This document describes a computational fluid dynamics (CFD) analysis of jet impingement cooling for a microcontroller. It includes the objective of evaluating the thermal performance of the microcontroller with and without jet impingement under different operating conditions. It presents the CAD model, mesh generation, validation steps, and results showing temperature distribution is lower with jet impingement. References on jet impingement cooling and CFD analysis are also provided.
Ravish Vinze obtained a PhD in Mechanical Engineering from Defence Institute of Advanced Technology, specializing in heat transfer. His research focused on local heat transfer distribution from impinging circular air jets under varying conditions like jet temperature, nozzle profile, Reynolds number, and nozzle pressure ratios. Key findings included the effect of these parameters on heat transfer and flow physics. Current work at Saint Gobain Research India involves experimental evaluation of products' thermal performance. Publications include 9 international journal papers on topics like heat transfer from smooth and dimpled surfaces under single and multiple impinging jets.
Heat transfer enhancement_fusion reactor.pdfSandeepRimza1
jet impingement technique with a sectorial extended surface (SES) concept for the modular heliumcooled
divertor has been studied within the framework of the post ITER tokamak, at the Institute for
plasma research (IPR), INDIA. Experimental and numerical studies have been conducted to predict the
thermal-hydraulic performance of a finger-type divertor design with proposed SES. Critical thermal
hydraulic parameters, effective heat transfer coefficient and pressure loss have been measured in the
experiment for the reference divertor as well as for a divertor with SES. The experimental mock-ups are
made to full scale respecting Reynolds and Prandtl number similarities. Air is used as the simulant to
represent helium, which is used as the coolant in prototype. A novel heat concentrator has been
developed to simulate the high heat flux, by electrical heating.
HEAT TRANSFER DURING MULTI SWIRL JET IMPINGEMENT: EXPERIMENTATIONIAEME Publication
Of the Active Cooling Techniques, Jet impingement achieves high localized heat
transfer rates. Introduction of swirl is one of the methods of augmentation of heat
transfer rates. The current work aims at verifying the expression derived in our
previous work experimentally. Three cases, for which simulations were performed
previously, are executed. The required ducts are manufactured by additive
manufacturing. Thermistors are used for measuring temperatures. Anemometer is
used to monitor air flow rates. Smoke tests are executed to demonstrate the generation
of swirl and then experimentation is executed to study the heat transfer
characteristics. The experimental results are in agreement with those of simulation
results
Heat Transfer Enhancement through Liquid Jet ImpingementIRJET Journal
This document provides a literature review on experimental and computational studies of liquid jet impingement heat transfer. It summarizes various parameters that influence jet impingement heat transfer such as flow rate, nozzle size, inlet pressure, and working medium properties. It then reviews over 30 experimental and computational studies on topics like the effects of nozzle geometry, surface roughness, nanofluids, vortex generators, swirling jets, and more. The overall goal is to provide an overview of recent approaches to studying jet impingement heat transfer processes.
CFD Analysis of a W Ribbed Roughness Solar Air HeaterYogeshIJTSRD
Solar air heaters are used to heat up air which can be used for various purposes. Computational Fluid Dynamics CFD has proved to be a boon for researchers to estimate performance of any machine at design stage only. In the present work, a 3 dimensional CFD investigation has been completed of sun powered air radiator to ponder heat exchange and liquid stream conduct in a rectangular pipe of a sun oriented air warmer with one roughened divider having blend of round and square transverse wire rib harshness. The impact of Reynolds number, harshness tallness, unpleasantness pitch, relative unpleasantness pitch and relative harshness stature on the warmth exchange coefficient and rubbing factor have been considered. From the investigation it has been found that, W formed harshness gives better warmth exchange rate as contrast with the V rib unpleasantness under comparable working conditions. The most extreme estimation of Nusselt number for W formed harshness is acquired with the relative unpleasantness pitch P e of 10 past that it begins diminishing. Ram Bahor Prajapati | N. V. Saxena "CFD Analysis of a W-Ribbed Roughness Solar Air Heater" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd44964.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/44964/cfd-analysis-of-a-wribbed-roughness-solar-air-heater/ram-bahor-prajapati
Computational Fluid Dynamics (CFD) Analysis of Natural Convection of Converge...IJERA Editor
Computational Fluid Dynamics (CFD) analysis was carried out for the convergent-divergent fins arranged inline and staggered on the base plate as per the experimental setup provided in the technical paper [1]. This paper reports on the validation of results of modeling and simulation in CFD. The simulation was carried out using the ANSYS 12.0 as the CFD modeling software. The main objective of the CFD analysis was to calculate the temperature distribution on the surface of the base plate and surface of the convergent-divergent fins for the given inline and staggered arrangement of fins due to the effect of natural convection heat transfer for different heat power inputs, and also to compare the CFD results with the experimental results.
