Experimental and numerical investigation of pressure drop and heat transfer coefficient in converging–diverging microchannel heat sink

Chakravarthii, M. K. Dheepan; Devarajan, Mutharasu; Shanmugan, S.

doi:10.1007/s00231-017-1978-7

Cited by 19 publications

(1 citation statement)

References 21 publications

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“…Therefore, studying the effect of geometrical configuration on the nature of the flow is relevant. Compared to other varying cross-section microchannels, diverging-converging microchannels have received less attention [11,[29][30][31]. Further, it is interesting to see whether the flow properties in microchannel with diverging-converging configuration are dependent on aspect ratios, diverging-converging angles and Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical study of flow physics of single-phase laminar flow through diamond (diverging–converging) microchannel

2019

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Diamond microchannel is a non-uniform microchannel that has both diverging and converging flow passages of certain lengths. In this work, three-dimensional simulation and analysis of single-phase laminar fluid flow through diamond microchannel has been carried out for different geometrical and flow parameters. Water is taken as the working fluid. The pressure drop exhibits linear dependence on mass flow rate and varies inversely with inlet angle, width ratio, and hydraulic diameter, which is similar to a straight channel. A non-linear behavior is observed for microchannel with higher inlet angle and higher width ratio, which suggests flow transition because of the presence of recirculation and separation zones. The inlet angle and width ratio are identified as the critical parameters that characterize the flow. An appropriate length scale is defined to make the overall pressure drop of diamond microchannel same as an equivalent uniform microchannel. This characteristic length located at 1/7th of the total length of the microchannel from the inlet makes the pressure drop of microchannel independent of its geometric and flow parameters. The local flow behavior has been further analyzed with the help of pressure, velocity and shear stress profiles. These results are significant due to the relevance of diamond shape microchannel in the design of micromixers, microreactors, and micropumps.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical study of flow physics of single-phase laminar flow through diamond (diverging–converging) microchannel

2019

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The role of microchannel geometry selection on heat transfer enhancement in heat sinks: A review

2021

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Extensive research has been carried out by researchers for improving the thermal efficiency of the microchannel. There are various types of methodologies that have been proposed by authors for different geometry and fluid flow. The use of microchannel in the miniature heat exchangers and microchannel heat sink (MCHS) have taken the science of heat transfer to an another level for which the field of electronic device cooling, aerospace applications, automobile sectors, biomedical engineering, and chemical engineering sectors are being keen toward further development of the technology. Since 3 decades, the microchannel has been tested numerically, experimentally, and analytically for establishing the theories of hydraulic and thermal efficiency during fluid flow. Improper geometry selection of microchannel may lead to carry various losses such as pressure drop, friction factor, wall shear stress, and temperature jump. Available investigations and results have been reviewed immensely in this paper to give a clear prospective for further research in selecting a proper channel geometry.

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Experimental study on the effect of shape on the boiling flow and heat transfer characteristics of different pin-fin microchannels

et al. 2021

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Experimental and numerical investigation of pressure drop and heat transfer coefficient in converging–diverging microchannel heat sink

Cited by 19 publications

References 21 publications

Three-dimensional numerical study of flow physics of single-phase laminar flow through diamond (diverging–converging) microchannel

Three-dimensional numerical study of flow physics of single-phase laminar flow through diamond (diverging–converging) microchannel

The role of microchannel geometry selection on heat transfer enhancement in heat sinks: A review

Experimental study on the effect of shape on the boiling flow and heat transfer characteristics of different pin-fin microchannels

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