碩士 / 雲林科技大學 / 機械工程系碩士班 / 96 / The heat transfer coefficient and pressure drop by different air flow rates of in compact fin heat exchangers were empirically studied and the flow visualizations were taken to see the flow phenomenon in the flow channels. The test heat sink has a rectangular size of , the fin pitch is . The test samples included the plate fin, small triangular fin, middle triangular fin, big triangular fin and triangular different angle of attack fin for generating vortex. Also, the combined dimple and plate fin, dimple fin, one groups dimple fin and two groups dimple fin were tested.
The results indicated that the triangular different angle of attack fin not only effectively increases heat transfer, but also reduce approximately pressure drops as compared to the big triangular fin with relative same size. In addition, it induces the lowest thermal resistance as compared to the other fins for the same pumping power. Using the principle for evaluation, tit needs the smallest heat transfer area and can reduce area as compared to the plate fin at wind speed about . While using the principle for evaluation, it needs the lowest operation power. As speed about , it reduces of power as compared to the plate fin. From the above discussion, the triangular different angle of attack fin can reduce the most pumping power and heat transfer, thus, it is the best choice for design.
| Identifer | oai:union.ndltd.org:TW/096YUNT5489029 |
| Date | January 2008 |
| Creators | Shu-Lin Li, 李書琳 |
| Contributors | In-Youn Chen, 陳英洋 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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