
is varied with the aid of dimmerstat ranging from 25W to 45W. Reynolds number is also varied by varying the velocities of air.
Velocities are varied by the aid of fan. Then these fins are tested under different load conditions, different Reynolds number by
varying the surface area of fins increase the rate of heat transfer. With the variation of relevant parameters under forced
convection heat transfer rates are analyzed experimentally. Experiments are conducted by using the annular fins, fin with
diameter 11mm without circumferential fins and fin with diameter 31mm at different Reynolds number and loads under forced
convection and comparison is made between fins. Experimental results shows that forced convection heat transfer rate from fins
depend on surface areas, base ambient temperature difference and Reynolds number. The base temperature for annular fins is
reduced by 30% when compared to fin with diameter 11mm due to increase in surface area about 40%. The base temperature for
annular fins is reduced by 10% when compared to fin with diameter of 31mm due to decrease in surface area about 41%. It is
also observed that at higher heat load i.e., 45W, the overall fin efficiency of annular fins is increased by 44% and 8% compared to
fin with diameter of 11mm and 31mm respectively. At higher Reynolds number range 800-2000, heat transfer rate increases in
annular fins due to more number of air molecules get in contact with the heated surface
The heat transfer duty or thermal performance of heat exchangers can be improved by heat transfer
enhancement techniques. Coiled wire insert has been used as one of the passive heat transfer enhancement
techniques and are the most widely used tubes in several heat transfer applications, for example, heat recovery
processes, air conditioning and refrigeration systems, chemical reactors, food and dairy processes, Thermal
Power plants, radiators for space vehicles, automobiles etc. These techniques broadly are of three types viz.
passive, active and compound techniques. The present paper is a review of the passive augmentation techniques
used in the recent past.
MERKELS METHOD FOR DESIGNING INDUCED DRAFT COOLING TOWERIAEME Publication
In general, cooling towers are used to dissipate process waste heat into the atmosphere. In this paper, induced draft cooling tower has been designed by simplified merkel’s method. The design of cooling tower is based on Merkel’s method. The t ower characteristic is determined by the ratio of range and log-mean-enthalpy difference. Optimization of the operating conditions for cooling tower applications in cooling water is extremely significant in order to get the most energy efficient operating point for these systems. A simple algebraic formula is used to calculate the optimum water-to-air flow rate. Merkel’s method is the most widely accepted theory for cooling tower calculations. It combines equations for heat and water vapor transfer. The objective of this paper is to present the design procedure of counter – flow cooling towers in a simplified manner
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Abstract: Heat pipe are high-efficient heat transfer devices and have been widely applied in various thermal systems. Since heat pipe utilize the phase change of the working fluid to transport the heat, the selection of working fluid is of essential importance to promote the thermal performance of heat pipe. Owing to the heat transfer enhancement effect of nanofluid in the single phase and phase change heat transfer, some researchers have applied various nanofluids in heat pipe as the working fluids to enhance their heat transfer performance.
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
An experimental investigation of annular fins under forced convectioneSAT Journals
Abstract
Heat transfer characteristics under forced convection are investigated experimentally by varying parameters like surface area,
base-to-ambient temperature difference and Reynolds number. To investigate the performance of fins experimentally, fins made of
aluminium (high thermal conductivity) are taken. For varying the surface area fin with 11 mm diameter without circumferential
fins, fin with 31 mm diameter and annular fins of 31 mm diameter are taken as specimens. Base to ambient temperature difference
is varied with the aid of dimmerstat ranging from 25W to 45W. Reynolds number is also varied by varying the velocities of air.
