碩士 / 逢甲大學 / 機械工程學所 / 90 / Fluid flow and heat transfer in a plate-fin-and-tube heat exchanger were studied numerically. Flow is incompressible, three-dimensional and laminar. A commercial PHOENICS code which is based on the SIMPLE algorithm are used to solve a set of nonlinear partial differential equations. The effects of different geometrical parameters such as the shape, the angle of attack, the number, the position of vortex generators and the velocity of the main flow are investigated. The local information of pressure and heat transfer coefficient can offer important message for the design’s of heat exchanger.
From the numerical results, it is shown that the heat transfer gets better while the angle of attack of vortex generators, the velocity of main flow are larger, the number of vortex generators increases and the position of vortex generators is near the back of the circular tube ; and the pressure drop increases with any of the following : the angle of attack of vortex generators, the velocity of main flow are larger, the number of vortex generators increases and the position of vortex generators is near the center of the circular tube. When the plate-fin-and-tube heat exchanger is punched different type of vortex generators on the fin, the heat transfer of the fin with delta wing is the best, the second one is delta winglet pair, the third one is rectangular wing, and the worst one is rectangular winglet pair.
| Identifer | oai:union.ndltd.org:TW/090FCU05489030 |
| Date | January 2002 |
| Creators | Chin-Tang Tseng, 曾敬棠 |
| Contributors | Wen-Jeng Chang, 張文政 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 137 |
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