矩形流道下壁面裝置三角翼型縱向渦流產生器對方柱型散熱器熱流特性影響之數值研究

本文使用計算流體力學軟體Fluent，以數值模擬方式討論於矩形流道內下壁面裝置三角翼型渦流產生器對方柱型散熱器熱流特性之影響。渦流產生器裝置於矩形流道內下壁面，改變矩形流道內之流場結構，進而影響熱流特性。數值模擬探討之參數包括雷諾數(Re)、渦流產生器翼對尾端至散熱器前端距離(Lg)、渦流產生器尾端間距(a)、渦流產生器攻角(β)與長度(Lw)、渦流產生器配置、散熱器鰭片寬度(Wf)以及高度(Hf)。研究結果顯示，在雷諾數越低時，熱阻值的影響越大。渦流產生器需裝設於適當的位置才能有效降低方柱型散熱器之熱阻值，其中以裝置於三角翼對尾端貼齊散熱器前端頂點或是貼齊散熱器尾端頂點，且在渦流產生器攻角β=30°與三角翼對長度Lw=90mm時，熱阻值與壓降能有較佳之表現。在不同渦流產生器配置下，若在相同之熱阻值下，則common-flow-up(CFU)有比common- flow-down(CFD)較低之壓降。渦流產生器對不同散熱器尺寸比較，雖然散熱器鰭片寬度Wf=9.5mm有最多的熱阻值改變，但在散熱器鰭片寬度Wf=8mm有最低之熱阻值，且在相同的散熱器鰭片寬度下，同時考慮熱阻與壓降，散熱器鰭片高度Hf=45mm為較佳之散熱器尺寸。

關鍵字

電子冷卻；計算流體力學；渦流產生器；方柱型散熱器

並列摘要

This study presents the thermal and flow characteristic of pin-fin heat sink in rectangular channel with delta winglet longitudinal vortex generator(DWPLVG) by using numerical method with CFD software Fluent. By installed on the ground of the channel, the vortex generator changes both flow and thermal characteristic. The parameters are discussed in detail, such as Reynolds number(Re), distance between LVG and heat sink(Lg), distance between end of winglet pair(a), attack angle(β), length(Lw) of LVG, two types of vortex configuration, the pin-fin thickness (Wf) and height(Hf) of heat sink. The Results show that the lower Reynolds number, the more thermal enhancement. The better overall performance is LVG attached on the front tip or end tip of heat sink with β=30° and Lw=90mm. In the same thermal performance, the common-flow-up has lower pressure drop than the common-flow-down. Wf=9.5mm has the most thermal effectiveness, but Wf=8mm has the best thermal performance, and in the same Wf condition, Hf=45mm has lower pressure drop.

並列關鍵字

Electronic Cooling ； Computational Fluid Dynamics ； Vortex generator ； Heat sink

參考文獻

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國際替代計量

矩形流道下壁面裝置三角翼型縱向渦流產生器對方柱型散熱器熱流特性影響之數值研究

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