碩士 / 國立成功大學 / 機械工程學系 / 103 / This study applies inverse method and FLUENT to determine the heat transfer and fluid flow characteristics of plate-fin heat sinks with various enclosures and whether to install the axial-flow fan inside. Using measured data to forecast and analyze the average heat transfer coefficient on the fin in limited space. The inverse method along with the finite difference method and experimental temperature data is applied to determine the heat transfer coefficient. Since the distribution of the heat transfer coefficient on the fin is not uniform, the plate-fin is divided into several sub-fin regions and the heat transfer coefficient in each sub-fin region is assumed to be unknown constant. The results indicate that the heat transfer coefficient increase with increasing fin spacings and lengths of the enclosure in natural convection. Increasing the heights of enclosure can effectively enhance the stack effect after using some openings. But the average heat transfer coefficient decreases with decreasing length of the enclosure in mixed convection. If the length of the enclosure less than a given value, the heat dissipation of fins with axial-flow fan in mixed convection is worse than which inside of the enclosure with openings in natural convection. At the same time, the effect of the height of the enclosure decreases when using axial-flow fan. In order to verify the reliability of the inverse method with predicted results of this paper, the present study also in comparison with the empirical corelations of other relevant literature and CFD simulation packages.
| Identifer | oai:union.ndltd.org:TW/103NCKU5489052 |
| Date | January 2015 |
| Creators | Tzu-HsiangLin, 林子祥 |
| Contributors | Han-Taw Chen, 陳寒濤 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 97 |
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