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
摘要 为实现大功率LED装置的高效热管理，制作了带平板蒸发器的紧凑型脉动热管，热管蒸发器内部进行烧结铜粉处理.以乙醇为工质，体积充液率为30%~50%，试验研究了改变热管倾角和充液率情况下对LED背板温度和照度的影响.结果表明：带平板蒸发器的紧凑型脉动热管在充液率为30%时，表现出最佳启动性能，其启动耗时随着加热功率的增大而缩短；低充液率时，热管倾角对LED背温影响较小，呈现出较好的均温性能；当充液率增大至50%时，倾角对热管运行和性能影响逐渐增大； LED 背温和照度呈现负相关，低充液率下脉动热管可以有效降低大功率LED的工作温度并提高其高发光效率.
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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2020, Vol. 41 