Enhancing Heat Transfer Efficiency: Nanofluid Integration in Diverse Systems ...IRJET Journal
This document discusses research on enhancing heat transfer efficiency through the integration of nanofluids in various systems and coiled heat exchangers. It investigates the effects of nanofluids on cooling towers, car radiators, refrigeration systems, and shell and helical coiled tube heat exchangers. The study models a double helix coiled tube heat exchanger using computational fluid dynamics and compares its performance when water and nanofluids are used. Nanofluids with 0.75% volume fraction and added surfactants for stability are tested. The results are analyzed based on heat transfer rate, effectiveness, and other thermal properties to evaluate the potential advantages of using hybrid nanofluids in coiled heat exchangers
The document describes an experimental and numerical study to enhance heat transfer on a heat exchanger using an air flow with water droplets and Al2O3/water nanofluid. The study used a test rig with an instrumented air duct to inject water droplets via nozzles toward a finned tube heat exchanger. Experiments tested different nozzle types, droplet locations, air/water flow rates and temperatures. Numerical analysis using ANSYS FLUENT modeled the governing equations to study parameter effects. Results showed maximum heat transfer enhancement of 45% occurred at a 2% nanofluid concentration with sprayed air, agreeing within 11% of experimental data.
Ravish Vinze obtained a PhD in Mechanical Engineering from Defence Institute of Advanced Technology, specializing in heat transfer. His research focused on local heat transfer distribution from impinging circular air jets under varying conditions like jet temperature, nozzle profile, Reynolds number, and nozzle pressure ratios. Key findings included the effect of these parameters on heat transfer and flow physics. Current work at Saint Gobain Research India involves experimental evaluation of products' thermal performance. Publications include 9 international journal papers on topics like heat transfer from smooth and dimpled surfaces under single and multiple impinging jets.
Heat transfer enhancement_fusion reactor.pdfSandeepRimza1
jet impingement technique with a sectorial extended surface (SES) concept for the modular heliumcooled
divertor has been studied within the framework of the post ITER tokamak, at the Institute for
plasma research (IPR), INDIA. Experimental and numerical studies have been conducted to predict the
thermal-hydraulic performance of a finger-type divertor design with proposed SES. Critical thermal
hydraulic parameters, effective heat transfer coefficient and pressure loss have been measured in the
experiment for the reference divertor as well as for a divertor with SES. The experimental mock-ups are
made to full scale respecting Reynolds and Prandtl number similarities. Air is used as the simulant to
represent helium, which is used as the coolant in prototype. A novel heat concentrator has been
developed to simulate the high heat flux, by electrical heating.
HEAT TRANSFER DURING MULTI SWIRL JET IMPINGEMENT: EXPERIMENTATIONIAEME Publication
Of the Active Cooling Techniques, Jet impingement achieves high localized heat
transfer rates. Introduction of swirl is one of the methods of augmentation of heat
transfer rates. The current work aims at verifying the expression derived in our
previous work experimentally. Three cases, for which simulations were performed
previously, are executed. The required ducts are manufactured by additive
manufacturing. Thermistors are used for measuring temperatures. Anemometer is
used to monitor air flow rates. Smoke tests are executed to demonstrate the generation
of swirl and then experimentation is executed to study the heat transfer
characteristics. The experimental results are in agreement with those of simulation
results
Heat Transfer Enhancement through Liquid Jet ImpingementIRJET Journal
This document provides a literature review on experimental and computational studies of liquid jet impingement heat transfer. It summarizes various parameters that influence jet impingement heat transfer such as flow rate, nozzle size, inlet pressure, and working medium properties. It then reviews over 30 experimental and computational studies on topics like the effects of nozzle geometry, surface roughness, nanofluids, vortex generators, swirling jets, and more. The overall goal is to provide an overview of recent approaches to studying jet impingement heat transfer processes.
CFD Analysis of a W Ribbed Roughness Solar Air HeaterYogeshIJTSRD
Solar air heaters are used to heat up air which can be used for various purposes. Computational Fluid Dynamics CFD has proved to be a boon for researchers to estimate performance of any machine at design stage only. In the present work, a 3 dimensional CFD investigation has been completed of sun powered air radiator to ponder heat exchange and liquid stream conduct in a rectangular pipe of a sun oriented air warmer with one roughened divider having blend of round and square transverse wire rib harshness. The impact of Reynolds number, harshness tallness, unpleasantness pitch, relative unpleasantness pitch and relative harshness stature on the warmth exchange coefficient and rubbing factor have been considered. From the investigation it has been found that, W formed harshness gives better warmth exchange rate as contrast with the V rib unpleasantness under comparable working conditions. The most extreme estimation of Nusselt number for W formed harshness is acquired with the relative unpleasantness pitch P e of 10 past that it begins diminishing. Ram Bahor Prajapati | N. V. Saxena "CFD Analysis of a W-Ribbed Roughness Solar Air Heater" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd44964.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/44964/cfd-analysis-of-a-wribbed-roughness-solar-air-heater/ram-bahor-prajapati
Computational Fluid Dynamics (CFD) Analysis of Natural Convection of Converge...IJERA Editor
Computational Fluid Dynamics (CFD) analysis was carried out for the convergent-divergent fins arranged inline and staggered on the base plate as per the experimental setup provided in the technical paper [1]. This paper reports on the validation of results of modeling and simulation in CFD. The simulation was carried out using the ANSYS 12.0 as the CFD modeling software. The main objective of the CFD analysis was to calculate the temperature distribution on the surface of the base plate and surface of the convergent-divergent fins for the given inline and staggered arrangement of fins due to the effect of natural convection heat transfer for different heat power inputs, and also to compare the CFD results with the experimental results.
