The effectiveness of secondary channel on the performance of hybrid microchannel heat sink at low pumping power

Abstract

High heat flux generated by advance miniature electronic devices with high power density is one of the factor that often adversely affects the device performance. Microchannels heat sink appears as a promising method which can removes the such heat flux. However, pressure drop generated by geometry in innovated MCHS consumes high pumping power in order to obtain the optimum overall performance of the MCHS. In this study, the combined effect of secondary channel with hybrid design (SD-RR-SC MCHS) has been analysed numerically. The result shows SD-RR-SC MCHS obtained highest overall performance over other designs for the low Re number (100≤ Re ≤450) and achieved PF of 1.65 at Re = 450. Besides that, the increases of pumping power consumption corresponding to CR MCHS for SD-RR-SC MCHS, SD-RR MCHS and RR MCHS at Re number of 450 are 71.2%, 101.7% and 351.4%, respectively. Means that, SD-RR-SC MCHS is suitable for an application which requires lower pumping power consumption. The existence of secondary channel geometry in SD-RR-SC MCHS has reduced the static pressure in its channel that contributes to the reduction of pumping power consumption. Furthermore, the design shows the most uniform velocity distribution which has contributed to the thermal performance enhancement.