Theory and experiment of the valveless piezoelectric pump using tubes with combinated shape of ‘Y’ and cone

Considering the advantages and disadvantages of several typical no-moving-part valves which are applied in the areas of biology, medical treatment and sanitation, a new type of valveless piezoelectric pump, using tubes with combinated shape of `Y´ and cone, is developed based on the novel type of tube, which aims to stress the overall advantages and overcomes other drawbacks. Theoretical analysis is applied to local resistance coefficient of the Y-shape tubes. According to the local resistance coefficient of the diffuser tubes, the local resistance coefficient of the combinated y-cone shape tubes is deduced. The commercial finite element software CFX is employed to simulate the fluid flowing state in the valveless piezoelectric pump using tubes with combinated shape of `Y´ and cone. A valveless piezoelectric pump using tubes with combinated shape of `Y´ and cone was fabricated, and the flow test of the device which serves to verify the essential characteristics being a pump was carried out. The experimental results show that the maximum flow rate of the valveless pump using tubes with combinated shape of `Y´ and cone is 43.9 ml/min under 100V, 15Hz power supply.