微米肋條縱向渦漩產生器對於三維微流道散熱基座之共軛熱傳特性及冷卻效能提升之研究

Conjugate Heat Transfer Characteristics and Cooling Performance Enhancement of Microchannel Heat Sink with Micro-Ribs to Induce Longitudinal Vortices

嚴子謙(Tzu-Chien Yen)

指導教授 ： 蔡永利

國立虎尾科技大學/工程學院/飛機工程系航空與電子科技碩士班/碩士(2017年)

摘要

本研究旨在針對流道壁面安裝縱向渦漩產生器，探討三維微流道散熱基座之強制對流共軛熱傳特性及散熱性能提升。首先，探討安裝肋條對微流道中流體流動及溫度分佈的影響；之後，探討肋條不同配置對於微流道散熱基座冷卻效能之提升。此系統之物理模型是以矽基材為散熱基座，以水作為冷卻工作流體。本研究係使用計算流體動力學模擬軟體(CFD-ACE) 並使用SIMPLE和SIMPLEC之數值方法進行數值模擬。
本研究結果顯示，有安裝肋條比沒有安裝肋條之三維微流道散熱基座
，其熱點溫度有顯著的降低。對於增加肋條數目及增加肋條寬度所得到之壓力降同時也會增加，以冷卻液的壓力降和熱點溫度為考量的效益參數，本文發現在不同條件下，有最佳的肋條寬度和肋條數目之配置。比較有安裝和沒有安裝肋條渦漩產生器的數值模擬結果，所探討的案例顯示散熱基座的熱點溫度之降低，最佳可達54.12％；另外，當200 ≦ Re ≦ 1200時，結果顯示雷諾數越大其微流道熱點溫度降溫效果越好，而受到肋條所造成之壓力降比會顯著升高，因此會降低其效益提升，但還是可以明顯提升散熱基座的散熱性能。

關鍵字

三維微流道散熱基座 ； 微米肋條 ； 縱向渦漩 ； 熱傳增進

並列摘要

This study aims to investigate the conjugate conduction-forced convective heat transfer characteristics for the three dimensional microchannel heat sink﹐and cooling performance enhancement with installation of the longitudinal vortex generator onto the channel walls. First﹐the influences of ribs on the fluid flow﹐temperature distribution and heat transfer for a three dimensional microchannel heat sink are investigated. Second, the cooling performance enhancement of the heat sink for various arrangement of ribs is explored. The physical system is a silicon substrate﹐water is used as the cooling working fluid for heat dissipation. A computational fluid dynamics software (CFD-ACE) with the SIMPLE and SIMPLEC techniques are used. The numerical simulation is rigorously performed in this study.
The results indicate that the hot spot temperatures for the cases with ribs constructed on the microchannel walls are significantly lower than those without ribs. The pressure drop increases with the increasing in rib numbers and rib width. It is noted that there exists optimal rib width and rib numbers for considering the hot spot temperature of heat sink and pressure drop of coolant. Comparing the results for situations with and without the rib vortex generator, the maximum reduction in hot spot temperature of heat sink is up to 54.12% for the investigated cases. When 200 ≦ Re ≦ 1200﹐the results show that both the heat transfer characteristics and penalty of pressure drop owing to rib installation increase with Reynolds number.

並列關鍵字

3-D Microchannel heat sink ； Micro-ribs ； Longitudinal vortex ； Heat transfer enhancement

參考文獻

[7]許毓彬, 微渠道散熱器之熱分析與最佳化, 國立成功大學機械工程學系碩士論文, 2010

[1]G. Turkakar, T. Okutucu-Ozyurt, “Dimensional optimization of microchannel heat sinks with multiple heat sources”, Int. J. Thermal Sciences, Vol. 62, pp. 85-92, (2012)

[2]D. B. Tukerman, R. F. W. Pease, “High-performance heat sinking for VlSI”, IEEE Electron Device Letter”, Vol. EDL-2, pp. 126-129, (1981)

[3]P. Naphon, O. Khonseur, “Study on the convective heat transfer and pressure drop in the micro-channel heat sink”, Int. Communications in Heat Mass Transfer, Vol. 36, pp. 39-44, (2009)

[4]J. Li , G. P. Peterson, P. C. Davies, “Three-dimensional analysis of heat transfer in a micro-heat sink with single phase flow”, Int. J. Heat Mass Transfer, Vol. 47, pp. 4215-4231, (2004).