Velocities are varied by the aid of fan. Then these fins are tested under different load conditions, different Reynolds number by
varying the surface area of fins increase the rate of heat transfer. With the variation of relevant parameters under forced
convection heat transfer rates are analyzed experimentally. Experiments are conducted by using the annular fins, fin with
diameter 11mm without circumferential fins and fin with diameter 31mm at different Reynolds number and loads under forced
convection and comparison is made between fins. Experimental results shows that forced convection heat transfer rate from fins
depend on surface areas, base ambient temperature difference and Reynolds number. The base temperature for annular fins is
reduced by 30% when compared to fin with diameter 11mm due to increase in surface area about 40%. The base temperature for
annular fins is reduced by 10% when compared to fin with diameter of 31mm due to decrease in surface area about 41%. It is
also observed that at higher heat load i.e., 45W, the overall fin efficiency of annular fins is increased by 44% and 8% compared to
fin with diameter of 11mm and 31mm respectively. At higher Reynolds number range 800-2000, heat transfer rate increases in
annular fins due to more number of air molecules get in contact with the heated surface
The heat transfer duty or thermal performance of heat exchangers can be improved by heat transfer
enhancement techniques. Coiled wire insert has been used as one of the passive heat transfer enhancement
techniques and are the most widely used tubes in several heat transfer applications, for example, heat recovery
processes, air conditioning and refrigeration systems, chemical reactors, food and dairy processes, Thermal
Power plants, radiators for space vehicles, automobiles etc. These techniques broadly are of three types viz.
passive, active and compound techniques. The present paper is a review of the passive augmentation techniques
used in the recent past.
experimental investigation of heat transfer intensification of pin fins under...INFOGAIN PUBLICATION
Recent development era in technology has huge requirement of high performance lightweight, and compact heat transfer equipment. To accomplish this demand fins are widely used as effective elements for heat transfer enhancement. One of the commonly used heat exchanger fins is the pin fin which offers an economical and trouble free solution in many situations. This is more important in cooling of air conditioning equipment, thermal power plants, gas turbine blade, aerospace industry, combustion chamber liners, and biomedical devices, electrical and electronic component. Therefore now a day’s industries are utilizing thermal system with pin fins and analyse the various influencing parameters on performance of pin fin of different geometry under force convection. The turbulence occurred due to these techniques are good enough to enhance heat transfer rate. This article is focused on comprehensive review of work carried out in this technology.
DESIGN, ANALYSIS AND PERFORMANCE INVESTIGATION OF HEAT EXTRACTION UNIT USING ...Journal For Research
Over the last years, there has been growing interest in applying new technologies to improve the heat transfer from the various heat sources such as geothermal energy, power plants, diesel engines, automobiles and other industrial heat-generating process. The heat transfer enhancement by means of extended surface type heat exchanger is well established technology and at present being adopted by most of the waste heat recovery system. Different types of heat transfer enhancement techniques using fins are available in extended surface type heat exchanger but each of this technique having different heat transfer enhancement ratio. Different researchers have analyzed the effect of fin geometry and combination of fins on heat transfer enhancement technique. In present research, find out the effect of fins on heat transfer augmentation or heat transfer coefficient for extracting heat from various waste heat sources.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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.
In day-to-day life, we come across many processes where we see the usage of heat exchangers. Some
examples where heat exchangers are extensively utilized are air conditioning plants, thermal power plants, food
processing plants etc. The basic requirement in these industries is to utilize the heat energy used in the heat
exchangers efficiently. This can be done either by developing new designs that are energy efficient or by
modifying the present designs in such a manner that they give better performance under the same working
conditions. Hence, heat exchangers that would provide more heat transfer at the minimum size and cost are
requirement of the present industries. Hence they use the various heat transfer technique for enhance the heat
transfer rate. In this paper review of research work in last decade on heat transfer enhancement.
