碩士 / 建國科技大學 / 機械工程系暨製造科技研究所 / 105 / This work experimentally investigated the effects of wind duct and extended nozzle on the heat transfer characteristics of the fins/porous-media heat sinks normally under the impinging air flow driven by air compressor or motor fan. Total eight heat sinks made of various fin array and porous media and nine wind ducts combined with different duct length and extended-nozzle length were employed herein. The experimental results indicated that the effects of the wind duct and extended nozzle on the overall heat transfer were various. When the impinging air flow was driven by the air compressor, the overall heat transfer capacities of the heat sinks combining the fins and porous media were generally higher than those of pure finned heat sinks or pure porous-media heat sinks by around 56%. The total Nusselt numbers of the heat sink with five plate fins and al-foam blocks and the heat sink with 5×5 square pin fins and packed brass beads were even higher than those of the pure finned heat sinks by about 70%. When the impinging air flow was produced by the motor fan, the heat sinks combining fins with aluminum foams had the best heat transfer. The total Nusselt number of the heat sink with five plate fins, 5×5 square pin fins or pure aluminum foams was about 8.6% lower than that of the heat sink combining fins with aluminum foams. Compared with the heat sinks combining fins with aluminum foams, the heat transfer performance of heat sinks combining fins with packed brass beads were reduced by 30%. The heat transfer capacity of pure packed-brass-beads heat sink was even reduced by 70%.
| Identifer | oai:union.ndltd.org:TW/105CTU00490001 |
| Date | January 2017 |
| Creators | Wei-Kai Huang, 黃偉凱 |
| Contributors | Tzer-Ming Jeng, Sheng-Chung Tzeng, 鄭澤明, 曾憲中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 95 |
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