Enhancing Heat Transfer Efficiency: Nanofluid Integration in Diverse Systems ...IRJET Journal
This document discusses research on enhancing heat transfer efficiency through the integration of nanofluids in various systems and coiled heat exchangers. It investigates the effects of nanofluids on cooling towers, car radiators, refrigeration systems, and shell and helical coiled tube heat exchangers. The study models a double helix coiled tube heat exchanger using computational fluid dynamics and compares its performance when water and nanofluids are used. Nanofluids with 0.75% volume fraction and added surfactants for stability are tested. The results are analyzed based on heat transfer rate, effectiveness, and other thermal properties to evaluate the potential advantages of using hybrid nanofluids in coiled heat exchangers
The document describes an experimental and numerical study to enhance heat transfer on a heat exchanger using an air flow with water droplets and Al2O3/water nanofluid. The study used a test rig with an instrumented air duct to inject water droplets via nozzles toward a finned tube heat exchanger. Experiments tested different nozzle types, droplet locations, air/water flow rates and temperatures. Numerical analysis using ANSYS FLUENT modeled the governing equations to study parameter effects. Results showed maximum heat transfer enhancement of 45% occurred at a 2% nanofluid concentration with sprayed air, agreeing within 11% of experimental data.
This document summarizes a study that used computational fluid dynamics (CFD) to analyze heat transfer and flow characteristics in a solar air heater duct with ribbed surfaces. CFD simulations were performed for ducts with different rib configurations and Reynolds numbers. It was found that roughening the duct surface increased heat transfer but also increased friction losses. An optimal rib design was identified that provided maximum heat transfer enhancement with minimum pressure drop. Turbulence kinetic energy and intensity contours helped explain the increased turbulence near ribs that augmented heat transfer.
This document summarizes a numerical study on the characteristics of fluid flow and heat transfer in finned-tube heat exchangers. The study used computational fluid dynamics to analyze the effects of geometrical parameters like longitudinal pitch, transverse pitch, fin pitch, and wavy angle on heat transfer and pressure drop. It was found that increasing longitudinal and transverse pitch decreases thermal and hydraulic performance at low Reynolds numbers, while decreasing fin pitch significantly decreases both heat transfer and friction. The results reveal the influence of plain and wavy fin configurations on heat transfer and pressure drop performance.
CFD Simulation of Solar Air Heater having Inclined Discrete Rib Roughness wit...IRJET Journal
This document presents a computational fluid dynamics (CFD) simulation of a solar air heater duct with inclined discrete rib roughness and a staggered convex element. The study aims to develop a 3D CFD model to analyze heat transfer and fluid flow performance. Boundary conditions and material properties are defined. A mesh is generated and the RNG k-epsilon turbulence model is used. Results for velocity, temperature, and turbulent kinetic energy contours are presented along with charts showing variations in Nusselt number with Reynolds number and roughness pitch. Inclined discrete ribs with a staggered convex element are found to improve heat transfer in the solar air heater duct.
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.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
IRJET- A Reviw on Different Geometrical Fins and their Effect on Heat Tra...IRJET Journal
This document summarizes research on different geometric fin designs and their effect on heat transfer rates. It discusses how fins are used to increase surface area and improve heat transfer. Various fin geometries are described including longitudinal, radial, and pin fins. The performance of fins is evaluated using metrics like fin effectiveness and efficiency. Higher thermal conductivity materials, thinner fins with closer spacing, and conditions with lower heat transfer coefficients can improve fin performance. The document reviews several studies on topics like annular fins, dimpled pin fins, and modeling transient heat transfer in piston bore fins.
Numerical Predictions of Enhanced Impingement Jet Cooling with Ribs and Pins ...AZOJETE UNIMAID
This document presents a numerical study of enhanced impingement jet cooling with ribs and pins on target surfaces. Computational fluid dynamics (CFD) simulations were conducted using commercial codes to predict heat transfer with different obstacle wall configurations. The obstacles investigated were ribs and rectangular pin-fins in both co-flow and cross-flow alignments. The CFD predictions showed good agreement with previous experimental results and revealed that obstacles increase turbulence but also reduce the highest thermal gradients and downstream cross-flow.
