碩士 / 國立虎尾科技大學 / 機械與機電工程研究所 / 100 / The overheating problem of electronic components has been the serious challenge for designers to face. With the minimizing design concept of semiconductor component manufacture, the size of electronic components reduces gradually. At the same time, with the electronic component demanded power rising, the heat generation of per unit area also increases significantly. Therefore, how to improve the heat removal performance of electronic components has become an important research issue. Because impingement jet combining with heat sinks has local cooling, rapid heat removal advantages, it can rapidly remove heat from electronic components. There are more and more researchers devoting their efforts to this topic.
In this study, numerical investigation of thermal and fluid flow phenomena of a cylindrical pin-fin heat sink under different nozzle inlet velocities, distances from the nozzle to the top of the heat sink, nozzle diameter, space between nozzles, for single or double nozzle type air impinging-jet cooling has been conducted by using FLUENT computational fluid dynamics software. The results showed that increasing the nozzle inlet velocity will reduce the thermal resistance, but the decline decreases gradually at high flow rate. Distance from the nozzle to the top of the heat sink too close and too far will affect the heat transfer efficiency. According to the numerical simulations, an appropriate distance is the distance between 36~63mm. The larger diameter of the nozzle will induce more cooling flow to heat sink surface and lower thermal resistance. Nozzle spacing at low Reynolds number, 12mm is the best distance. At high Reynolds number and the large diameter of the nozzle condition, a better spacing can be stretched to 14mm. Summarily, a double-nozzle impingement-jet flow has better thermal performance.
| Identifer | oai:union.ndltd.org:TW/100NYPI5490065 |
| Date | January 2012 |
| Creators | Jian-Siang Chen, 陳建祥 |
| Contributors | Tswen-Chyuan Jue, 朱存權 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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