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.
出处
《热科学与技术》
CAS
CSCD
北大核心
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)
关键词
大功率LED
热管
自然对流
热阻
传热性能
high power LED
heat pipe
natural convection~ thermal resistance
heat transferperformance
