光热一体化微槽群散热器传热性能研究  

Study on the Heat Transfer Performance of the Photothermal Integrated Microgrooves Heat Sink

作　　者：董宜放 于樱迎 胡学功[2] 裴刚[1] DONG Yifang;YU Yingying;HU Xuegong;PEI Gang(Department of Thermal Science and Energy Engineering,University of Science and Technology of China,HeFei 230027,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;Nanjing Institute of Future Energy System,Nanjing 211135,China)

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027 [2]中国科学院工程热物理研究所,北京100190 [3]中科南京未来能源系统研究院,南京211135

出　　处：《工程热物理学报》2022年第6期1643-1649,共7页Journal of Engineering Thermophysics

基　　金：国家重点研发计划资助(No.2017YFB0403200)。

摘　　要：传统微槽群散热器(TMHS)因散热能力强、无功耗等优点,在LED散热领域广泛应用。然而,TMHS与LED光源基板之间需热界面材料填充,导致产生界面热阻,影响散热效果。为消除界面热阻,提高TMHS散热性能,实现大功率LED散热器小体积、轻量化,本文提出在LED光源基板上加工微槽,并将其与TMHS微槽取热表面设计成一体化器件,形成光热一体化微槽群散热器(PIMHS)。实验表明,PIMHS具有良好的散热能力、均温性能、光学参数以及可靠性。LED光源输入功率500 W时,PIMHS与TMHS相比,热阻下降4.5倍,LED光源表面温度下降30.34%,光效提升28.8%。并且,PIMHS可实现kW级LED光源散热,横向、纵向温差均小于1℃。Traditional microgrooves heat sink(TMHS)has been widely used in LED cooling field due to the strong heat dissipation capability and zero energy consumption.However,the thermal interface material is needed to fill the gap between the heat sink surface and the LED light source substrate,which will produce large interface thermal resistance and inevitably affect the heat emission effect.In order to eliminate the interface thermal resistance,improve the heat dissipation performance of TMHS,and make the high-power LED heat sink small-volume and light-weight,a sepcific photothermal integrated microgrooves heat sink(PIMHS)is proposed in this paper.The PIMHS integrates the LED light source substrate machined with microgrooves and the microgrooves surface of the TMHS.The results show that PIMHS has incomparable heat dissipation potential,fair temperature uniformity and nice optical parameters,leading to a great reliability.When the input power of LED light source is 500 W,compared with TMHS,the thermal resistance of PIMHS decreases 4.5 times,the surface temperature of LED light source decreases 30.34%,and the light efficiency increases 28.8%.In addition,PIMHS can achieve transverse and longitudinal temperature differences of less than 1℃ for the kW-level LED light source heat dispassion.

关 键 词：LED 光热一体化微槽群散热器 传统微槽群散热器 界面热阻 

分 类 号：TK124[动力工程及工程热物理—工程热物理]