IRJET- Jet Impingement Heat Transfer – A ReviewIRJET Journal
This document reviews research on jet impingement heat transfer. Jet impingement involves directing a jet of fluid at a surface and is an effective method for transferring heat. It has various industrial applications like cooling electronics and turbine blades. The review examines factors that influence heat transfer like jet geometry, cross flow effects, and frequency. It summarizes studies on single and multiple jet impingement, and the effects of parameters like Reynolds number. Conjugate heat transfer involving solid-fluid interaction is also discussed. The review provides an overview of research conducted on jet impingement heat transfer.
NUMERICAL ANALYSIS OF THERMAL PERFORMANCE OF LOUVER FINijiert bestjournal
Louver fins are widely used in heat exchanger for a utomotive applications such as radiator,intercooler,condenser,heater core etc. This study presents numerical analysis of effect of variation of louver pitch on heat transfer rate of louver fins. The three dimensional governing equations for fluid flow and heat transfe r are solved using ANSYS Fluent 14.5 for air flow of 4 m/s to 9 m/s. The variations of t emperature,pressure and heat transfer rate are studied using computational model. The enhancem ent of heat rate is observed as louver pitch is reduced.
In compact heat exchangers, thermal resistance is generally dominant on the air-side and may
account for 80% or more of the total thermal resistance. The air-side heat transfer surface area is 8 to
10 times larger than the water-side. Any improvement in the heat transfer on air-side therefore
improves the overall performance of the heat exchanger. Due to the high thermal resistance on the
air-side, the optimization of such fins is essential to increase the performance of the heat exchangers
which results in thermal systems enhancement. This helps to reduce CO2 emissions through a
reduction of mass and fuel consumption.
Optimization of louvered fin geometry in such heat exchangers is essential to increase the
heat transfer performance and reduce weight, packaging, and cost requirements. In this study deals
with Computational Fluid Dynamics (CFD) studies of the interactions between the air flow and
louvered fins which equipped the automotive heat exchangers is carried out. 3D numerical
simulation results is obtained by using the ANSYS Fluent 14.0 code and compared with
experimental data. Finally the effect of louver angle and louver pitch geometrical parameters, on
overall thermal hydraulic performances of louvered fins is studied.
This document discusses a numerical investigation of the geometry of louvered fins in automotive radiator compact heat exchangers. Computational fluid dynamics simulations were performed using ANSYS Fluent to analyze the interactions between air flow and louvered fins. The effects of louver angle and pitch on thermal hydraulic performance were studied. The results were compared to experimental data to validate the simulations. Optimization of louvered fin geometry can increase heat transfer performance while reducing weight and cost requirements.
IRJET- Numerical Study of Heat Transfer Characteristics on a Dimpled Surface ...IRJET Journal
This document summarizes previous research on using dimpled surfaces and pulsating jet impingement to improve heat transfer efficiency. It discusses how increasing the surface area through dimpling and optimizing frequency factors can increase heat transfer rates by up to 36%. Previous studies found that pulsating jets can enhance average heat transfer by 30-80% compared to steady jets, and that symmetrical jet pulsations without a phase difference marginally improve heat transfer while pulsations with a phase difference significantly enhance heat transfer around stagnation points. The document reviews various factors that influence heat transfer rates, such as Reynolds number, frequency, jet diameter, wall-to-nozzle spacing, and dimple geometry.
Computational Analysis of Heat sink or Extended SurfaceIRJET Journal
This document summarizes a study on the computational analysis of heat sinks using finite element analysis. Heat sinks with different fin configurations were modeled and analyzed using ANSYS Fluent software to evaluate heat transfer characteristics. The results were validated by comparing with previous studies and analytical solutions. Key findings include that increasing the number of fins and base-to-ambient temperature difference leads to higher convective heat transfer. An optimum fin spacing was identified that balances heat transfer and pressure drop, and this agreed with results from other studies. In conclusion, finite element analysis was found to be an effective method for evaluating heat transfer in heat sinks with different parameters.
CFD Analysis of Plate Fin Tube Heat Exchanger for Various Fin InclinationsIJERA Editor
ANSYS Fluent software is used for three dimensional CFD simulations to investigate heat transfer and fluid flow characteristics of six different fin angles with plain fin tube heat exchangers. The numerical simulation of the fin tube heat exchanger was performed by using a three dimensional numerical computation technique. Geometry of model is created and meshed by using ANSYS Workbench software. To solve the equation for the fluid flow and heat transfer analysis ANSYS FLUENT was used in the fin-tube heat exchanger. The fluid flow and heat transfer are simulated and result compared for both laminar and turbulent flow models k-epsilon and SST k-omega, with steady state solvers to calculate heat transfer, flow velocity and temperature fields of variable inclined fin angles (Ɵ = 00,100 , 200, 300, 400,500). Model is validate by comparing the simulated value of velocity, temperature and colburn factor with experimental and numerical results investigated by WANG [1] and GHORI KIRAR [10]. Reasonable agreement is found between the simulations and other results, and the ANSYS Fluent software is sufficient for simulating the flow fields in tube fin heat exchanger.
