碩士 / 國立臺灣海洋大學 / 機械與輪機工程學系 / 92 / ABSTRACT
Nowadays, with continuous development of technology, computers not only are developed towards light and handy, but also can be operated at a high speed. However, the high speed of the central processing units (CPU) increased the heat source from the chip dramatically. In order to decrease the load on computers and prevent any possible heat concentration, how to increase the heat dissipation efficiently is therefore becoming one of the keys to the CPU thermal designers.
Based on simulation software, FLOTHERM, this study was divided into four parts. Firstly, three kinds of fins were compared (one-dimensional, two-dimensional, three-dimensional) , the errors of the conduction heat transfer analytic solutions and numerical solutions were within 2.0%. It is proved that this software’s accuracy and availability in the heat conduction analysis. Secondly, according to the results obtained from correlation of experimental Nusselt number, the longer the thermal entrance region in the rectangular tube, the higher the convection heat transfer coefficient. It was different from the formula we used before. Thirdly, the relationships between different Reynolds number and the thermal entrance region were examined, it was shown that Nusselt number would be higher if Reynolds number were higher, but the length of the thermal entrance region would not become longer even though Reynolds number became larger. Finally, an experiment on the staggered fin array and the plate fin array was studied to evaluate the convection heat transfer coefficient and the heat transfer rate. In the case of maintaining the same area of heat dissipation, it is proved that the staggered fin array was more thermally efficient than the plate fin array.
| Identifer | oai:union.ndltd.org:TW/092NTOU5491039 |
| Date | January 2004 |
| Creators | Chuan-Tung Huang, 黃川東 |
| Contributors | , 楊國誠, 雷顯宇 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 98 |
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