水冷热管针翅散热器换热性能数值模拟

Numerical simulation on thermal performance of water-cooled heat pipe pin-fin heatsink

针对目前大功率激光器存在的冷却问题,分析现有冷却方法的优缺点,提出了利用水冷热管针翅散热器解决其散热问题。采用有限容积法研究水冷热管针翅散热器的稳态换热性能,分析热管数量、热管高度、热管直径及翅顶空隙率对散热器换热性能的影响,建立水冷热管针翅散热器的物理模型并进行数值模拟。结果表明:在雷诺数Re为32 300的情况下,热管数量从36根增加到64根时,流体的平均努塞尔数Nu趋于497;热管高度从25mm增至35mm时,Nu下降7.86%,摩擦系数下降10.7%;热管直径从6mm到10mm时,Nu增加77.72%,但摩擦系数增加890.53%;翅顶空隙率从0到0.5时,Nu下降40%,摩擦系数下降44%。研究结果对水冷热管针翅散热器的设计、优化具有一定的指导意义。

In order to solve the cooling problems of high power laser,a new method is put forward,on the basis of analyzing the advantages and disadvantages of existing cooling methods. By using the finite volume method,the steady-state thermal performance of heatsink are investigated by taking account of the heat pipe number, the heat pipe height, the heat pipe diameter and clearance ratios. A physical model of the heat- sink is built, then the numerical simulation of the model is carried out. The results show that, when the Reynolds number is 32300,the average Nusselt number tends to 497 with the increasing number of the heat pipe from 36 to 64. When the heat pipe height increases from 25 mm to 35 mm,the average Nusselt number decreases by 7.86% ,and the friction coefficient reduces by 10.7%. When the heat pipe diameter increases from 6 mm to 10 mm,the average Nusselt number grows by 77.72% while the friction coefficient drops by 890.53%. When the clearance radios increases from 0 to 0. 5, the average Nusselt number decreases by 40% ,at the same time,the friction coefficient decreases by 44%. The research results are helpful for opti- mizing design of the heat pipe pin-fin heatsink.