中文摘要：

为了解决大功率LED的散热问题,以数值计算的方法研究平片散热器内部流体的流动换热特性。该文基于COMSOL Multiphysics平台对三种不同湍流模型进行考核,并在此基础上对连续平片和分段平片散热器的散热性能进行比较分析。计算结果表明,标准k-ε模型精度最高;当入口风速由1 m/s增大到9 m/s时,分段平片相对于连续平片换热系数提高了5%~10%,阻力因子降低了3.5%-7.12%。此研究为散热器结构的优化设计提供了理论依据和计算数据。

英文摘要：

Aiming at the heat dissipation problem of the high-power LED, the numerical calculation method is used to study the flow heat interchange characteristic of the fluid inside the plain film heat sink. On the basis of the COMSOL Multiphys- ics platform, three different turbulence models were examined. On this basis, the comparative analysis for the heat dispersion performance of the heat sinks with continuous plain film and discrete plate film was carried on. The calculation results show that the accuracy of the standard k-t： model is the highest; in comparison with the continuous plain film, the heat transfer coefficient of the discrete plate film is increased by 5%-10% and its resistance factor is decreased by 3.5%-7.12% when the inlet velocity is increased from 1 m/s to 9 m/s. This study provides the theoretical basis and calculation data for the optimization design of the heat sink structure.