Similar to Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method (20)
An Examination of Effectuation Dimension as Financing Practice of Small and M...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Does Goods and Services Tax (GST) Leads to Indian Economic Development?iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Childhood Factors that influence success in later lifeiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Emotional Intelligence and Work Performance Relationship: A Study on Sales Pe...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Customer’s Acceptance of Internet Banking in Dubaiiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A Study of Employee Satisfaction relating to Job Security & Working Hours amo...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Consumer Perspectives on Brand Preference: A Choice Based Model Approachiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Student`S Approach towards Social Network Sitesiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Broadcast Management in Nigeria: The systems approach as an imperativeiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A Study on Retailer’s Perception on Soya Products with Special Reference to T...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A Study Factors Influence on Organisation Citizenship Behaviour in Corporate ...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Consumers’ Behaviour on Sony Xperia: A Case Study on Bangladeshiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Design of a Balanced Scorecard on Nonprofit Organizations (Study on Yayasan P...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Public Sector Reforms and Outsourcing Services in Nigeria: An Empirical Evalu...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Media Innovations and its Impact on Brand awareness & Considerationiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Customer experience in supermarkets and hypermarkets – A comparative studyiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
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Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
1. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 6 Ver. II (Nov. - Dec. 2015), PP 48-53
www.iosrjournals.org
DOI: 10.9790/1684-12624853 www.iosrjournals.org 48 | Page
Numerical and Experimental Investigation Plane Fin with the
Help of Passive Augmentation Method
1
Mayank Uniyal, 2
Kalpit Joshi
1
Assistant professor, 2
M.tech student
Abstract: As we know that fins are basically a extended surface which is use to increase the heat transfer rate,
this is basically a secondary surface mounted on primary surface to augment heat transfer from it . To dissipate
heat at faster rate, different heat transfer enhancement methods have been suggested in literature. Active and
passive heat transfer techniques are commonly employed for heat transfer augmentation in fluids.
Recent development in technology has led to demand for high performance lightweight, and compact heat
transfer equipment. To provide accommodation with this demand, finned surface are usually used to increase
rate of heat transfer. The excessive heat must be dissipated to the surrounding for smooth functioning of system.
This is more important in cooling of gas turbine blade, thermal power plants, air conditioning equipment and
electrical / electronic component. This component is getting more compacting size, which generates heat
continuously. This excessive heat will reduce the life of component. To overcome this problem there is need of
effective cooling system. Therefore now a day’s industries are utilizing thermal system such as ribs, fins, baffles
etc. The turbulence occurred due to these passive techniques are good enough to increase rate of heat transfer.
Our project is an extension in this direction to analysis the heat augmentation capacity of rectangular heat fin
array.
Keywords: Extended surfaces, heat exchangers, passive techniques, heat transfer enhancement, free and
forced convection.
I. Introduction
Heat transfer inside flow passages can be enhanced by using passive surface modifications such as rib
tabulators, protrusions, pin fins, and dimples. These heat transfer enhancement techniques have practical.
Application for internal cooling of turbine airfoils, combustion chamber liners and electronics cooling devices,
biomedical devices and heat exchangers. The heat transfer can be increased by the following different
Augmentation Techniques.
1.1. Types Of Augmentation Techniques: -
They are broadly classified into three different categories:
(i) Passive Techniques
(ii) Active Techniques
(iii) Compound Techniques
A. Passive Techniques: - These techniques generally use surface or geometrical modifications to the flow
channel by incorporating inserts or additional devices. They promote higher heat transfer coefficients by
disturbing or altering the existing flow behavior (except for extended surfaces) which also leads to increase in
the pressure drop. In case of extended surfaces, effective heat transfer area on the side of the extended surface is
increased. Passive techniques hold the advantage over the active techniques as they do not require any direct
input of external power. These techniques do not require any direct input of external power; rather they use it
from the system itself which ultimately leads to an increase in fluid pressure drop. They generally use surface or
geometrical modifications to the flow channel by incorporating inserts or additional devices. They promote
higher heat transfer coefficients by disturbing or altering the existing flow behavior except for extended
surfaces.
B. Active Techniques: - In comparison to the passive techniques, these techniques have not shown These
techniques are more complex from the use and design point of view as the method requires some external power
input to cause the desired flow modification and improvement in the rate of heat transfer. It finds limited
application because of the need of external power in many practical much potential as it is difficult to provide
external power input in many cases. In these cases, external power is used to facilitate the desired flow
modification and the concomitant improvement in the rate of heat transfer.
