矩形微通道中流阻特性的实验研究

以工程上常用的66%的乙二醇水溶液作为工质,对几何特性相似而高宽比不同的4种纯铝矩形微通道内的流动特性进行了实验研究,得到了微通道冷板基础性的设计数据。实验测量了Reynolds数在50~500之间的流动阻力系数。实验结果表明:通道高度H与宽度W之比对微通道流阻特性有显著的影响;当Re数小于100时,在实验误差内,流动阻力系数的值近似等于经典理论计算值;随着Re数的增大和高宽比的变化,f的值远大于理论值,这可能是由微通道内部壁面粗糙度效应所导致的。

Experimental study on flow characteristic in rectanglar micro-channels

Flow transfer characteristics in four geometric characteristics similar to the aspect ratio and different rectangular aluminum micro-channel are studied.All tests are performed with 66% glycol water.Validate experimentally data of resistance performance of parts of micro-channel are got.Reynolds number varies in the range from 50 up to 500 in the present experiment.The experiment results clearly show: The ratio of the channel height to width have a marked impact for the flow resistance characteristics of micro-channel;the friction factors approximately agree with that of classical theory when Reynolds number is below 100 considering the experimental uncertainties;with the increase of Reynolds number and the change of the aspect ratio,the friction factors are more larger than the classical laminar solutions due to the roughness effect.