Manufacturing and Investigation of the Polymer Wick Structure Applied to Loop Heat Pipe
| Autor: | Perng-Kae Wang, 王鵬凱 |
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| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 Polymer wick structure has the advantages that include high porosity, low thermal conductivity coefficient and lower manufacturing cost etc. However the relative researches on applying the polymer wick structure to LHP is still not familiar to date. Hence, the present effort seeks to set up the design, fabrication and test capacity of the polymer wick which is applicable to LHP. Based on the operating limitation and characteristics of LHP, polystyrene is chosen as the material and the polymer wick structure is fabricated by salt leaching method. Here, obstacles arising in the clustering of sodium chloride powder and the geometry effect of the filling material used during hot pressing process are solved. Besides, after the polymer wick structure is made, the wick parameters that include pore size, pore radius and permeability are measured. The wick is then installed into a LHP, and the heat transfer performance of LHP system is tested. The testing results show that, the pore radius lies in between 12~13, and the porosity can be controlled within the range of 65~78%. Summarizing the permeability of the polymer wicks with different porosity, a formula between permeability and porosity expressed as is established. The formula would help the prediction of the heat transfer capacity of LHP. Finally, a polymer wick with the porosity of 65%, pore size 12.5 and the permeability of is installed into a LHP system, and the performance test is conducted under the operating temperature of 50℃ and the heat sink temperature of 10℃. The results show that, the maximum heat transfer capacity of present LHP system approaches 200W, and the thermal resistant is 0.177℃/W. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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