碩士 / 國立交通大學 / 機械工程系所 / 105 / The study investigates the heat transfer of a rectangle cooling channel with pin-fin array at high rotation numbers using thermochromic liquid crystal. The channel aspect ratio is 4 and angle of channel orientation is 150°. Eight rows of staggered circular pin-fins are used with the spanwise and streamwise spacing of 2. Various fin array configurations (full fin, partial fin, and missing fin) is studied by changing the fin geometry at the fourth row of the fin array. The Reynolds numbers in the current study are 5000, 10000, and 20000. The rotation number ranges from 0 to 0.65, and the density ratio is maintained at 0.1. At high rotation number, the rotation effect influences fluid flow in the channel, which causes different heat transfer near the top and bottom side of the channel. The wake flow behind the pin fin moves towards the bottom side. For the trailing surface, the heat transfer difference of the full fin and missing fin is 10% and 40%, respectively. For the leading surface, the heat transfer difference of the full fin and missing fin is 15% and 42%, respectively. The heat transfer on the trailing surface from the three fin configurations significantly enhances with an increase of rotation number. Comparing to the stationary state, increases of heat transfer from the partial fin and missing fin are 61% and 57%, respectively. The full fin has the lowest heat transfer enhancement of 43% among the three configurations.
| Identifer | oai:union.ndltd.org:TW/105NCTU5489070 |
| Date | January 2017 |
| Creators | Wang,Chen-Chih, 王晨智 |
| Contributors | Liu, Yao-Hsien, 劉耀先 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 50 |
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