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 wet fin for various air speeds. The heat transfer coefficient on this rectangular fin is non-uniform. Thus the whole plate fin is divided into sub-fin regions in order to predict the average heat transfer coefficient on a wet fin. The average convection heat transfer coefficient on those sub-fin regions is assumed to be constant.
The average heat transfer coefficient increases with increasing the air speed and the fin height, and the fin efficiency decreases with increasing the air speed for various fin spacing in forced convection. The average heat transfer coefficient decreases with increasing the fin spacing for a fixed air speed. It can also approach its corresponding asymptotical value obtained from a single fin for the fin spacing above a certain value. The effects of the fin spacing and fin height on the present estimates can not be negligible in forced convection. A comparison of the forced convection heat transfer coefficient between the present estimates and previous results is made in order to evidence the accuracy and reliability of the present inverse scheme.
| Identifer | oai:union.ndltd.org:TW/095NCKU5490122 |
| Date | January 2007 |
| Creators | Jun-hao Chen, 陳軍豪 |
| 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 | 100 |
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