碩士 / 淡江大學 / 航空太空工程學系碩士班 / 104 / This research investigated the temperature and flow fields of LED light bulbs by a CFD software (ANSYS-FLUENT). A 60W LED is used as the reference model for comparison. Some modified models with spiral fins were studied under free and forced convections. Various radiuses of curvature and numbers of fins were also studied and analyzed for heat dissipation performance.
Results demonstrated that when cooled by the spiral airflow cooling module was the heat dissipation performance of the spiral module was obviously better than the radial module. While under natural convection, the cooling performance of the spiral module was only slightly better than that of radial module. For spiral module, as the curvature of fins increased, temperature of cooling model and PCB were both increased.
The increased numbers of fins, which regulated the radius of curvature, increased the heat dissipation performance. However, when the number of fins greater than 30, the fins would be highly packed and would cause the cooling performance decreased. In addition, in both spiral and straight modules, most of the heat was accumulated in the central regions.
| Identifer | oai:union.ndltd.org:TW/104TKU05295003 |
| Date | January 2016 |
| Creators | Chih-Sheng Tsai, 蔡志聖 |
| Contributors | 湯敬民 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 112 |
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