碩士 / 華梵大學 / 機電工程研究所 / 91 / Because of the characteristic of high heat transfer rate and mass transfer rate, the impinging air cooling is widely utilized on industrial applications including, among others, the cooling of steel plates, the drying of paper, the cooling of turbines. The impinging jet is combined with the appropriate geometrical shape of heat sink for the highest heat transfer rate.
In this thesis, experimental and simulated methods are used to analyze the optimal shape of the plate heat sinks. By changing the height and the width of the fin and the Reynolds number, the effects of the parameters on the heat transfer are investigated for a constant heating rate. The research reveals that the Reynolds number influences the heat transfer and the enhancement decreases gradually as the Reynolds number increases. The width of the fin will influence the size of the flow channel for a constant substrate area. When the width of the fin is bigger, the lower velocity impinging jet is difficult to flow into the heat sink and the heat transfer will decrease. Therefore higher velocity impinging jets are needed to reduce the temperature effectively. The height of the fin is a factor to change the heat transfer area for a constant fin width. The heat transfer can be increased effectively by increasing the fin height.
In the study, it is found that the simulated and the experimental results have the same trend. The thermal resistance decreases as the Reynolds number increases. At high Reynolds numbers, heat sinks with wider and higher fins can increase the heat transfer effectively.
| Identifer | oai:union.ndltd.org:TW/091HCHT0657018 |
| Date | January 2003 |
| Creators | Chia-Lin Chung, 鍾佳玲 |
| Contributors | Hung-Yi Li, 李弘毅 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 82 |
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