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Experiment of compact oscillating heat pipe for high-power LED cooling |
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To realize the efficiently thermal management of high-power LED, the compact oscillating heat pipe (OHP) was fabricated with sintered copper particles inside flat-plate evaporator. Ethanol was used as working fluid with volumetric filling ratios ranging from 30% to 50%, and the effects of inclination and filling ratios on the temperature and the illumination intensity of LED chips were discussed experimentally. The results show that the OHP with flat-plate evaporator has the best start-up performance at the filling ratio of 30%, and the start-up time is decreased with the increasing of input power. The temperature distributions of LED chips at different inclination angles are almost coincident with good uniformity when the designed OHP is charged with low filling ratios. The influence of inclination angle on the operation and performance of OHP is gradually increased when the filling ratio is increased to 50%. Due to the negative correlation between temperature and illumination of LED chips, the OHP with low filling ratios can achieve high-power LED operation with high luminous efficiency at lower temperature.
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Received: 29 January 2019
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