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。
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 optimum fin height and number of fins that give the minimum temperature and thermal resistance of the heat sink.Radiation heat transfer could not be ignored for the coupled heat pipe heat sink under natural convection.
出处
《半导体光电》
CAS
CSCD
北大核心
2011年第2期224-227,共4页
Semiconductor Optoelectronics
关键词
筒灯
LED
热管
散热
翅片
downlight
LED
heat pipe
heat dissipation
fin
