碩士 / 國立成功大學 / 機械工程學系 / 104 / The present study applies the inverse method and CFD software in conjunction with the experimental method to predict the heat characteristics of plate-fin and tube heat exchangers. The effects of parameters such as fin pitch, air velocity and tube diameter are examined. Since the heat transfer coefficient on the fin is not uniform, the fin is divided into several sub-regions and the heat transfer coefficient in each sub-regions is assumed to be a constant. Later, the inverse method applies finite difference method in conjunction with the least-squares scheme and the experimental data to estimate the heat transfer coefficient on the fins. Furthermore, how to choose the appropriate flow model and the effect of grid points are also investigated. Velocity, temperature and heat transfer coefficient distributions of the fin are determined using the CFD software. More accurate results can be obtained if the heat transfer coefficient is closed to the inverse results and matches the existing correlations. The results obtained using the RNG-k-ε turbulence flow model are more accurate for natural convection and mixed convection.
| Identifer | oai:union.ndltd.org:TW/104NCKU5489072 |
| Date | January 2016 |
| Creators | Yung-ShiangLin, 林詠翔 |
| 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 | 99 |
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