小尺度沟槽表面和近距离布置光面构成通道中传热特性数值研究

Numerical Investigation of the Heat Transfer Characteristics in a Channel with One Surface Having Mini-Grooves in the Flow Direction and a Plain Surface Located at a Mini-Distance

针对IGBT的冷却问题,通过三维数值模拟方法对一种微槽结构散热器内部的换热特性进行了研究。由于IGBT所需散热面积较大,常规微米级尺度的微槽通道在满足换热要求的同时往往需要消耗较大的泵功率,据此提出一种小尺度沟槽表面通道结构,以水为冷却剂对通道内充分发展层流流动换热特性进行了数值研究,并与平表面通道内换热特性进行对比。结果表明:新型微槽表面通道可有效增强对流换热效果,且对流换热系数随着雷诺数的增大而增大。

The numerical investigation of the heat transfer characteristics in the mini-grooved surface channel as for IGBT cooling problem is conducted.The nomal micro-channel can offer a high convective heat transfer coefficient,however,it was hard to implement because of its very high pressure head required high pump power as the IGBT surface area is large.Thus,a mini-grooved surface channel is proposed in heat sink with a quite high heat flux and a mild pressure loss.A channel formed by one mini-grooved surface and an opposite plain surface with a mini-distance is analyzed numerically for the fully-developed laminar flow with water as coolant,and the heat transfer characteristics were compared with plain-surface channel.It is found that the mini-grooved channel could augment heat transfer considerably,the average Nusselt number in the mini-grooved channel increases with the Reynolds number with a relatively high but acceptable pressure drop.