Effects of Distinct Elastic Moduli and Supports of Vibration Chamber on the performance of PMMA Piezoelectric Valveless Micropumps
Date Issued
2016
Date
2016
Author(s)
Chiang, Chih-Wen
Abstract
This paper used the ANSYS software to perform numerical analysis on the efficiency for the valveless nozzle/diffuser-based micropump. By designing the elastic chamber, and changing the elastic constants of chamber to the micropump in order to discuss its influence on the pumping efficiency. This paper not only compared the flow rate between simulations and experiments, but also discussed and analyzed the simulation fluid field with experimental results, in order to know more details of the fluid mechanism. Unlike the common method in the simulation of micropump, the simulating model in this paper is established to be more complete by considering piezoelectric materials, the structure of micropump, and the flow field in all. Conventionally, CFD software processes fluid-structure interaction using moving boundary method. Instead, this paper used ANSYS and ANSYS CFX for the structural and fluid domains, respectively. Both the structural and fluid domains are coupled in the three-dimensional simulation. The simulation results are closer to reality than the moving boundary. From the numerical results under changing the boundary conditions, the moreconstraints the chamber is imposed, the higher resonant frequency it is. The flow rate would be much more smaller when the base is elastic. When changing the elastic constant of bottom cover of the chamber, the lower elastic constants are, the smaller flow rate would be, and the resonant frequency shifts to the left. We get the numerical results which agree well with the experimental data by taking an appropriate boundary conditions and elastic constants. In addition, we also discuss the motion of chamber in one period through the pressure and velocity change inside the chamber.
Subjects
PZT valveless micropump
fluid-structure
boundary condition
velocity and pressure distribution
Type
thesis
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