碩士 / 大同大學 / 機械工程學系(所) / 99 / In this thesis, we investigate heat transfer performance of zeroth-level-bifurcation tree-shaped fins under the constraint of a fixed heat flux and the total volume of fins. We studied the effects of the number of fins (N), the orientation of fins, the width ratio between thin fins and the thick fin (D2/D1), the height of the thick fin (h/H), and Reynolds number (Re) on the thermal performance of tree fins. We find that increasing Reynolds number can enhance the heat transfer performance, but the improvement slows down as Reynolds number increases. Increasing the fin-width ratio can increase the heat transfer area, but an improved heat removal rate does not observed as undersigned architecture will weaken the flow efficiency. It is shown that the best performance is discovered when the fin-width ratio is between 0.4 and 0.8. An optimized thick fin height varies case by case, and it ranges from 0.2 to 0.6. The optimized orientation of the tree fins is greatly influenced by the number of fins. Among all types discussed in this thesis, the best design is Type_h, which includes eight fins and its orientation is to face the flow directly.
| Identifer | oai:union.ndltd.org:TW/099TTU05311010 |
| Date | January 2011 |
| Creators | Chun-Lin Fu, 傅俊霖 |
| Contributors | Kuan-Min Wang, 王冠閔 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 121 |
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