Abstract：Flow loss in V-shape tube was analyzed,and the structure of the valve-less piezoelectric pump with V-shape tube was optimized.CFD software was used to simulate the flows in the original and improved V-shape tubes respectively.The results indicate that the flow resistance coefficient of the improved V-shape tube at bus tube opening with round corner is greater than that with right angle.By comparing the velocity vector distributions in the two tubes,it can be concluded that the bus tube with round corner can restrain the back flow and eddy,thus reduce the flow losses increase.By simulating numerically five V-shape tubes with different radius of corners,it is shown that greater radius of corners can increase flow resistance coefficient of V-shape tube and the efficiency of the valve-less piezoelectric pump.The optimization design of the kind provides a way to further improve the valve-less piezoelectric pump with V-shape tube.
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