Asymmetrical flow effect applied to pumping performance of simple duct channel

In this study, a simple pumping system, composed of a piezoelectric buzzer imbedded in a duct channel, was used to study the effect of longitudinal flow asymmetry on pumping performance in view of its importance in the design of valveless pumping systems, in spite of the fact that this has rarely been addressed before. The physical features of flow asymmetry caused by the Liebau effect, during the asymmetrical or asynchronous vibration of a buzzer in the course of space and time, can generate net mass flow and result in a pumping performance that has been confirmed experimentally. The degree of transversal asymmetry of a buzzer in space and time positively correlates with longitudinal asymmetry for pumping performance. This principle should be useful when designing valveless pumping systems, especially for applications for fields like bio-medicine, bio-chemistry, and environmental testing. Since this pumping system uses simple components, no moving valve structure will not damage any biological particles in a transmission process.