Numerical Analysis of a Valveless One-side Actuating Piezoelectric Micropump
Date Issued
2009
Date
2009
Author(s)
Hsiao, Yu-Cheng
Abstract
In this study, a novel valveless diaphragm micropump based on one-side actuation has been successfully developed. A three-dimension, transition numerical model of the micropump established by commercial CFD software was employed to analyze the performance. A primary chamber with the dimensions of 45 mm?28mm?4mm is designed in the micropump. A 37.5 mm?20 mm piezoelectric device fixed on the one side of the primary chamber was seen as a driving device and drains liquid in one-direction. The moving boundary was studied with two methods to simulate the flow field of the primary chamber in the micropump. In addition, the several components, including secondary chamber, nozzle/diffuser and U-channel, were individually designed to connect the primary chamber as the flow-direction devices. The simulation results show that the micropumps were strongly affected by the frequencies, flow-direction devices, and applied force. Finally, the performance of the valveless micropump with secondary chamber numerical model was selected to compare with the experimental results. The maximum flow rate and pump head of numerical results were 1.25ml/s and 1318Pa under the force of 0.28 N at the frequency of 150Hz, which were also close to the results of experimental work.
Subjects
Micropump
One-side actuating
Piezoelectric
Flow-direction device
Type
thesis
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