Study on the flow resistance performance of fluid cross various shapes of micro-scale pin fin

The experiments on flow resistance characteristics of various shapes of pin fins have been conducted, including the influences of different sizes, as well shapes of pin fin on pressure drop and friction coefficient. The results show that a higher density and height result in a higher pressure drop. And compared the three circular shape pin fins, the CP1 with height as 0.75 appears better pressure drop performance. When the Reynolds number is less than 600, the friction coefficient decreases quickly with the increase of the Reynolds number. While as the Re is more than around 600, the friction coefficient changes slowly. With the flow rate less than 20 ml/min, the shape of the pin fin has little effect on the resistance characteristics, and the influence increases with the increase of the flow rate, in which the friction coefficient of circular pin fin is the largest and the oval one is the smallest. Besides, the micro-scale correlation formula between the friction coefficient and the Reynolds number is fitted based on the experimental data.