1) The document presents a computational fluid dynamics (CFD) analysis of a fin tube heat exchanger with rectangular winglet vortex generators.
2) It finds that adding vortex generators with angles of 30° and 45° can increase the overall Nusselt number (heat transfer coefficient) of the four row tubes by 18.68-46.38% and 38-55.86% respectively, but also increases pressure drop by 9.26-56.35% and 38-190.3%.
3) The study examines the effects of varying the winglet angle of attack, width, and placement location on heat transfer and fluid flow characteristics.
CFD Investigation of Compact Heat Exchanger Having Different Fins with Nanofl...IRJET Journal
This document summarizes research on using computational fluid dynamics (CFD) to investigate heat transfer in a compact heat exchanger with different fin types and titanium dioxide nanofluid. It discusses past research on various techniques for enhancing heat transfer and reducing pressure losses in heat exchangers. The document then outlines the objectives, methodology, and potential implications of research using CFD and limited experimental data to develop new heat transfer and pressure drop correlations for plain, offset strip, and wavy fins, which are common in applications like cryogenics and aerospace. These new correlations could provide more accurate and broadly applicable insights for heat exchanger design compared to existing correlations.
Performance Evaluation of U-Tube Pulsating Heat Pipe with Water-Based Nanofl...Adib Bin Rashid
The safety and efficiency of electronic equipment are becoming increasingly
critical as modern technologies progress significantly. The size of electronic
equipment is shrinking as it becomes more integrated. Hence, the heat load per
unit area increases, and the standard heat dissipation method may not fulfill their
requirements. Therefore, Pulsating Heat Pipe plays an essential role in efficiently
removing heat from congested surfaces to satisfy the requirement. To find
optimized parameters for a PHP, various investigations are conducted in this work
to help performance up-gradation of PHP. As the equipment gets smaller by size
and more heat has to be removed from smaller surfaces, nanoparticles can
significantly increase heat transfer performance. Furthermore, they can augment
the heat transfer ability of fluids inside the PHP by providing capillary wicking,
increased thermal effusivity, hydrodynamic instabilities, and structural disjoining
pressure. In this work, various experiment is carried out with water-based
Aluminum Oxide, Zinc Oxide, and Graphene Oxide Nanofluids. This work will help
upgrade PHP's performance and thus help enhance heat transfer performance
from smaller surfaces like Processor of Computers.
IRJET- Numerical Investigation of Heat Transfer Enhancement in Circular Pipe ...IRJET Journal
1. The document numerically investigates heat transfer enhancement in a circular pipe with various rib geometries, including flat, conical, and right angle ribs.
2. It uses computational fluid dynamics to model water flow through the pipe with Reynolds numbers from 5000 to 60000 and a constant heat flux of 50 W/cm2 applied to the pipe surface.
3. The results show that ribs on the inside of the pipe enhance turbulence in the flow and produce recirculation, disturbing the thermal boundary layer and increasing the rate of heat transfer through the pipe.
CFD Analysis of Heat Transfer in Helical CoilIRJET Journal
This document presents a computational fluid dynamics (CFD) analysis of heat transfer in a helical coil. The study aims to analyze the effect of coil diameter and inlet steam temperature on the heat transfer coefficient. CFD simulations are conducted for helical coils of different diameters with varying inlet steam temperatures and water flow rates. Results show that the heat transfer coefficient increases with increasing inlet steam temperature. Prior research on heat transfer in helical coils is also reviewed, focusing on studies utilizing CFD to analyze parameters like coil diameter, pitch, curvature ratio, and Reynolds number. The CFD methodology and boundary conditions used in this study are described. Contour plots of the simulated surface heat transfer coefficient are presented and discussed.
This document summarizes a study that uses computational fluid dynamics (CFD) to analyze the flow and heat transfer characteristics of different elliptical pin fin heat sink configurations. The study aims to examine the effects of elliptical pin fin design parameters on heat sink performance. CFD simulations are conducted using ANSYS Fluent software to compute the thermal resistance, heat transfer coefficient, and surface Nusselt number of plate fin and elliptical pin fin heat sinks. Results show that the elliptical pin fin heat sink has better heat transfer performance than the plate fin heat sink. Simulation results for thermal resistance and pressure drop are validated against experimental data from previous studies.
