Effects of geometric parameters on fluid-flow and heat transfer in micro-channel heat sink with trapezoidal grooves in sidewalls

Abstract

Trapezoidal grooves were arranged in channel sidewalls of the proposed microchannel heat sinks to enhance heat transfer for cooling microelectronic systems. Three-dimensional numerical simulations were carried out to investigate the characteristics of fluid flow and heat transfer in the proposed microchannels. Field structures of thermal fluid flow, Nusselt number (Nu) and friction factor (f) were employed to study the effects of the relative groove depth (?) and relative grooves spacing length (?) of trapezoidal grooves on the thermal and hydraulic performance of the proposed microchannels. The results showed that the proposed microchannel presented better flow and thermal performance than the smooth straight one for Re <597.74 with f/f0<1 and for Re >149.44 with Nu/Nu0>1, respectively. The thermal enhancement factor (?) was achieved up to 1.197 with ?=0.4 and ?=1 for Re=714.18. Furthermore, the relative groove depth had much more significant influence on the overall performance than the relative groove spacing length.