C. Compound Techniques: - A compound augmentation technique is the one where more than one of the
above mentioned techniques is used in combination with the purpose of further improving the thermo-hydraulic
performance of a heat exchanger. When any two or more of these techniques are employed simultaneously to
2. Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
DOI: 10.9790/1684-12624853 www.iosrjournals.org 49 | Page
obtain enhancement in heat transfer that is greater than that produced by either of them when used individually,
is termed as compound enhancement. This technique involves complex design and hence has limited
applications.
II. Heat Fin
Many engineering systems during their operation generate heat. If this generated heat is not dissipated
rapidly to its surrounding atmosphere, this may cause rise in temperature of the system components. This by-
product cause serious overheating problems in system and leads to system failure, so the generated heat within
the system must be rejected to its surrounding to maintain the system at recommended temperature for its
efficient working. The techniques used in the cooling of high power density electronic devices vary widely,
depending on the application and the required cooling capacity. The heat generated by the electronic
components has to pass through a complex network of thermal resistances to the environment. Passive cooling
techniques found more efficient and economic for electronics component. Using fins is one of the most
inexpensive and common ways to dissipate unwanted heat and it has been successfully used for many
engineering applications. Fins come in various shapes; such as rectangular, circular, pin fin rectangular, pin fin
triangular etc. Rectangular fins are the most popular fin type because of their low production costs and high
thermal effectiveness. Study of influence of geometric parameters viz. fin length, fin height, fin spacing over
heat dissipation found important.
A heat fin transfers thermal energy from a higher temperature device to a lower temperature fluid
medium. The fluid medium is frequently air, but can also be water, refrigerants or oil. If the fluid medium is
water, the heat fin is frequently called a cold plate. In thermodynamics a heat fin is a heat reservoir that can
absorb an arbitrary amount of heat without significantly changing temperature. Practical heat fins for electronic
devices must have a temperature higher than the surroundings to transfer heat by convection, radiation, and
conduction. The power supplies of electronics are not 100% efficient, so extra heat is produced that may be
detrimental to the function of the device. As such, a heat fin is included in the design to disperse heat to improve
efficient energy use.
To understand the principle of a heat sink, consider Fourier's law of heat conduction. Fourier's law of
heat conduction, simplified to a one-dimensional form in the x-direction, shows that when there is a temperature
gradient in a body, heat will be transferred from the higher temperature region to the lower temperature region.
The rate at which heat is transferred by conduction, qk, is proportional to the product of the temperature gradient
and the cross-sectional area through which heat is transferred.
𝐪𝐤 = −𝐤𝐀
𝐝𝐓
𝐝𝐱
A variety of extended surfaces like the plain trapezoidal, plain rectangular can perform such function,
and we have included the offset strip fin geometry in our present work.
2.1 Types Of Plate Fins
2.1 Plain Fins: -
Plain fins are by far the most common of all compact cores or surfaces used in compact heat
exchangers. The plain- fin surfaces are characterized by long uninterrupted flow passages, with performance
similar to that obtained inside long circular tubes (Kays and London, 1984).
Plain fins are used in those applications where core pressure drop is critical. Their application range
from aerospace air conditioning duties to oil refining (Hesselgreaves 2001), among many others. An heat
exchanger with plain fins requires a smaller flow frontal area than that with interrupted fins for specified
pressure drop, heat transfer and mass flow rate. Of course, the required passage length is higher leading to a
3. Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
DOI: 10.9790/1684-12624853 www.iosrjournals.org 50 | Page
larger overall volume. The heat transfer enhancement achieved with plain fins results mainly from increased
area density, rather than any substantial rise in the heat transfer coefficient (Brockmeier, et al. 1993).
