Experimental Study of the Rectification Efficiency of Planar Microdiffusers
Autor: | Min-fang Han, 韓旻坊 |
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Rok vydání: | 2008 |
Druh dokumentu: | 學位論文 ; thesis |
Popis: | 96 The purpose of the present study is to design and fabricate the test platform used for measuring the rectification efficiency of planar micro-diffuser valves under an unsteady flow field. The fluid is pumped and filmed with a stacked-type PZT. The displacement of the actuator is measured by a CCD laser displacement sensor so that volumetric variation of the chamber can be obtained. The net volumetric flow rate of the diffuser valve is also measured and used to calculated the rectification efficiency of the diffuser valve. The diffusers are designed with a throat width of 200μm and four different diverging angle of 10°~40°. The length and the depth of the diffuser are 3000μm and 200 μm, respectively. Methanol is used as the test fluid. The actuation frequency is ranged between 2 and 100 Hz resulting in the Roshko number between 0.11~5.71. Experimental results show that all the tested diffusers have positive rectification efficiency. The maximum rectification efficiency about 23.25% occurs at 10°-diffuser operating at the Roshko number of 2.29. |
Databáze: | Networked Digital Library of Theses & Dissertations |
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