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Flow dynamics and heat transfer in partially porous microchannel heat sinks

Published online by Cambridge University Press:  26 July 2019

Mohammad Zargartalebi Open the ORCID record for Mohammad Zargartalebi [Opens in a new window]  and
Jalel Azaiez Open the ORCID record for Jalel Azaiez [Opens in a new window]
Mohammad Zargartalebi*
Affiliation:
Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Jalel Azaiez
Affiliation:
Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
*
†Email address for correspondence: Mohammad.zargartaleb@ucalgary.ca
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Abstract

In this study, the flow dynamics and heat transfer in partially filled pin-based microchannel heat sinks (MCHS) are examined. The lattice Boltzmann method is used to analyse the physics of these systems and examine the effects of the flow, pin configuration, size and porous medium height. The results of the study reveal that, unlike the fully filled pin-based MCHS, there is no unique behaviour for the pin configuration effects and the performance of partially filled pin-based MCHS depends on the porous medium size and structure as well as the inertial forces in the flow. In particular, it is found that there are hydrodynamic and thermal-based critical porous medium heights at which the best performance in terms of heat removal switches from the inline to the staggered configuration. The dependence of these critical heights on the Reynolds number and the porous medium properties are analysed and the effects of the flow dynamics are further unravelled through a particle tracing technique. Furthermore, a simple flow model is developed, and is shown to capture well the main trends obtained from the simulations and to bring to light more of the system physics that help explain the interplay between the different parameters.

JFM classification

Convection: Convection in porous media Mathematical Foundations: General fluid mechanics Low-Reynolds-number flows: Porous media
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 875 , 25 September 2019 , pp. 1035 - 1057
Copyright
© 2019 Cambridge University Press 

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