碩士 / 國立海洋大學 / 機械與輪機工程學系 / 91 / The feasibility and effectiveness of air jet impingement cooling on pin fin heat sinks applied in personal computers (PC) were investigated numerically in this study. The effects of fin height, fin width, base plate thickness of the heat sink and the vertical spacing between the nozzle and the heat sink were discussed. Two heat sinks (each of base plate thickness 7 mm, fin height 32.75mm, and fin widths 4.13mm and 5.3mm, respectively) were cast in a desktop PC, and numerical simulation was performed for each configuration. The results obtained were compared with that based on traditional cooler, which consists of fan and heat sink. Due to limited chassis spacing, the spacing between the nozzle and the heat sink as well as the fin height is insufficient. Therefore, the chassis dimensions were enlarged so that the fin height and the distance between the nozzle and the heat sink could be increased.
It was found that for a PC with a Pentium 4 2.8GHz CPU (68.4W), the performance by the jet impingement cooling based on fin width Df = 5.3mm, nozzle-to-heat sink spacing z/D = 4, Reynolds number Re = 15000 is better than that base on the traditional cooler. When the Reynolds number increases to 20000, the overall thermal resistance for the heat sink qja can reach the criteria suggested by Intel. Finally when Re increase to 30000, qja was found to be very close to the suggested value.
| Identifer | oai:union.ndltd.org:TW/091NTOU0491017 |
| Date | January 2003 |
| Creators | 黃為棟 |
| Contributors | 田華忠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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