Numerical simulation of flow and heat transfer characteristics of microchannels with ribbed structures of bionic fish fins.

In order to improve the heat dissipation performance and comprehensive performance, a new type of bionic fish fin-rib microchannel heat sink is designed. The microchannel heat sink adopts symmetrical fish fin sidewalls and contains rectangular ribs in the channel. In this paper, the flow and heat transfer characteristics of smooth linear microchannels (MC), rectangular-rib smooth linear microchannels (MC-RP), fish fin microchannels (FN) and fish fin-rib microchannels (FN-RP) are studied by numerical methods, and the influence mechanism of the composite structure of micro-ribs and fish fin channels on the flow and heat transfer performance enhancement of microchannel heat exchangers is explored. The results show that the comprehensive evaluation coefficient of the fish fin-rib microchannel is the best among the four channels, reaching 1.82 at Re = 800. The effects of rectangular, diamond, teardrop- shaped and fish fin-shaped ribs on the microchannel are further studied, and the fish fin ribs are the best.