LED筒灯复合结构热管散热器的数值模拟

Numerical Simulation of Coupled Heat Pipe Heat Sink for LED Downlights

摘要:

为解决LED筒灯使用单纯自然对流散热扩散热阻过大、温度分布不均的问题,提出一种基于平板热管和热虹吸管的复合结构热管散热器,并用数值模拟的方法研究了热功率、翅片高度、翅片数目、辐射换热对该散热器性能的影响。模拟结果表明应用于LED筒灯的复合结构热管散热器的热阻随着热功率的增加而减小,翅片高度和翅片数目存在一个最优值,使得散热器温度和热阻最小,自然对流情况下不可忽视辐射换热的作用。

Abstract:

A coupled heat pipe heat sink based on flat heat pipe and thermosyphon was proposed for LED downlights to overcome high thermal spreading resistance and nonuniform temperature under pure natural convection.Numerical study was performed to evaluate the effect of fin height,number of fins,heating power and radiation heat transfer on the heat dissipation performance of the heat sink.The results indicated that the thermal resistance of the heat sink decreased with the increase of the heating power.There is an o...