This document summarizes a study that used computational fluid dynamics (CFD) to analyze heat transfer and flow characteristics in a solar air heater duct with ribbed surfaces. CFD simulations were performed for ducts with different rib configurations and Reynolds numbers. It was found that roughening the duct surface increased heat transfer but also increased friction losses. An optimal rib design was identified that provided maximum heat transfer enhancement with minimum pressure drop. Turbulence kinetic energy and intensity contours helped explain the increased turbulence near ribs that augmented heat transfer.
This document summarizes a numerical study on the characteristics of fluid flow and heat transfer in finned-tube heat exchangers. The study used computational fluid dynamics to analyze the effects of geometrical parameters like longitudinal pitch, transverse pitch, fin pitch, and wavy angle on heat transfer and pressure drop. It was found that increasing longitudinal and transverse pitch decreases thermal and hydraulic performance at low Reynolds numbers, while decreasing fin pitch significantly decreases both heat transfer and friction. The results reveal the influence of plain and wavy fin configurations on heat transfer and pressure drop performance.
CFD Simulation of Solar Air Heater having Inclined Discrete Rib Roughness wit...IRJET Journal
This document presents a computational fluid dynamics (CFD) simulation of a solar air heater duct with inclined discrete rib roughness and a staggered convex element. The study aims to develop a 3D CFD model to analyze heat transfer and fluid flow performance. Boundary conditions and material properties are defined. A mesh is generated and the RNG k-epsilon turbulence model is used. Results for velocity, temperature, and turbulent kinetic energy contours are presented along with charts showing variations in Nusselt number with Reynolds number and roughness pitch. Inclined discrete ribs with a staggered convex element are found to improve heat transfer in the solar air heater duct.
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.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
IRJET- A Reviw on Different Geometrical Fins and their Effect on Heat Tra...IRJET Journal
This document summarizes research on different geometric fin designs and their effect on heat transfer rates. It discusses how fins are used to increase surface area and improve heat transfer. Various fin geometries are described including longitudinal, radial, and pin fins. The performance of fins is evaluated using metrics like fin effectiveness and efficiency. Higher thermal conductivity materials, thinner fins with closer spacing, and conditions with lower heat transfer coefficients can improve fin performance. The document reviews several studies on topics like annular fins, dimpled pin fins, and modeling transient heat transfer in piston bore fins.
Numerical Predictions of Enhanced Impingement Jet Cooling with Ribs and Pins ...AZOJETE UNIMAID
This document presents a numerical study of enhanced impingement jet cooling with ribs and pins on target surfaces. Computational fluid dynamics (CFD) simulations were conducted using commercial codes to predict heat transfer with different obstacle wall configurations. The obstacles investigated were ribs and rectangular pin-fins in both co-flow and cross-flow alignments. The CFD predictions showed good agreement with previous experimental results and revealed that obstacles increase turbulence but also reduce the highest thermal gradients and downstream cross-flow.
IRJET- Jet Impingement Heat Transfer – A ReviewIRJET Journal
This document reviews research on jet impingement heat transfer. Jet impingement involves directing a jet of fluid at a surface and is an effective method for transferring heat. It has various industrial applications like cooling electronics and turbine blades. The review examines factors that influence heat transfer like jet geometry, cross flow effects, and frequency. It summarizes studies on single and multiple jet impingement, and the effects of parameters like Reynolds number. Conjugate heat transfer involving solid-fluid interaction is also discussed. The review provides an overview of research conducted on jet impingement heat transfer.
NUMERICAL ANALYSIS OF THERMAL PERFORMANCE OF LOUVER FINijiert bestjournal
Louver fins are widely used in heat exchanger for a utomotive applications such as radiator,intercooler,condenser,heater core etc. This study presents numerical analysis of effect of variation of louver pitch on heat transfer rate of louver fins. The three dimensional governing equations for fluid flow and heat transfe r are solved using ANSYS Fluent 14.5 for air flow of 4 m/s to 9 m/s. The variations of t emperature,pressure and heat transfer rate are studied using computational model. The enhancem ent of heat rate is observed as louver pitch is reduced.
In compact heat exchangers, thermal resistance is generally dominant on the air-side and may
account for 80% or more of the total thermal resistance. The air-side heat transfer surface area is 8 to
10 times larger than the water-side. Any improvement in the heat transfer on air-side therefore
improves the overall performance of the heat exchanger. Due to the high thermal resistance on the
air-side, the optimization of such fins is essential to increase the performance of the heat exchangers
which results in thermal systems enhancement. This helps to reduce CO2 emissions through a
reduction of mass and fuel consumption.
Optimization of louvered fin geometry in such heat exchangers is essential to increase the
heat transfer performance and reduce weight, packaging, and cost requirements. In this study deals
with Computational Fluid Dynamics (CFD) studies of the interactions between the air flow and
louvered fins which equipped the automotive heat exchangers is carried out. 3D numerical
simulation results is obtained by using the ANSYS Fluent 14.0 code and compared with
experimental data. Finally the effect of louver angle and louver pitch geometrical parameters, on
overall thermal hydraulic performances of louvered fins is studied.
