An Experimental Study Of A Pin Fin Heat Exchanger
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An Experimental Study Of A Pin Fin Heat Exchanger
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Author : David Ramthun
language : en
Publisher:
Release Date : 2003-06-01
An Experimental Study Of A Pin Fin Heat Exchanger written by David Ramthun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-06-01 with categories.
A detailed experimental study has been carried out on the heat transfer and pressure drop characteristics of a compact heat exchanger with pin fins, A modular wind- tunnel with a rectangular cross-section duct-flow area was constructed that would accommodate the heat exchanger test section with varying pin designs. The flow in the tunnel was achieved through a suction-type blower, and a leading entrance length section was added to achieve predictable flow conditions into the heat exchanger test section. The rig was comprehensively instrumented to provide all desired thermal and flow data. The results from this study provide useful empirical data to validate ongoing numerical studies of such heat exchanger designs.
Experimental Study Of Micro Pin Fin Heat Sinks And Supercritical Carbon Dioxide Microchannel Heat Exchanger
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Author : Cameron J. Naderi
language : en
Publisher:
Release Date : 2017
Experimental Study Of Micro Pin Fin Heat Sinks And Supercritical Carbon Dioxide Microchannel Heat Exchanger written by Cameron J. Naderi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Microchannels in the application of heat sinks and heat exchangers play an important role in the field of heat transfer as the ever-increasing need for smaller components becomes apparent. Microchannels, although demanding larger pumping power in the systems they are integrated in, provide the superseding benefit of efficient heat transfer in a smaller and more cost-effective product when compared to larger scale heat exchange devices. This thesis focused on two areas relating to the study of microchannels. The first explored the performance of micro pin-fin heat sinks in quantitative studies of both the heat transfer and pressure drop of varying pin aspect and pitch ratios. Additionally, the study attempted to discover the effect of vortex shedding that occurs within the pin arrays of certain heat sinks and the geometric parameters that allow or prohibit its onset. The study found there to be a set of criteria for pin aspect and pitch ratios that would allow for vortex shedding, a flow feature that results in better heat transfer and lower pressure drop across the heat sink. The second topic examined in this thesis was the use of microchannels in a recuperator heat exchanger used in a supercritical carbon dioxide power generation cycle. A unit cell design of a heat exchanger was designed and tested for its heat transfer and pressure drop performance in order to provide results that would aid in designing a scaled-up version that would meet real-world demands. A viable design was created that could withstand conditions up to 90 ̊C and 120bar while also performing at 95% effectiveness.
Numerical And Experimental Study Of The Performance Of A Drop Shaped Pin Fin Heat Exchanger
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Author : Jihed Boulares
language : en
Publisher:
Release Date : 2003-06-01
Numerical And Experimental Study Of The Performance Of A Drop Shaped Pin Fin Heat Exchanger written by Jihed Boulares and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-06-01 with categories.
This research presents the results or a combined numerical and experimental study or heat transfer and pressure drop behavior in a compact heat exchanger (CHE) designed with drop-shaped pin tins. A numerical study using ANSYS was first conducted to select the optimum pin shape and configuration for the CHE. This was followed by an experimental study to validate the numerical model. The results indicate that the drop shaped pin tins yield a considerable improvement in heat transfer compared to circular pin tins tor the same pressure drop characteristics. This improvement is mainly due to the increased wetted surface area of the drop pins, and the delay in the flow separation as it passes the more streamlined drop shaped pin tins. The data and conclusions of this study can he used in heat exchanger design tor large heat flux cooling applications as in gas turbine blades, and high-power electronics.
An Experimental Study Of Pin Fin Heat Sinks And Determination Of End Wall Heat Transfer
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Author : Massimiliano Rizzi
language : en
Publisher:
Release Date : 2002
An Experimental Study Of Pin Fin Heat Sinks And Determination Of End Wall Heat Transfer written by Massimiliano Rizzi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Experimental Study Of Heat Transfer And Pressure Drop Over An Array Of Short Micro Pin Fins
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Author : Aditya Bhat
language : en
Publisher:
Release Date : 2015
Experimental Study Of Heat Transfer And Pressure Drop Over An Array Of Short Micro Pin Fins written by Aditya Bhat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Heat categories.
