碩士 / 國立成功大學 / 機械工程學系碩博士班 / 96 / This present study applied an inverse method involving the finite difference method in conjunction with the least-squares scheme and experimental temperature measurements to estimate the unknown heat transfer coefficient and heat transfer rate on a vertical rectangular fin with various fin spacing and fin height in natural convection. To estimate a more accurate estimation, thus the whole plate fin was divided into several analysis sub-fin regions before performing the inverse calculation. The small wind tunnel of our own device would be applied to measure the temperature of the test rectangular fin at several measurement locations in natural convection. Based on these experimental temperature measurements, the unknown heat transfer rate and heat-transfer coefficient on the vertical rectangular fin could be predicted. To validate the accuracy and reliability of the present inverse method, the predicted results of this present study would compare with those obtained from the correlation recommended by current textbooks or previous results. The results showed that the average heat transfer coefficient increases with increasing the fin spacing and decreases with increasing the fin height in free convection. However, this value approached its corresponding asymptotical value obtained from a single fin as . In order to evidence the accuracy of the presented 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/096NCKU5490163 |
| Date | January 2008 |
| Creators | Kuo-zuan Hsu, 徐國軒 |
| 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 | 85 |
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