碩士 / 元智大學 / 機械工程學系 / 94 / This study presents the thermal-hydraulic performance of heat sinks having complex, delta wing, louver, plain, and slit fin patterns. Comparison of the associated heat transfer performance and the effect of fin pitch are made. Test results indicate that the enhanced fin pattern, like louver fin, is preferable to the plain fin geometry when operating at a higher frontal velocity or at a larger fin pitch. It is also found that the heat transfer performance of louver fins is better than that of other fins at the expense of higher pressure drops. Test results also reveal a significant drop of heat transfer performance at a lower Reynolds number, or at a smaller fin pitch, or the so-called “maximum” phenomenon of Colburn factor. This is applicable to all the tested geometries. By carefully examining the test results, we conclude that this phenomenon is related to the developing/fully developed flow characteristics. In fact, the maximum point occurs roughly at Gz=10 where fully developed and developing flows are separated. For performance evaluation of the tested heat sinks, comparisons are made subject to the VG-1 and FG-3 criteria.
| Identifer | oai:union.ndltd.org:TW/094YZU05489031 |
| Date | January 2006 |
| Creators | Ching-Ming Chiang, 江慶銘 |
| Contributors | 林育才 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 68 |
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