數值模擬探討矩形流道裝置水平擺放單雙壓電風扇對平板型散熱器熱流特性影響

Numerical Simulation Investigate of Thermal and Flow Characteristics of Plate-fin Heat Sink in Rectangular Channel Flow with installation of Horizontal Single and Twin Piezoelectric Fans

梁谷帆(Gu-Fan Liang)

指導教授 ： 蔡國隆

國立臺北科技大學/機電學院/車輛工程系所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00336

摘要

本研究目的為使用計算流體力學軟體Fluent，以數值模擬方式討論於流道內裝置壓電風扇對平板型散熱器熱流特性之影響。壓電風扇裝置於平板型散熱器前方流道內，將壓電風扇冷流體往散熱器導入，並在流道產生渦流來增強散熱器周遭冷熱流體的混合。數值模擬之各項參數包括、壓電風扇前端至散熱鰭片前端距離(Lg)、壓電風扇至矩形流道底部高度(Hw)以及散熱鰭片數(n)，雙壓電風扇為同向位與相位差改變之影響。
研究結果顯示，將雙壓電風扇裝設在流道內能有效地增強平板型散熱器之努塞爾值。當單、雙壓電風扇高度(Hw)為15mm至散熱器前方位置(Lg)為5mm且雙壓電風扇間距(a)為20mm，裝設位置可增強努塞爾值之效果最佳。其鰭片數10片則會優於鰭片數14片散熱效能，因散熱器流道寬度變大影響到散熱效能提高。

關鍵字

電子冷卻 ； 計算流體力學 ； 壓電風扇 ； 平板型散熱器

並列摘要

The thermal and flow characteristic of plate-fan heat sink in rectangular channel flow with installation of piezoelectric fans which is investigated numerically by Fluent. Twin piezoelectric fans are installed on the flow passage of the channel. The effect of distance between end of (a), distance between tip of piezoelectric fans and front of heat sink (Lg), configuration of piezoelectric fans and rectangular channel flow of height (Hw) and fin number of heat sink (n),Twin piezoelectric fans can be in phase and out of phase.
The results show that the heat transfer can be enhanced of Nusselt number by install single and twin piezoelectric fans properly. The better performance is obtained as Hw=15mm, piezoelectric fans is installed in front of heat sink position as Lg=5mm and twin piezoelectric distance between a=20mm.The efficiency of inserting piezoelectric fans in case of 10 fins is better than of 14 fins. The efficacy of inserting piezoelectric fans increases when the width of heat sink flow channel increases.

並列關鍵字

Electronic Cooling ； Computational Fluid Dynamics ； Piezoelectric Fans ； Heat sink

參考文獻

[20]陳泳豐，反算設計問題於壓電風扇之扇葉位置與形狀最佳化之研究，國立成功大學，碩士論文，2011。

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