This document discusses a numerical investigation of the geometry of louvered fins in automotive radiator compact heat exchangers. Computational fluid dynamics simulations were performed using ANSYS Fluent to analyze the interactions between air flow and louvered fins. The effects of louver angle and pitch on thermal hydraulic performance were studied. The results were compared to experimental data to validate the simulations. Optimization of louvered fin geometry can increase heat transfer performance while reducing weight and cost requirements.
IRJET- Numerical Study of Heat Transfer Characteristics on a Dimpled Surface ...IRJET Journal
This document summarizes previous research on using dimpled surfaces and pulsating jet impingement to improve heat transfer efficiency. It discusses how increasing the surface area through dimpling and optimizing frequency factors can increase heat transfer rates by up to 36%. Previous studies found that pulsating jets can enhance average heat transfer by 30-80% compared to steady jets, and that symmetrical jet pulsations without a phase difference marginally improve heat transfer while pulsations with a phase difference significantly enhance heat transfer around stagnation points. The document reviews various factors that influence heat transfer rates, such as Reynolds number, frequency, jet diameter, wall-to-nozzle spacing, and dimple geometry.
Computational Analysis of Heat sink or Extended SurfaceIRJET Journal
This document summarizes a study on the computational analysis of heat sinks using finite element analysis. Heat sinks with different fin configurations were modeled and analyzed using ANSYS Fluent software to evaluate heat transfer characteristics. The results were validated by comparing with previous studies and analytical solutions. Key findings include that increasing the number of fins and base-to-ambient temperature difference leads to higher convective heat transfer. An optimum fin spacing was identified that balances heat transfer and pressure drop, and this agreed with results from other studies. In conclusion, finite element analysis was found to be an effective method for evaluating heat transfer in heat sinks with different parameters.
CFD Analysis of Plate Fin Tube Heat Exchanger for Various Fin InclinationsIJERA Editor
ANSYS Fluent software is used for three dimensional CFD simulations to investigate heat transfer and fluid flow characteristics of six different fin angles with plain fin tube heat exchangers. The numerical simulation of the fin tube heat exchanger was performed by using a three dimensional numerical computation technique. Geometry of model is created and meshed by using ANSYS Workbench software. To solve the equation for the fluid flow and heat transfer analysis ANSYS FLUENT was used in the fin-tube heat exchanger. The fluid flow and heat transfer are simulated and result compared for both laminar and turbulent flow models k-epsilon and SST k-omega, with steady state solvers to calculate heat transfer, flow velocity and temperature fields of variable inclined fin angles (Ɵ = 00,100 , 200, 300, 400,500). Model is validate by comparing the simulated value of velocity, temperature and colburn factor with experimental and numerical results investigated by WANG [1] and GHORI KIRAR [10]. Reasonable agreement is found between the simulations and other results, and the ANSYS Fluent software is sufficient for simulating the flow fields in tube fin heat exchanger.
1) The document presents a computational fluid dynamics (CFD) analysis of a fin tube heat exchanger with rectangular winglet vortex generators.
2) It finds that adding vortex generators with angles of 30° and 45° can increase the overall Nusselt number (heat transfer coefficient) of the four row tubes by 18.68-46.38% and 38-55.86% respectively, but also increases pressure drop by 9.26-56.35% and 38-190.3%.
3) The study examines the effects of varying the winglet angle of attack, width, and placement location on heat transfer and fluid flow characteristics.
CFD Investigation of Compact Heat Exchanger Having Different Fins with Nanofl...IRJET Journal
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Performance Evaluation of U-Tube Pulsating Heat Pipe with Water-Based Nanofl...Adib Bin Rashid
The safety and efficiency of electronic equipment are becoming increasingly
critical as modern technologies progress significantly. The size of electronic
equipment is shrinking as it becomes more integrated. Hence, the heat load per
unit area increases, and the standard heat dissipation method may not fulfill their
requirements. Therefore, Pulsating Heat Pipe plays an essential role in efficiently
removing heat from congested surfaces to satisfy the requirement. To find
optimized parameters for a PHP, various investigations are conducted in this work
to help performance up-gradation of PHP. As the equipment gets smaller by size
and more heat has to be removed from smaller surfaces, nanoparticles can
significantly increase heat transfer performance. Furthermore, they can augment
the heat transfer ability of fluids inside the PHP by providing capillary wicking,
increased thermal effusivity, hydrodynamic instabilities, and structural disjoining
pressure. In this work, various experiment is carried out with water-based
Aluminum Oxide, Zinc Oxide, and Graphene Oxide Nanofluids. This work will help
upgrade PHP's performance and thus help enhance heat transfer performance
from smaller surfaces like Processor of Computers.
