Cui Yang, Zhu Qifeng
Four groups of microchannel heat sinks with equal-volume triangular grooves were designed, and the effects of groove geometry and arrangement on the flow and heat transfer characteristics of microchannels were numerically studied. The results show that the mixing of hot and cold fluids caused by the grooves not only increases the flow resistance of the microchannel, but also enhances the heat transfer. When the channel volume is the same, the flow resistance and heat transfer of the microchannel increase with the increase of grooves depth and the decrease of grooves width. For the same grooves, the flow resistance and Nusselt number of the microchannels with aligned grooves are larger than those of the microchannels with offset ones. The overall performance, the heat transfer entropy production and the entropy production of the microchannels increase with the increase of the groove width, and the maximum of the enhanced heat transfer factor can be achieved up to 1.42.
Microchannel heat sink; Triangular groove; Heat transfer enhancement; Entropy; Arrangement