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research-article

Numerical study on mitigation of flow maldistribution in parallel microchannel heat sink: channels variable width vs. variable height approach

[+] Author and Article Information
Ritunesh Kumar

Mechanical Engineering Department, Indian Institute of Technology Indore, Khandwa Road, Simrol, India-453552
ritunesh@iiti.ac.in

Gurjeet Singh

Mechanical Engineering Department, Indian Institute of Technology Indore, Khandwa Road, Simrol, India-453552
phd1401103004@iiti.ac.in

Dariusz Mikielewicz

Gdansk University of Technology, Faculty of Mechanical Engineering, ul.Narutowicza 11/12, 80-233 Gdansk, Poland
dariusz.mikielewicz@pg.edu.pl

1Corresponding author.

ASME doi:10.1115/1.4043158 History: Received November 29, 2018; Revised March 05, 2019

Abstract

Microchannel heat sink on one hand enjoys benefits of intensified several folds heat transfer performance but on other hand has to suffer aggravated form of trifling limitations associated with imperfect hydrodynamics and heat transfer behavior. Flow maldistribution is one of such limitation that exaggerates temperature non-uniformity across parallel microchannels leading to increase in maximum base temperature. Recently, variable width channels approach had been proposed by current authors to mitigate the flow maldistribution in parallel MCHS and in current numerical study variable height approach is opted for flow maldistribution mitigation. It is found that VHMCHS approach mitigates flow maldistribution rapidly in comparison to VWMCHS approach, almost fifty percent computational time can be saved by VHMCHS approach. Average fluid-solid interface temperature fluctuation across parallel microchannels reduces 3.3oC by VHMCHS in comparison to VWMCHS approach. The maximum and average temperatures of the base of the heat sink are further reduced by 5.1°C and 2.7°C respectively for the VHMCHS. It is found that overall heat transfer performance of the heat sink improves further by 3.8% and 5.1% for the VWMCHS and VHMCHS respectively. The pressure drop penalty of the VHMCHS is found 7.2% higher than VWMCHS.

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