| Summary: | 碩士 === 大葉大學 === 機械工程研究所碩士班 === 96 === We constructed a two-dimensional valveless impedance pump consisting of a rectangular rigid tube, covered by an elastic patch at one end to form asymmetric acoustic impedance. Two acrylic reservoirs were glued to the ends of rigid tube to make an open loop and filled with water. By periodically squeezing along the elastic patch at asymmetric position using a vertical electric-mechanical compression mechanism, a pressure across the pump is generated to drive the 2D persistent flow through cumulative effects of wave propagation and reflection. This effect, called the Liebau phenomenon or valveless pumping, has been known for some time.
Along with constructing a model of circular pump with the same hydraulic diameter, we studied the flow rates for various squeezing locations, frequencies, and compression amplitudes. The results between two models were compared.
In the theoretical work, we have tried to model such a system as a flat tube with unsteady flow, Euler’s equation with appropriate boundary conditions. Analytic solutions calculated to compare with experimental flow rates.
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