Thermal Performance of Microchannel Heat Sink with Different Shape Ribs in the Merging Chambers of the Channels

In this paper, a three-dimensional model of a microchannel (MC) heat sink with different shape ribs in merging chambers (where the MCs are interrupted) is established. The effects of different shape ribs on the heat transfer performance of MC sinks are studied. The flow characteristics and heat transfer mechanism of MCs with different shape ribs in merging chambers are explained in details. By checking the average Nusselt number, the friction coefficient and the heat transfer enhancement factor of five different shape ribs (rectangular ribs, triangular ribs, diamond ribs, double-headed cylindrical ribs, and cylindrical ribs), it is concluded that the heat transfer performance of the diamond structure ribs is the best.