中文摘要：

针对大功率发光二极管（Light-emitting diode,LED）具有的高热流通量、表面温度要求严格控制的特点,提出一种新型高效的基于多孔微热沉系统的散热技术来满足大功率LED散热封装的需求。分析多孔微热沉系统的工作原理以及传热特性,基于局部热力学平衡建立多孔微热沉流动与传热的数学模型,并用SIMPLE算法进行数值求解,得出微热沉的温度分布以及影响微热沉性能的一些因素。数值研究表明：在高热流密度下,微热沉散热表面的温度能维持较低水平,即使在热流达到200W/cm2时,散热表面的最高温度才55.2℃;提高工质入口流速可以降低微热沉内的温度以及散热表面的温度水平。多孔微热沉系统能够有效地解决大功率LED的散热问题,提高LED芯片的可靠性与使用寿命。

英文摘要：

In view of the characteristics of high power light-emitting diode（LED）,such as high heat fluxes and requirement of strict temperature control,a porous micro heat sink system is presented for thermal management of high power LED,which has high heat transport capability.The working principle and heat transfer characteristics of porous micro heat sink are analyzed.Numerical model for the micro heat sink is proposed to describe liquid flow and heat transfer based on the local thermal equilibrium of porous medium,and it is solved with SIMPLE algorithm.The numerical results show that the heated surface temperature of porous micro heat sink is low at high heat fluxes and the maximal temperature of heated surface is only 55.2 ℃ at the heat flux of 200 W/cm2.Increasing inlet fluid velocity can decrease the temperature in the micro heat sink and the heated surface temperature.The micro heat sink has good performance for the cooling of high power LED,and it can improve the reliability and life of LED.The numerical results obtained are useful for performance optimization and design of porous micro heat sink.