渦漩產生器對三維流道中凸塊熱源模組之共軛熱傳特性及冷卻效能提升之研究

Heat Transfer Enhancement of Block Heat Source Module inside a Rectangular Channel by Using Vortex Generator

莊詠淋(Yong-Lin Zhuang)

指導教授 ： 蔡永利

國立虎尾科技大學/工程學院/航空與電子科技研究所/碩士(2012年)

https://doi.org/10.6827/NFU.2012.00136

摘要

本研究旨在針對三維流道中載裝有間隔凸塊熱源模組之系統，於模組前方安裝平板組成的渦漩產生器，探討其造成模組熱傳特性及散熱性能提升的效應。主要目標有二方面，首先，探討安裝渦漩產生器對三維流道中流體流動、溫度分佈及間隔凸塊熱源模組之熱傳特性的影響；其次，探討渦漩產生器之不同配置對於熱源模組冷卻效能的提升效應。
本研究係以數值方法進行嚴謹的模擬，另外，為驗證數值模擬正確性，本研究建置實驗系統來量測熱源模組之凸塊表面溫度。比較實驗數據與數值模擬數據結果，發現其相對誤差介於5－20%。
本研究結果顯示，當Pr = 0.7、Re = 600、Fl = 0.4、Ft = 0.04、Kbf = Kpf = 100時，在熱源模組前方安裝Fh = 0.2、α = 50°之渦漩產生器，可降低熱點溫度達21%；當考慮不同渦漩產生器間距時，結果顯示最佳間距為0.1；當增加渦漩產生器高度時，對於熱源模組的冷卻效益也隨之增加，在渦漩產生器高度Fh = 0.4時，其熱點溫度可減少達31%；當渦漩產生器放置高度在0≦Fy≦0.6情況下，結果顯示，在Fy = 0.3時，為較佳安裝高度；當200≦Re≦1200時，結果顯示，雷諾數越大，安裝渦旋產生器對於模組熱點溫度降溫效果越好，可降低熱點溫度達37%。另外；當熱源模組數量增加至二個時，在熱源模組前方安裝Fh = 0.8、α = 50°之渦漩產生器，可降低熱點溫度達15%。

關鍵字

熱源模組 ； 渦漩產生器 ； 縱向渦漩 ； 數值模擬 ； 實驗量測

並列摘要

This study aims to investigate the conjugate conduction-forced convection heat transfer characteristics and cooling performance enhancement for discrete block heat source modules inside a rectangular channel by using vortex generator. The vortex generator is formed by two plates. The major objective of this study has two aspects. First, the influences of vortex generators on the velocity and temperature distribution of fluid flow and heat transfer of discrete block heat source module in a three dimensional channel are rigorously studied. Second, the cooling performance enhancement of block heat source modules for various arrangement of vortex generator is explored.
The numerical simulation is rigorously performed in this study. In addition, an experimental system is set up to verify the results of numerical simulation. The difference in surface temperature of block heat source between the numerical and experimental data is in the rang of 5-20%.
The results show that the maximum difference in hot spot temperatures of the blocks for the systems with and without installation of Fh = 0.2、α = 50° vortex generator can be up to 21% as Pr = 0.7、Re = 600、Fl = 0.4、Ft = 0.04 and Kbf = Kpf = 100. When plate spacing 0≦S≦0.4, enhancement is more effective for the vortex generators with S = 0.1. The heat transfer characteristics increase with higher generator. The hot spot temperature can be reduced by 31% for the generators with Fh = 0.3. When vortex generator position 0≦Fy≦ 0.6, the result show that the optimum position of generator is Fy = 0.3. In addition, The enhancement is more effective for larger Reynolds number. The hot spot temperature can be reduced by 37% for 200≦Re≦1200. Furthermore, The hot spot temperature can be reduced by 15% for the system with two heat source modules.

並列關鍵字

heat source module ； vortex generator ； longitudinal ； simulation ； experiment

參考文獻

[1] R. Grimes and M. Davies, Air Flow and Heat Transfer in Fan Cooled Electronic Systems, ASME J. Electronic Packaging, Vol. 126, pp.124-134 (2004)

[2] A.K. da Silva, S. Lorente and A. Bejan, Optimal Distribution of Discrete Heat Sources on a Plate with Laminar Forced Convection, Int. J. Heat Mass Transfer, Vol. 47, pp. 2139-2148 (2004)

[3] H. Gunes and A. Liakopoulos, Three-Dimensional Convective Cooling in a Vertical Channel with Flush-Mounted Heat Sources, Int. J. Heat Mass Transfer, Vol. 46, pp. 791-808 (2003)

[4] G. Madhusudhana Rao and G.S.V.L. Narasimham, Laminar Conjugate Mixed Convection in a Vertical Channel with Heat Generating Components, Unt. J. Heat Mass Transfer, Vol. 50, pp. 3561-3574 (2007)

[5] A. Narasimhan and B.V.K. Reddy, Laminar Forced Convection in a Heat Generating Bi-disperse Porous Medium Channel, Int. J. Heat Mass Transfer, Vol. 54, pp. 636-644 (2011)