A NUMERICAL STUDY OF FORCED CONVECTIVE FLOW IN MICROCHANNELS HEAT SINKS WITH PERIODIC EXPANSION-CONSTRICTION CROSS SECTION

Year 2018, Volume: 4 Issue: 3, 1912 - 1925, 22.03.2018

Abdelkadir Belhadj

https://doi.org/10.18186/journal-of-thermal-engineering.408709

Cited By: 6

https://izlik.org/JA47XN43YM

Abstract

This paper aims to study numerically
the laminar convective heat transfer of ionized water flow inside rectangular
heat sinks with periodic expansion-constriction cross-section; each heat sink
consists of parallel microchannels system with 4 mm wide and 0.1 mm deep in
constant cross-section segment. 
Two-dimensional laminar numerical simulations, based on Navier-Stoks
equations and energy equation, are obtained under the same boundary conditions
for different microchannels. In this study, the heat transfer and pressure drop
inside microchannels with cross-section (cylindrical grooves and triangular
cavities) are compared with that of simple smooth microchannel at Reynolds
number ranging from 150-1500; an increase in pressure drop of 44% for all
microchannels  is observed with Reynolds
number increasing.  The obtained results
indicate an enhancement in Nusselt number for all microchannels at all Reynolds
number values with a maximum enhancement of 36%, these ameliorated thermal
parameters attribute to enhance the heat transfer efficiency of proposed
microchannels. Which improve the effect of periodic expansion-constriction
cross-section on the heat transfer performance for microelectromechanical
systems (MEMS) cooling phenomena.

 

Keywords

Cooling Systems , Heat Transfer Enhancement , Heat Sink , Microchannels , MEMS , Cross Section

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