碩士 / 國立成功大學 / 機械工程學系碩博士班 / 100 / The present study applies the numerical inverse method and experimental method to predict the average heat transfer coefficient and heat transfer coefficient under the isothermal situation on two kinds of elliptic tubes and plate-finned heat exchangers for two-row staggered arrangements in different fin spacings and air velocities. Due to the non-uniform distribution of the heat transfer coefficient, it must divide the plate fin into several sub-fin regions before performing the inverse scheme, and the unknown average heat transfer coefficient on each sub-fin region is required. Next step, the inverse scheme of the finite difference method in conjunction with the Least squares scheme and experimental measured temperatures is applied to determine the present results. Another important result of the study is that and in nature convection increase with increasing the fin spacing S but it tends asymptotically towards a certain limiting or final value. However, and in force convection increase with increasing the fin spacing S and air velocity. The lower average heat transfer coefficients concerned with the upstream and wake fin regions of the 2nd row, The concentrated elliptic tube of staggered plate-finned may increase the pressure drop. A computational fluid dynamics ( CFD ) program called Fluent for verifying the Reliability is used in the analysis.
| Identifer | oai:union.ndltd.org:TW/100NCKU5490136 |
| Date | January 2012 |
| Creators | Shi-WeiZhan, 詹士緯 |
| Contributors | Han-Tao 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 | 92 |
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