Abstract：A piezoelectric valve-less micro-mixer was designed.Structure and working principle of the micro-mixer were illustrated and analyzed.Transient dynamic analysis was done on the round composite piezoelectric vibrator using ANSYS software.Displacement changing laws of the points on the center plane of the vibrator with radius and driving voltage under condition of the piezoelectric vibrator driven by sinusoidal alternating voltage were studied.It is found that displacements of the points behave sinusoidal changing laws.Amplitudes of the points decrease with radius but increase with driving voltage.Motion displacement equation of the piezoelectric vibrator was fitted according to displacement of each point on piezoelectric vibrator.A UDF program was edited and complied according to the motion displacement equation,and then the program was transferred to the Fluent software used as the moving boundary of the piezoelectric vibrator.Dynamic numerical simulation was carried out on the piezoelectric valve-less micro-mixer,as well as the flowrate of the micro-mixer and mixing conditions in the micro-mixer at different time were obtained.The results show that the piezoelectric valve-less micro-mixer designed is not only able to pump fluids but also to get fluids mixed well in a short time.
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