圆形微通的对流换热特性研究  

Heat Transfer in Circular Microchannel

作　　者：刘焕玲[1] 贾建援[1] 殷磊[1] 

机构地区：[1]西安电子科技大学机电工程学院,西安710071

出　　处：《电子科技大学学报》2009年第3期476-480,共5页Journal of University of Electronic Science and Technology of China

基　　金：部级预研基金

摘　　要：针对圆形微通道内流体的强迫对流问题,利用分离变量法求解了考虑轴向热传导、速度滑移和温度跳跃、粘度耗散和入口效应等因素的圆形微通道的控制方程,给出了流体温度场和努塞尔数的计算表达式。对圆形微通道换热特性进行了数值仿真,结果表明,受尺寸效应的影响,管径越小,平均对流换热系数越大。微通道的换热能力比宏观经典通道强,表明在相同面积上做多个微通道比一个宏观大通道的换热效果好。Forced convection of the circular microchannel is analyzed. The governing equations of circular microchannel are solved by separation of variables, with the considerations of axis conduction, viscous dissipation, thermal entrance and velocity slip. Then the expressions of temperature field and Nusselt number at uniform wall temperature conditions are achieved. Simulation of heat transfer is conducted. It is shown that the average heat transfer coefficient of microchannel is larger than maerochannel when the radius decreases for the small size effect, which means that face the average heat transfer coefficient of several microchannels on the same surface area is lager than that of one macrochnnel.

关 键 词：轴向热传导 强迫对流 努塞尔数 速度滑移 温度跳跃 热入口效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]