碩士 / 國立成功大學 / 機械工程學系碩博士班 / 95 / The present study applies the finite-difference method in conjunction with the least-squares scheme and measured temperatures to estimate the average convection heat transfer coefficient, total heat transfer rate, and fin efficiency on a vertical rectangular fin. The heat transfer coefficient on this rectangular fin is non-uniform. Thus the whole plate fin is divided into several sub-fin regions in order to predict the average heat transfer coefficient. The heat transfer coefficient on those sub-fin regions is assumed to be constant. The results show that the average heat transfer coefficient increases with increasing the fin spacing and decreases with increasing the fin height in free convection. The heat transfer coefficient on the upstream region of the fin can be markedly higher than that on the downstream region in forced convection. The average heat transfer coefficient decreases with increasing the fin spacing for a fixed air speed. However, this value approaches its corresponding asymptotical value obtained from a single fin as . In order to evidence the accuracy of the present inverse scheme and the reliability of some experimental formulas, a comparison of the average heat transfer coefficient between the present predicated results and those obtained from correlation recommended by current textbook is made.
| Identifer | oai:union.ndltd.org:TW/095NCKU5490119 |
| Date | January 2007 |
| Creators | Li-Shi Liu, 劉立熙 |
| Contributors | Han-Taw Chen, 陳寒濤 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 116 |
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