IRJET- Numerical Investigation of Heat Transfer Enhancement in Circular Pipe ...IRJET Journal
1. The document numerically investigates heat transfer enhancement in a circular pipe with various rib geometries, including flat, conical, and right angle ribs.
2. It uses computational fluid dynamics to model water flow through the pipe with Reynolds numbers from 5000 to 60000 and a constant heat flux of 50 W/cm2 applied to the pipe surface.
3. The results show that ribs on the inside of the pipe enhance turbulence in the flow and produce recirculation, disturbing the thermal boundary layer and increasing the rate of heat transfer through the pipe.
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This document summarizes a study that uses computational fluid dynamics (CFD) to analyze the flow and heat transfer characteristics of different elliptical pin fin heat sink configurations. The study aims to examine the effects of elliptical pin fin design parameters on heat sink performance. CFD simulations are conducted using ANSYS Fluent software to compute the thermal resistance, heat transfer coefficient, and surface Nusselt number of plate fin and elliptical pin fin heat sinks. Results show that the elliptical pin fin heat sink has better heat transfer performance than the plate fin heat sink. Simulation results for thermal resistance and pressure drop are validated against experimental data from previous studies.
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2. DESIGN
AND CFD
ANALYSIS
Geometry of Heatsink (Natural Convection)
Number of Jets are clearly shown in this CAD model
above as green circles in front of the heatsink
5. DESIGN AND
CFD
ANALYSIS
FIGURE Temperature distribution of the heatsink with jet impingement
method(forced convection)
We can clearly observe
from the temperature
bar that after applying
jet there is a decrease
in mean temperature
about 17°C under the
optimal operating
conditions
6. UNDER SUPERVISION:
PROF.(DR) RADHEY
MISHRA
Ex-
Ex-DEAN(O&EA)
DESIGN
AND CFD
ANALYSIS
BY ANANAY
JOSHI
(2K20/ME/29
The figure represents the cooling near the
region(highest cooling region or the
lowest temperature region) close to jet air
has the lowest temperature while the
temperature far away from the jet is
higher.
7. Narumanchi et al [1] suggested that liquid jet impingement cooling has significant potential
for cooling power electronics, and further research is needed to optimize the design of cooling
systems and improve their performance. The model presented by Narumanchi et al. provides
a useful tool for predicting the performance of liquid jet impingement cooling systems and can
be used to guide the design of future cooling systems.[6] Kim et al [2] suggested that
dimpled surfaces, especially when used in conjunction with an impinging jet array, can
enhance the cooling performance for high-heat flux applications and further research is
needed to optimize the design of dimpled surfaces and impinging jet arrays to improve their
performance and efficiency. The study by Kim et al. provides useful insights into the effects of
various factors on cooling performance and can guide the design of future cooling systems.[7]
LITERATURE
REVIEW
8. Schmidt et al. (2000) [6] used high-speed visualization techniques to study the
dynamics of the boiling process and developed a heat transfer model to predict the
boiling heat transfer coefficient and their work provided valuable insights into the
complex physics of jet impingement boiling and demonstrated the importance of
understanding the underlying mechanisms for developing efficient cooling systems.[11]
Way et al. (2014) [7] provided valuable insights into the complex physics of jet
impingement boiling, and Way et al.'s work demonstrated the potential of submerged
liquid jet impingement with Microfinned enhanced surfaces for improving the cooling
performance of critical components. .[12]
LITERATURE
REVIEW
9. OBJECTIVE
1. To Quantitatively evaluate thermal performance of microcontroller L298N using CFD analysis under different
operating conditions, with and without jet impingement.
2. To Investigate impact of jet impingement on temperature distribution and heat dissipation of microcontroller
L298N, considering design parameters such as jet velocity, nozzle diameter, and impingement distance.
3. To Analyze thermal stress levels of microcontroller L298N with and without jet impingement to assess
effectiveness of jet impingement in reducing thermal stress and enhancing reliability.
4. To Develop CAD model of microcontroller L298N and integrate with CFD simulations to accurately predict
thermal behavior and performance under different cooling scenarios, including jet impingement.
5. To Compare and contrast thermal performance of microcontroller L298N with and without jet impingement
based on quantitative results from CFD simulations and experimental measurements, to determine optimal
cooling strategy using Machine learning and validate its results
12. VALIDATION
Measure of
Convergence
Figure Convergence of Solution is
must for Validating your CFD design
and Analysis
Above figure shows the convergence
after 10 iterations due to fine meshing
and use of supercomputer
13. NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
14. NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
15. NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
16. NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
17. CODE
BY ANANT VOHRA (2K2O/ME/32)
• NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
18. NUMERICAL INVESTIGATION OF LOCAL HEAT TRANSFER COEFFICIENT OF JET AIR AND
OTHER PARAMETERS USING C++ PROGRAMMING LANGUAGE
19. REFERENCES
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041301-8
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THE END