矩形流道上壁面裝置三角翼型縱向渦流產生器對平板型散熱器熱流特性影響之數值研究

Numerical Study of Thermal and Flow Characteristics of Plate-fin Heat Sink in Rectangular Channel Flow with Delta Winglet Pair Longitudinal Vortex Generator Installed on the Ceiling

謝長恩(Chang-En Hsieh)

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(2010年)

https://doi.org/10.6841/NTUT.2010.00461

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橫流道內上壁面裝置三角翼型渦流產生器對平板型散熱器熱流特性之影響。渦流產生器裝置於平板型散熱器前方流道上壁面，將冷流體往散熱器導入，並在流道產生縱向渦流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、渦流產生器翼對間橫向最短距離(a)、渦流產生器翼對尾端至散熱鰭片前端距離(Lg)、渦流產生器攻角(β)、渦流產生器翼片面積(Aw)、散熱鰭片數(n)以及散熱鰭片高度(Hf)。
研究結果顯示，適當的裝置渦流產生器於橫流道內上壁面能降低平板型散熱器之熱阻值，尤其以低雷諾數Re=10000時影響較大。渦流產生器攻角β=30°、三角翼片的面積Aw=2025 mm2，在熱阻值及壓降能獲得較好的表現。三角翼片前端與橫流道壁面接合 (a=1.11H)以及三角翼對尾端至散熱鰭片前端距離Lg =6.0H，整體表現較佳。裝置渦流產生器在散熱鰭片數n=20時，改善熱阻值以及流場結構的影響比在n=10明顯。裝置渦流產生器對於降低熱阻值的助益，隨著散熱鰭片高度的增加而降低。

關鍵字

電子冷卻 ； 計算流體力學 ； 渦流產生器 ； 平板型散熱片

並列摘要

The thermal and flow characteristic of plate-fin heat sink in rectangular channel flow with delta winglet pair longitudinal vortex generator (DWPLVG) is investigated numerically by Fluent. The vortex generator is installed on the ceiling of the channel. The effect of minimum transverse distance between winglets(a), distance between LVG(Lg) and heat sink, attack angle of LVG(β), area of winglet(Aw), number of fins(n) of heat sink and height of fin(Hf) are examined in detail.
The results show that the heat transfer can be enhanced by inserting vortex generator properly. The better overall performance is obtained as Re=10000, β=30°, Aw =2025mm2, a=1.11H, Lg=6.0H. The efficiency of inserting LVG in case of 20 fins is better than that of 10 fins. The efficiency of inserting LVG decreases when the height of fin increases.

並列關鍵字

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

參考文獻

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