| Author: | Yang, Xinqi |
| Title: | Modelling valveless impedance pump with solid fluid interaction |
| Advisors: | Choy, Y. S. (ME) |
| Degree: | M.Sc. |
| Year: | 2023 |
| Subject: | Pumping machinery Fluid mechanics Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Mechanical Engineering |
| Pages: | vii, 92 pages : color illustrations |
| Language: | English |
| Abstract: | The mechanism behind the Liebau pump has been studied for over 70 years. Acoustic impedance mismatch theory and volume change theory are flawed. This dissertation proposed a new model to explain the physicism behind the Liebau pump by examining how the fluid domain will respond if solid boundaries move in certain wave patterns. The analytical solution is derived from lubrication analysis, with numerical validation. Three solid wave patterns were investigated. First, when the solid boundary is under the single resonant mode, no accumulative flow can achieve. And the knot in the fluid domain is corresponding to anti-knots in the solid boundary. Second, when an elastic wave travels through the interface, instead of a suction side, a recirculation loop forms in the fluid domain and travels with the deforming area. Third, the position of the squeeze motion will affect the ratio of the volumetric flow rate at the inlet and outlet. That is why the excitation position will affect the pumping performance. The Fourier Series can be used in the fluid domain. The fluid pattern generated by the elastic solid wave is not the same concept as the acoustic pressure wave in the high-speed fluid. Finally, a novel impedance pump has been proposed to enhance the pumping efficiency. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 7484.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 16.05 MB | Adobe PDF | View/Open |
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