碩士 / 國立中央大學 / 機械工程研究所 / 96 / This study is trying to develop a new kind fin, which were used the theory of vortex generators. Because the longitudinal vortices can destroy boundary layer and increase heat transfer by vortex. Experiment use with triangular winglet to for the design basis, design different ways of arranging. In order to understand the influence by the fin pitch, there are two kinds of fin pitch, which wide were 1.38 mm and 1.85 mm. The heat transfer characteristics of vortex generators were investigated experimentally.
In the same flow rate, the number of vortex generators is more, the more obstruction is, and pressure drop is the greater. For fin pitch 1.85mm and high velocity of flow and high situation of heating, two row vortex generators is
better heat performance. Because the air above drives the middle fluid to flow, it can produce stronger vortex. When the velocity of flow of air is 5m/s, vortex generators can produce vortex effectively, and increase heat transfer coefficient. Fin pitch 1.85mm, three line vortex generators is lower thermal resistance than three row vortex generators in low velocity of flow. But in the high velocity of flow, three row vortex generators have lower thermal resistance value. In this article, some parameters which will influence the vortex generators were understood by experiment, we can choose the different types of vortex
generators by judging the way of application.
| Identifer | oai:union.ndltd.org:TW/096NCU05489129 |
| Date | January 2008 |
| Creators | Hsin-Chang Wu, 吳信昌 |
| Contributors | Chien-Yuh Yang, 楊建裕 |
| 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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