Performance of valveless piezoelectric pump with built-in mixer
XIE Yuzhe1, SUI Rendong2, CHI Junkang1, HU Xiaoqi3, CHEN Feng1, JI Jing1, HU Caiqi1*
1. College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao, Shandong 266109, China;2. Development and Planning Office, Qingdao Agricultural University, Qingdao, Shandong 266109, China;3. College of Mechanical and Electrical Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China
Abstract：In order to achieve the sufficient mixing of different fluids in the process of conveying fluids, three built-in mixer types piezoelectric pumps were designed, including baffle built-in mixer, resistive fluid built-in mixer and winding fluid built-in mixer. The finite element analysis software COMSOL multiphysics was used to numerically simulate the mixing effect of the flow field of piezoelectric pumps, the mixing concentration of a typical cut of the flow was extracted and calculated, and the reliability of the numerical simulation of the mixing degree was verified by the experiment. At the same time, the effect of the built-in mixer on the pumping capacity of the piezoelectric pump was also studied. The results show that the built-in mixer has a significant effect on the mixing ability of the piezoelectric pump. The different structures and parameters of the built-in mixer have a large impact on the mixing degree. The mixing degree of the fluid-wound built-in mixer piezoelectric pump with six mixing units can reach 99.35% when the driving frequency is 727 Hz and the driving voltage is 150 V. Meanwhile, the pumping flow rate of the piezoelectric pump without built-in mixer is 457.3 mL/min, and the piezoelectric pumps with built-in mixer has different degrees of flow loss. The experimental results further verify the correctness of the simulation analysis, and it provides a reference for the study of the hybrid and pumping performance of piezoelectric pump.
