Analysis of thermal flow around heat sink with ionic wind for high-power LED
Analysis of thermal flow around heat sink with ionic wind for high-power LED
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DOI：
10.1016/j.applthermaleng.2018.07.118
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发表时间：
2018-10
影响因子：
6.4
通讯作者：
D. Shin;D. Sohn;H. Ko
中科院分区：
文献类型：
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作者：
D. Shin;D. Sohn;H. Ko
本文提出了一种新的方法，主动冷却发光二极管（LED）的应用，使用离子风，这是一个流动的电晕放电在弯曲的电极尖端诱导。分析了大功率LED散热器周围的热流，并对离子风在散热器中的应用进行了研究。详细研究了200 W-LED散热器周围自然对流的数值研究。通过温度实验数据验证了计算流体力学（CFD）方法的可靠性。粒子图像测速（PIV）测试进行了分析的行为，周围的散热器的离子风。分析了散热器翅片周围的热流动，得出了圆柱形散热器中心柱对散热性能没有影响的结论。同时，将从金属丝电极到圆柱电极的离子风应用于散热器，以增强散热性能。其结果是，最佳的半径的线曲率和输入电压的离子风被发现是110毫米和7.5千伏，分别。通过离子风使热沉的传热系数从96.7 W/m2 K提高到133 W/m2 K，提高了37%，实验证实了这一点。并且，在0.6W的施加功率下，与原始热沉相比，通过离子风，热沉的冷却性能最大提高了148%。本研究的结果可用于各种各样的离子风应用，作为一种有前途的LED冷却器技术。
This paper presents a new method of active cooling for a Light Emitting Diode (LED) application using the ionic wind which is a flow induced by a corona discharge at a tip of a curved electrode. Thermal flow around a heat sink for a high-power LED was analyzed and the ionic wind was investigated for the heat sink application in this study. Details of a numerical investigation of natural convection around the heat sink for the 200 W-LED were studied. The reliability of the computational fluid dynamics (CFD) was verified by experimental data of temperatures. A particle image velocimetry (PIV) test was performed to analyze the behavior of the ionic wind around the heat sink. The thermal flow around the heat sink fins was analyzed and it was concluded that the center pole of the cylindrical heat sink was unnecessary for the cooling performance. And, the ionic wind from a wire to cylinder electrode was applied to the heat sink to enhance the cooling performance. As a result, the optimum radius of the wire curvature and input voltage for the ionic wind were found to be 110 mm and 7.5 kV, respectively. The heat transfer coefficient of the heat sink increased by 37% from 96.7 to 133 W/m2K by the ionic wind, which was confirmed experimentally. And, the cooling performance of the heat sink was enhanced by 148% in maximum by the ionic wind compared with that of the original heat sink for 0.6 W of the applied power. The result of this study can be used for the wide variety of the ionic wind application as a promising technology for the LED cooler.