A vortex-valve piezoelectric pump was proposed,and numerical analysis was done to simulate it by using dynamic mesh model.Dynamic simulation was carried on the piezoelectric pump to get the inner flow fields,thus the velocity profiles and pressure distributions in the pump at different processes were obtained.The dynamic mesh model effectively simulates the fluid-solid coupling dynamic characteristic between the piezoelectric vibrator and fluids,which demonstrates its feasibility in simulating moving boundary of piezoelectric pump.Dynamic mesh model was also applied to study the effect of driving frequency,amplitude of piezoelectric vibrator and height of pump chamber to pump output performance.It is found that when driving frequency decreases,the vibrator amplitude and the pump volume flow rate increases,while the flow rate reaches maximum as pump chamber is about 250 μm high.Cavitation simulation was also carried on the vortex-valve and the whole pump,and vapor-liquid distributions at different moments were obtained,providing some basis for prediction for cavitation phenomenon in piezoelectric pump and looking for cavitation prevention methods.
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