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Acoustic wave induced convection and transport in gases under normal and micro-gravity conditions
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http://hdl.handle.net/1860/1795
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| Title: | Acoustic wave induced convection and transport in gases under normal and micro-gravity conditions |
| Authors: | Lin, Yiqiang |
| Keywords: | Mechanical engineering
Acoustic surface wave devices
Acoustical engineering |
| Issue Date: | 5-Sep-2007 |
| Abstract: | Acoustic wave induced convection and transport phenomena in gases by thermal and mechanical acoustic sources are numerically and experimentally studied. First, the characteristics of thermally induced acoustic waves due to rapid heating of compressible fluids are investigated. The undisturbed fluid pressure ranged from atmospheric to 8.0 MPa. The physics of the thermally induced acoustic wave and the effect of fluid properties are described and explained in detail. The flow fields generated by the thermally induced acoustic wave under microgravity and normal gravity conditions were investigated numerically. The flow field and heat transport induced by high-intensity acoustic wave fields in enclosures driven by endwall vibrations are also studied. Secondary flows (acoustic streaming) when present are found to enhance mixing and heat transfer. Secondary flow fields are also found to be significantly affected by temperature gradients in the flow field. Finally, the numerical model is applied to simulate transport in a thermoacoustic refrigerator. The temperature separation along a stack (composed of thin low-conductivity parallel plates) and the cooling effect are successfully predicted. |
| URI: | http://hdl.handle.net/1860/1795 |
| Appears in Collections: | Drexel Theses and Dissertations
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