Simulation and Experiment of Piezoelectric Pump with Coanda Effect Guiding Path Flow
The disturbance of eddy current resistance to the difference between positive and negative flow resis-tance causes the output flow of the valveless piezoelectric pump to be unstable.Currently,research on valveless piezoelectric pumps mainly focuses on the design of resistance parts or flow resistance pipes to inhibit backflow generation.However,the difference between positive and reverse flow resistances,generated solely by the flow pipe structure,has a limited inhibitory effect on backflow.Therefore,a valveless piezoelectric pump is proposed based on the principle of the Coanda effect.The pump employs locally generated vortex to clear the return liq-uid,ensuring that the flow paths of the liquid in the forward and reverse flow are different,thereby achieving liq-uid pumping.Using the ideal flow resistance model of the"water gun"flow tube,the feasibility of clearing the idea of back-flow liquid is discussed.Subsequently,ANSYS software is used to determine the flow paths in both positive and negative directions to obtain the output net flow.After processing the experimental prototype and testing the pumping flow,it is observed that the pumping flow initially increases and then decreases with the increase in frequency.When the peak-to-peak value of voltage is 115 V and the frequency is 19 Hz,the maxi-mum flow is 12.69 mL/min;when the constant frequency is 19 Hz,increasing the peak-to-peak voltage value increases the pumping flow.This verifies the working effectiveness of the valveless piezoelectric pump.
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