III. Passive Heat Transfer Techniques Omproved By The Different Researchers
3.1 Jian Yang Min Zeng Qiuwang Wang, Akira Nakayama
The forced convective heat transfer in three-dimensional porous pin fin channels is numerically studied
in this paper. The Forchheimer–Brinkman extended Darcy model and two-equation energy model are adopted to
describe the flow and heat transfer in porous media. Air and water are employed as the cold fluids and the
effects of Reynolds number (Re), pore density (PPI) and pin fin form are studied in detail. 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 for both air and water cases. 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.
3.1.1 Physical model: „(a) porous pin fin heat sink and „(b) Representative computational domain
12
3.1.2 Different forms of porous pin fin cross-section: (a) circular Form (b) cubic form(c) long elliptic form, and
(d) short elliptic form
3.2 Markus R¨utten and Lars Krenkel
The main physical mechanisms causing the enhancement of heat transfer is the generation and
amplification of sufficiently strong longitudinal vortices which are interacting with the thermal boundary layer.
The stratification of the thermal boundary layer near the heated walls is disturbed by these vortices.
The convection of warmer fluid perpendicular to the heated wall and the mixing with colder fluid is intensified,
and, additionally, further external momentum is transported into the inner boundary layer region.
3.3 K.S Dhanawade, H. S. Dhanawade
The present paper reports, an experimental study to investigate the heat transfer enhancement in
rectangular fin arrays with circular perforation equipped on horizontal flat surface in horizontal rectangular duct.
The data used in performance analyses were obtained experimentally by varying flow, different heat inputs and
geometrical conditions. The experiment covered Reynolds number range from 3000-6000, based on the flow
4. Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
DOI: 10.9790/1684-12624853 www.iosrjournals.org 51 | Page
average inlet velocity and hydraulic diameter. Clearance ratio (C/H) 0.45, inter-fin spacing ratio (S/H) 0.22, duct
width 150mm, height100mm and fin size of both solid and perforated (weight reduction) were 100mm x 55mm
x 3mm. For various heat inputs and flow rates values of Reynolds and Nusselt number were obtained. The
results of perforated fin arrays have been compared with its external dimensionally equivalent solid fin arrays. It
shows that enhancement in heat transfer of perforated fin arrays than solid fin arrays.
IV. Experimental Analysis Of Heat Fins
5.1 parallel fin: -
5.1 Parallel Fin
Dimension
Length – 100 mm Breadth – 60 mm Thickness – 05 mm Convective heat transfer area – 6784
mm2
Material used – Aluminium
Thermal conductivity – 200 W/m-k
5.1.1 Observation Of Parallel Fin:
Heat Analysis of fin: -
Properties of air
Ts = 331 K,
T∞ = 311 K
Mean Temperature =
Ts+T∞
2
=
331+311
2
= 321 K
Properties of air at 321 K
ρ = 1.1614 Kg/m3
Cp = 1.007 KJ/Kg-K µ = 184.6 × 10-7
NS/m2
ʋ = 15.89 × 10-6
m2
/s
Kair = 26.3 × 10-3
W/m-K Pr = 0.707 d = 4A/p = 0.1125 m
Reynolds Number Re =
ρvd
µ
= 7.455× 105
Prandtl Number Pr =
µCp
Kair
=
184.6 × 10−7×1.007
26.3 × 10−3
= 0.707
The empirical relation for heat convective coefficient in forced convection is given by-
hd
Kair
= 0.023(Re) 0.8
(Pr) 0.4
Time
(min)
Voltage (V) Current
(mA)
Fin Temperature (0
c) Air Temperature (0
c) Air Velocity
(m/sec)
0 230 10 40.0 33.5 105
2 230 10 42.5 35.7 105
4 230 10 46.3 36.7 105
6 230 10 50.4 37.2 105
8 230 10 54.6 38.2 105
