Abstract
A new valve-less micro-pump was developed in this study. The pump is composed of a variable volume pump chamber with a piezoelectric actuator and a fluid conveying pipe connected to the pump chamber with an angle through the pipe. A net pumping was realized in the asymmetric flow profiles in the asymmetric configurations of the pump chamber and fluid conveying pipe. The actuator was driven by using a sinusoidal 250V AC signal at frequencies from 8 to 25Hz. The frequency response of the pump to the driving frequency showed that there exists an optimal driving frequency for the pump geometry. The maximum flow rate was 1.3ml/min at 0Pa under the optimum frequency, whereas the total head rise through pump was 600Pa at zero flow rate for water. The net pumping of fluid in valve-less micro-pump was confirmed by numerical calculation using commercial CFD software CFX-TASCflow.
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