Flow and heat transfer characteristics for long-diamond shaped micro pin fin

Key words:  micro pin fin  flow  enhanced heat transfer  heat flux

Abstract:

The silicon long-diamond shaped micro pin fin was manufactured, and the flow and heat transfer characteristics of long-diamond shaped micro pin fin were experimentally researched and numerically simulated. The results show that within the range of Re used in experiments, the heat transfer coefficient of the long-diamond shaped micro pin fin increases with the increase of Re. For the same Reynolds number, the heat flux has no effect on heat transfer coefficient. The thermal resistance will decrease with the pump power increasing, and decrease faster when pump power is small. When the pump power increases to a certain value, the thermal resistance will remain unchanged. There is no difference in total thermal resistance for different heat fluxes. Nu increases with the increase of Re. For the diamond shaped circular micro pin fin with the same size, 45° long-diamond micro pin fin has the best heat transfer performance. The long-diamond design can avoid the vortex shedding which causes the pressure loss. Also, the long-diamond design can extend the heat transfer area and improve the conductivity of solid. Therefore it can enhance the heat transfer effect.