Performance analysis on a novel microchannel heat sink with secondary flow channels and staggered inlet and outlet

For the sake of the decreasing temperature distribution nonuniform on the base of the microchannel heat sink, this paper proposes a novel microchannel heat sink with the secondary flow channels and staggered inlet and outlet unit to reduce the highest temperature on the base. The influences of the spacings between the inlet and outlet and between two secondary flow channels, and Reynolds number on the base temperature uniformity are studied numerically. It is found that the secondary flow can interrupt and rebuild the boundary layer of the main stream, and strengthens the mixing of the fluid to improve the local heat transfer. Therefore, setting the secondary flow channels near the highest temperature can effectively increase the base temperature uniformity. Within the scope of calculation parameter, the temperature difference ratio of the staggered inlet and outlet unit on the base between with and without the secondary flow channel is (57.2–69.8) %. However, the influence of the secondary flow channels on the pumping power is slight.