| Summary: | 碩士 === 國立中正大學 === 機械工程所 === 96 === This thesis aimed at designing a valve-less pump and finding out affiliated dimensions for the best pump performance through the analysis of the internal micropump performance by CFD ( computational fluid dynamics). The coordination between the micro-channel system and the diaphragm allows the micropump to alter the amount of fluid within the channel and hence control the flow of the fluid, The pump diaphragms are excited using piezoelectric discs. At the inlet / outlet of the pump chamber, an aerofoil barrier is inserted to be the geometry structure. In this study, the length of the diffuser was 1800 ~ 3000μm and the diffuse angle was 6 °~ 15°. Operating frequency was set to be 1000Hz~6000Hz and two types of pump liquids, namely water and ethanol, with different viscousness were used.
We simulated the use of diffuser/nozzle in the literature to test and verify the reliability of our computation. FLUENT was used to simulate the result, allowing us to understand the structure and nature of the diffuser/nozzle. Several simulations were performed using different neck width (W), channel length (L) and opening angle (
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