"Studies on thermal enhancement for electronic chips has been gaining prominence as increased transistor density in the chips calls for larger heat dissipation. Various enhancement techniques have been proposed ever since 1981, to enhance the heat dissipation from the chip surface. Micro pin fins have been gaining recognition as a highly favorable surface enhancement due to the design versatility it provides in the form of myriad geometric shapes and fin arrangements as opposed to convention microchannels. The micro pin fins however, present a larger pressure drop over the surface as compared to other conventional methods which reduces the thermal efficiency of the chip surface. To reduce the pressure drop associated with micro pin fins, short micro pin fins were proposed. A short micro pin fin arrangement is similar to micro pin fin arrays, with one change, in that short micro pin fins have a clearance between the fins and the top of the channel. The current study focusses on heat transfer and pressure drop over short micro pin fin arrays. Experimental studies were conducted over 10 mm × 10 mm with fin heights varying from 200 to 500 [microns] and clearance over the fins varying from 265 to 900 μm. Distilled water was used as the cooling medium. The heat transfer coefficient and pressure drop characteristics were evaluated at varying fin heights and varying clearance of the surfaces with an aim to identify optimum fin height and clearance parameters. The heat transfer coefficient and pressure drop data obtained from experiments were also evaluated with the correlation proposed by Tullius et al. Data showed that the highest heat transfer coefficient was observed for fins with the largest fin height. When fin clearance was evaluated for its effect on heat transfer coefficient, a hint of mixing phenomenon leading to enhancement in heat transfer coefficient was observed at higher clearance values. A higher pressure drop was observed at longer fins owing to the increased friction factor at the fin walls. The highest pressure drop of over 100 kPa was observed for a chip gasket combination which consisted of the longest fins with the least amount of clearance. It was also observed that the Nusselt number and Pressure drop correlations proposed by Tullius et al was not able to accurately predict the experimental data. However, the correlation did show the same trend as the experimental data, hence, the present correlation could be modified or used as a basis for new correlations of Nusselt number and friction factor."--Abstract.
Numerical And Experimental Analysis Of The Performance Of Staggered Short Pin Fin Heat Exchangers
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Author : Leonard J. Hamilton
language : en
Publisher:
Release Date : 2003-06-01
Numerical And Experimental Analysis Of The Performance Of Staggered Short Pin Fin Heat Exchangers written by Leonard J. Hamilton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-06-01 with categories.
A three dimensional finite element based numerical model was used to analyze the heat transfer characteristics of various staggered short pin-fin array heat exchangers. The simulation was validated against data from an experimental rig as well as historical data and then used to estimate the heat transfer coefficient and pressure drop for a wide range of Reynolds numbers for circular and airfoil-shaped pin fins. Circular pin configuration variations included changes in pin spacing, axial pitch and pin height ratio. Airfoil pin variations also included changes in length and aspect ratio. Correlations for Nusselt number and friction factor were developed. Using established performance metrics optimum configurations for both pin shapes were determined. The optimum airfoil pin array was shown to match the heat transfer rates obtained by the optimum circular pin configuration while incurring less than one third the specific fluid friction power loss. The results from this study would be of direct value in the design of a shroud enclosed heat exchanger concept being proposed for turbine blade cooling, or for cooling of high power electronic components, or in other high heat flux dissipation applications requiring a low- profile, high area-density based micro-heat exchanger design.
An Experimental Study Of The Effects Of Rotation On Convective Heat Transfer In Smooth And Pin Fin Ducts Of Narrow Cross Section
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Author : Fred Thomas Willett (Jr.)
language : en
Publisher:
Release Date : 1999
An Experimental Study Of The Effects Of Rotation On Convective Heat Transfer In Smooth And Pin Fin Ducts Of Narrow Cross Section written by Fred Thomas Willett (Jr.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
An Experimental Study Of Endwall Heat Transfer Enhancement For Flow Past Staggered Non Conducting Pin Fin Arrays
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Author : Vamsee Satish Achanta
language : en
Publisher:
Release Date : 2004
An Experimental Study Of Endwall Heat Transfer Enhancement For Flow Past Staggered Non Conducting Pin Fin Arrays written by Vamsee Satish Achanta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
In this work, we study the enhanced endwall heat transfer for flow past non conducting pin fin arrays. The aim is to resolve the controversy over the heat transfer that is taking place from the endwall and the pin surface. Various parameters were studied and results were obtained. Our results are found to be consistent with some of the results that have been previously published. The results were surprisingly found to be dependent on the height of the pin fin.
Experimental Study Of Flow And Local Mass Heat Transfer From Single Short Cylinders And Arrays Of Short Pin Fins In Crossflow
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Author : Seung-Bae Chen
language : en
Publisher:
Release Date : 1996
Experimental Study Of Flow And Local Mass Heat Transfer From Single Short Cylinders And Arrays Of Short Pin Fins In Crossflow written by Seung-Bae Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Experimental Evaluation Of Heat Flow Through Staggered Pin Fin Array By Forced Convection
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Author : Nicholson Anak Jambok
language : en
Publisher:
Release Date : 2012
Experimental Evaluation Of Heat Flow Through Staggered Pin Fin Array By Forced Convection written by Nicholson Anak Jambok and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Heat categories.
An experimental evaluation of heat flow through staggered pin fin array by forced convection was set up in the thermodynamics laboratory for purpose of thesis study. All the main parameters that can significantly influence the heat transfer performance of staggered pin fin arrays have been examined thoroughly. An experimental set-up was designed to study the heat transfer performance inside the duct channel. The material is used in laboratory is called mild steel and its fins assembly with the plate heater. The pin fins was cylindrical in shape. The total number of fin was 23 fins attached on the base of the plate heater. The length of the fin was 12 cm with the diameter of 1 cm. The base area covered 9.5 cm x 9.3 cm. The transverse pitch, longitudinal pitch, and the diagonal pitch were 2cm, 2cm, and 1.5 cm respectively. Air was used as a working fluid in the experiment. Reynolds Number, Nusselt Number, and the Prandtl Number are the equations that use in heat transfer calculation. The result of findings will be taken into further experimentation through some critical results, discussion and conclusion.