碩士 / 國立成功大學 / 機械工程學系碩博士班 / 91 / Experimental and numerical analyses were carried out to study the heat transfer and flow in the plate finned-tube heat exchangers with inclined block shape vortex generators mounted behind the tubes. The study was performed for a variety of span angle over a range of flow conditions. Experiments were examined by a water tunnel system to visualize local flow structure. In addition, numerical simulation was performed by a 3-D turbulence analysis of the heat transfer and fluid flow. The results indicated that the proposed heat transfer enhancement technique enable to generate longitudinal vortices and to improve the heat transfer performance in the wake regions. These effects were intensified as the span angle is increased. Furthermore, the case of 45°span angle provides the best heat transfer augmentation. A reduction in fin area of 24% may be obtained if vortex generators embedded fins are used in place of plain fins.
| Identifer | oai:union.ndltd.org:TW/091NCKU5490091 |
| Date | January 2003 |
| Creators | Ying-Hao Wu, 吳英豪 |
| Contributors | Jiin-Yuh Jang, 張錦裕 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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