10 230 10 58.7 38.2 105
12 230 10 58.9 38.3 105
5. Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
DOI: 10.9790/1684-12624853 www.iosrjournals.org 52 | Page
By the above relation the heat convective coefficient (h) can be calculate
h=233.3 W/m2
-K
5.2 Cross Fin: -
5.2 Cross Fin
Dimensions: -
Length – 100 mm Breadth – 60 mm Thickness – 05 mm Convective heat transfer area – 11,824
mm2
Material used – Aluminium
Thermal conductivity – 200 W/m-K
5.2.1 Observation Of Cross Fin: -
Time (min) Voltage (V) Current (mA) Fin Temperature (0
c) Air Temperature (0
c) Air Velocity
(m/sec)
0 230 10 31.7 31.9 105
2 230 10 40.0 35.1 105
4 230 10 42.8 36.0 105
6 230 10 43.8 37.1 105
8 230 10 44.3 38.2 105
10 230 10 45.5 39.3 105
12 230 10 46.1 40.3 105
5.1.2 Table Of Observation Of Cross Fin
Heat Analysis of fin: -
Properties of air
Ts = 319.1 K, T∞ = 313.1 K
Mean Temperature =
Ts+T∞
2
=
319.1+313.1
2
= 316.1 K
Properties of air at 316.1 K
ρ = 1.2780 Kg/m3
Cp = 1.0065 KJ/Kg-K µ = 172.1 × 10-7
NS/m2
ʋ = 13.665 × 10-6
m2
/s
Kair = 24.3 × 10-3
W/m-K Pr = 0.707 d = 4A/p = 0.1125 m
Reynolds Number Re =
ρvd
µ
=
1.2780×105×0.1125
172.1×10−7
= 8.6× 105
Prandtl Number Pr =
µCp
Kair
=
172.1 × 10−7×1.0065
24.3 × 10−3
= 0.71
The empirical relation for heat convective coefficient in forced convection is given by-
hd
Kair
= 0.023(Re) 0.8
(Pr) 0.4
By the above relation the heat convective coefficient (h) can be calculate
h=242.58 w/ m2-k
6. Numerical and Experimental Investigation Plane Fin with the Help of Passive Augmentation Method
DOI: 10.9790/1684-12624853 www.iosrjournals.org 53 | Page
V. Result
Fin Single cut Double cut
Heat transfer coefficient 233.30 242.58
Double cut roughness is better than single cut fin. Disturbance in flow help to more increase the rate of
heat transfer.so using passive methods help to increase the rate of heat transfer with little change in geometry.
VI. Conclusion:
Many researchers are taking interest to enhance heat transfer rate with passive methods. dimple,
protrude and rough surfaces etc passive methods are used in heat exchangers, air heaters and heat sinks to
enhance heat transfer. Passive methods can easily manufacture and applicable too. We need to work on
compound technique, surly it will augment more heat transfer than other methods.
References
[1] Jian Yang Min Zeng Qiuwang Wang, Akira Nakayama “Forced Convection Heat Transfer Enhancement by Porous Pin Fins in
Rectangular Channels” IEEE transactions on components and packaging technologies , vol. 27, no. 4, December 2004
[2] “Heat Transfer Enhancement by Using Vortex Generators” 5th European Congress on Computational Methods in Applied Sciences
and Engineering (ECCOMAS 2008) June 30 –July 5, 2008 Venice, Italy
[3] K. H. Dhanawade, H. S. Dhanawade“Enhancement of Forced Convection Heat Transfer from Fin Arrays with Circular Perforation”
IEEE 2010.
[4] M.J. Sable, S.J. Jagtap , P.S. Patil , P.R. Baviskar & S.B. Barve“enhancement of natural convection heat transfer on vertical heated
plate by multiple v-fin array” IJRRAS 5 (2) ● November 2010.
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Taiwan 300.
[7] Sandeep S. Kore, Satishchandra V. Joshi, Narayan K.Sane “experimental investigations of heat transfer enhancement from dimpled
surface in a channel” ISSN : 0975-5462 Vol. 3 No. 8 August 2011
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[9] A. Vikrant Katekar B. Ankur VithalKar C. Bhojraj Kale “enhancement of convective heat transfer coefficient in solar air heater of
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