The Simulation and Optimization of a Piezoelectrically Actuated Valveless Parallel Micropump

Abstract

This study is to use the numerical simulation analysis software ANSYS to investigate the performance changes of the piezoelectric brake valveless micropump under different boundary conditions and operating conditions; its geometric and operating variables include the parallel configuration of the pump the thickness of the elastic film and the piezoelectric The configuration of the brake the geometric shape of the cavity and the change of the driving phase angle The analysis model includes the fluid domain and the solid domain Therefore the two-way fluid-solid coupling is used as the analysis method The fluid-solid interface (FSI) is used as the information exchange medium to transfer the deformation of the solid to the fluid and the pressure in the fluid domain The changes are transferred to the solid domain and used as boundary conditions for each other to perform iterative operations This research first explores the performance difference between the traditional valveless micropump model and the parallel model including the pump flow rate and the maximum tolerable back pressure; when the operating voltage is 100V AC the maximum flow rate of the parallel model is 3 18 (ml/min) which is 1 64 times the maximum flow rate of the traditional model and increases the hydraulic power of the pump by 32% In terms of back pressure the cross-sectional area of the diffuser/nozel doubles resulting in The flow rate is increased by pressure which is 25% lower than the traditional model In the study of film thickness the effect of thickness on the flow rate in the range of 0 25mm-0 6mm was discussed The results showed that the maximum flow performance was at 0 35mm; and the configuration of the dual piezoelectric brake also successfully increased the flow by 22% The performance of 112 5% and the back pressure After integrating the above optimization conditions into a parallel model the effect of different driving phase angles on flow and back pressure was studied The results showed that the best flow and back pressure performance was obtained when the phase angle was long Compared with the phase angle the flow rate is 63 56% and the back pressure is 22 5% After comparing the streamline distribution inside the cavity aiming to increase the range and density of the vortex zone in the cavity the bionic stingray cavity structure is introduced to improve the synthetic jet phenomenon and increase the flow efficiency by 30%

Date of Award	2020
Original language	English
Supervisor	Steven Hsin-Yi Lai (Supervisor)