结构形式对微槽内流动换热特性的影响  

Effect of Channel Structures on the Fluid Flow and Heat Transfer in Micro-Channels

作　　者：刘东[1] 蒋斌[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《激光与光电子学进展》2013年第4期102-107,共6页Laser & Optoelectronics Progress

基　　金：四川省教育厅重点基金(11ZA132&11ZB110);西南科技大学博士基金(11zx7159)资助课题

摘　　要：针对矩形、三角形和梯形3种微结构换热器内的流动和换热特性进行分析,并采用数值模拟的方法计算不同高宽比情况下3种微槽道结构散热器的流动和换热特性。结果表明:微槽道的摩阻系数随着雷诺数Re的增加而降低,但是随着高宽比的增加而增大;在相同的Re和高宽比时,矩形槽道的摩阻系数最大,三角形槽道的摩阻最小;当槽道类型和高宽比确定时,努塞尔数Nu随着Re的增加而增加,但是增加趋势逐渐趋于平缓。考虑进口效应等因素的影响,对不同槽道内的换热特性进行分析,给出了符合不同结构槽道的换热关系式。The fluid flow and heat transfer characteristics of rectangular, triangular and trapezoidal micro-channels are analyzed. The influence of height-width radio and channel types on these characteristics is simulated. The results show that the coefficient of friction resistance decreases with the increase of Reynolds number but increases with the rise of aspect ratio in micro-channels. At the same Reynolds number and aspect ratio, the maximal coefficient of friction resistance appears in the rectangular structure, and the minimal one in the triangular micro-channel. When the channel type and the aspect ratio are fixed, the Nusselt number increases with the Reynolds number, but the increasing trend is slow. General empirical formulas are proposed to evaluate the heat transfer performance of different micro-channels with consideration of inlet effect and height-width ratio.

关 键 词：测量 激光器 冷却 微槽道 流动 换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]