Enhanced cooling for LED lighting using ionic wind
Enhanced cooling for LED lighting using ionic wind
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DOI：
10.1016/j.ijheatmasstransfer.2012.10.015
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发表时间：
2013-01
影响因子：
5.2
通讯作者：
I. Chen;M. Guo;Kai-Shing Yang;Chi-Chuan Wang
中科院分区：
文献类型：
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作者：
I. Chen;M. Guo;Kai-Shing Yang;Chi-Chuan Wang
本研究采用离子风来增强安装在衬底上的LED的传热。LED芯片的尺寸为0.9mm×0.9mm，标称功率为1W。采用针型电极产生离子风，外加电压为4 ~ 11kV。本研究考察了排列角度、电极极性、分离距离和接地配置对LED衬底热阻的影响。在相同的施加电压下，负极的热阻似乎比正极的热阻低，负极的工作范围也更大。在测试范围内，热阻可降低50%。当对准角从0°增加到20°时，热阻略有降低，但进一步增加对准角不会进一步降低热阻。研究发现，针与地电极垂直分离距离的影响略高于水平分离距离的影响。试验结果还表明，网状接地电极的热阻比点电极或线电极的热阻略低。
This study employs ionic wind to augment heat transfer of a LED mounted on a substrate. The size of the LED chip is 0.9mm×0.9mm with a nominal power of 1W. A needle type electrode is used to generate ionic wind with the applied voltage ranging from 4 to 11kV. The effects of aligned angle, electrode polarity, separation distance, and ground configuration on the thermal resistance of the LED substrate are examined in this study. For the same applied voltage, it appears that the thermal resistance for the negative polarity is lower than that for the positive one and the negative electrode also has a wilder operation range. The thermal resistance can be reduced as much as 50% in the test range. The thermal resistance is slightly reduced when the aligned angle is increased from 0° to 20°, but a further increase of aligned angle casts no further reduction on the thermal resistance. It is found that the influence of vertical separation distance between the needle and ground electrode is moderately higher than that of horizontal separation distance. Test results also indicate that the mesh ground electrode shows moderately lower thermal resistance than those of point or line electrode.