大功率集成LED热管散热器的传热性能  

Heat transfer performance of heat pipe radiator for high power integrated LED

作　　者：王强[1] 王宏[1,2] 廖强[1,2] 朱恂[1,2] 丁玉栋[1,2] 

机构地区：[1]重庆大学工程热物理研究所,重庆400030 [2]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《热科学与技术》2012年第4期312-318,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50906102);重庆市自然科学基金资助项目(CSTC2011jjA90015);中央高校基本科研业务费科研专项自然科学类资助项目(10550229720110084)

摘　　要：针对大功率集成LED单位热流密度高的特点,提出一种新型的翅片式重力热管散热器,并对其传热性能进行了实验研究,讨论了加热功率和充液率对散热器传热性能的影响。实验结果表明:在加热功率为150W、散热热流密度为37.5W/cm2时,翅片式重力热管散热器的系统热阻在0.08～0.33K/W,此时加热表面温度低于80℃,冷凝段管壁温度相差不超过3℃。该散热器不仅具有良好的均温性,且在工况变化时能快速重新达到稳定,满足大功率LED的散热需求。A fin type gravity heat pipe radiator was developed towards high heat flux cooling of integrated LEDs with large power density, and its heat transfer performance was experimentally studied. The effects of heating power and liquid filled content on the heat transfer performance of gravity heat pipe radiator were also discussed. Experimental results show that the overall thermal resistance of the developed heat pipe radiator varied in a range of 0.08-0.33 K/W under 80 ℃ for the heating load of 150 W with respect to the heat flux density of 37.5 W/cm2. Under such condition, the heating surface temperature was lower than 80 ℃ and the wall temperature difference in the condenser section was no more than 3 ℃. Moreover, the heat pipe system could reach the steady state after the operating conditions changed. It is revealed that the developed fin type gravity heat pipe radiator exhibits not only a good heat transfer performance but also a uniform temperature distribution, making it fulfill the requirement of the thermal management of high-power LEDs.

关 键 词：大功率LED 热管 自然对流 热阻 传热性能 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]