矩形流道內下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 Ground

張瑋鈞(Wei-Chun Chang)

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.2010.00454

摘要

本文使用計算流體力學軟體(FLUENT)，在不同的雷諾數之下，以數值模擬方式探討三角翼對縱向渦流產生器於矩形流道內裝置位置與渦流產生器的結構，以及渦流產生器之各項參數對於平板型散熱鰭片熱流特性的影響。渦流產生器設置位置裝置於流道下壁面且置於平板型散熱鰭片前方，而渦流產生器設置形式針對common-flow-up與common-flow-down兩種結構進行討論。渦流產生器中各項參數包括散熱鰭片之高度、渦流產生器翼對尾端至散熱鰭片前端之距離、渦流產生器翼對間橫向最短距離、渦流產生器翼對間之橫向最短距離、渦流產生器之攻角以及渦流產生器翼對之高度。研究結果顯示，在common-flow-up與common-flow-down兩種結構下比較，common-flow-up會有比較低的熱阻值；再以此結構進行設置位置討論，可在貼於平板型散熱鰭片之處設置渦流產生器以得到最低的熱阻值；再將渦流產生器攻角設定為改變因素，歸納討論出攻角為30度能兼顧散熱效率和流動性能兩者平衡的角度；此外再以不同的平板型散熱鰭片數高度與數目進行熱阻值與壓降值之驗證對照，確認渦流產生器之理想設置位置不會因為不同的參數調整而有所變異。

關鍵字

電子冷卻 ； 計算流體力學 ； 渦流產生器 ； 平板型散熱鰭片

並列摘要

In this thesis, the thermal and flow characteristics of plate-fin heat sink in a rectangular channel flow by inserting delta winglet pair longitudinal vortex generators (LVGs) installed on the ground, in front of the plate-fin heat sink, which is investigated numerically by FLUENT in different Reynolds Numbers. The effects of two different configurations, common-flow-up (CFU) and common-flow-down (CFD), LVGs location, LVGs dimensions, LVGs attack angle and plate-fin heat sink dimensions on the thermal and flow characteristics are performed in detail. The numerical results indicate that the CFU configuration, the LVGs located close to the plate-fin heat sink, the LVGs attack angle β=30° has a better overall performance. The ideal LVGs location and attack angle would not be affected by the verifications of different fin heights and fin number in this thesis.

並列關鍵字

Computational Fluid Dynamics ； Heat sink ； Longitudinal Vortex Generator

參考文獻

[1] S. Naik, S. D. Probert and I. G. Bryden, “Heat Transfer Characteristics of Shrouded Longitudinal Ribs in Turbulent Forced Convection,” International Journal of Heat and Fluid Flow, Vol. 20, No. 4, pp. 374-384, 1999.

[2] M. Ishizuka, Y. Yokono and D. Biswas, “Experimental Study on the Performance of a Compact Heat Sink for LSI Packages,” Proceedings Institution of Mechanical Engineers, Part A, Vol. 214, No. 5, pp. 523-530, 2000.

[3] S. Prstic, M. Lyengar and A. Bar-Cohen, “Bypass Effect in High Performance Heat Sinks,” International Thermal Sciences Conference, Bled, Slovenia, June 11-14, 2000.

[4] S. A. El-Sayed, S. M. Mohamed, A. M. Abdel-latif and A. E. Abouda, “Investigation of Turbulent Heat Transfer and Fluid Flow in Longitudinal Rectangular-Fin Arrays of Different Geometries and Shrouded Fin Array,” Experimental Thermal and Fluid Science, Vol. 26, No. 8, pp. 879-900, 2002.

[5] S. A. El-Sayed, S. M. Mohamed, A. M. Abdel-latif and A. E. Abouda, “Experimental Study of Heat Transfer and Fluid Flow in Longitudinal Rectangular-Fin Array Located in Different Orientations in Fluid Flow,” Experimental Thermal and Fluid Science, Vol. 29, No. 8, pp. 113-128, 2004.