Abstract
Microchannel heat sink (MCHS) can be done with several cross-section channel shapes. Water flow and heat transfer characteristics are affected by the geometrical parameters of the microchannel which are numerically investigated in this paper. This study covers Reynolds number values in the range of 100–1000 and heat flux is maintained at 500kW/m2. Finite volume method (FVM) is used to solve the governing equations and 3D steady state conjugate heat transfer problem. The effects of three different channel shapes (hexagonal, circular, and rhombus) on the MCHS performance are investigated in details. The assessment of MCHS performance is based on a number of exclusive attributes which are temperature profile, heat transfer coefficient, pressure drop, friction factor, and thermal resistance. The results show that the smallest hydraulic diameter of the hexagonal cross-section MCHS has the highest pressure drop and heat transfer coefficient among other shapes. The highest value of the top wall temperature, friction factor and thermal resistance are found with the use of rhombus cross-section MCHS.
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