碩士 / 國立成功大學 / 機械工程學系碩博士班 / 98 / The present study applies an inverse method involving the finite difference method in conjunction with the least-squares scheme and experimental temperature measurements to estimate the unknown natural-convection heat transfer coefficient, heat transfer coefficient under the isothermal condition, heat transfer rate and fin efficiency on a rectangular fin mounted on vertical or horizontal plate in closed or open rectangular enclosures. To obtain the present estimates, the whole plate fin is divided into several analytic sub-fin regions before performing the inverse calculation. The heat transfer coefficient on each analytical sub-fin region is assumed as a constant. Later, the present estimates can be obtained using the present inverse scheme. The results show that the average heat transfer coefficient increases with increasing the fin spacing and decreases with increasing the fin height. The fin efficiency decreases with increasing the fin spacing. In the open rectangular enclosure, the chimney effect enhance the natural convection. Thus, the heat transfer coefficient and heat transfer rate are higher than those obtained from the closed rectangular enclosure. In order to evidence the accuracy of the present inverse scheme, the present estimates of the average heat transfer coefficient under the isothermal condition compared with those obtained from the correlation recommended by current textbook and other previous results.
| Identifer | oai:union.ndltd.org:TW/098NCKU5490064 |
| Date | January 2010 |
| Creators | Ge-JhangHe, 何格彰 |
| 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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