本文对以蒸馏水为工质,流过内径和外径分别为168 μm、406 μm和399μm、798μm的电加热不锈钢管时的换热进行了实验研究.通过对微钢管直接通电进行加热,并采用红外成像仪及专用放大镜头的非接触式方法,获得了各种恒定加热功率及不同雷诺数下的微钢管壁面的温度场分布,进而得到较为精确的壁面平均温度.由此计算了在层流态下的换热系数Nu数.实验结果表明,在层流下,内径为168 μm及399 μm的微钢管内部的Nu数分别比经典的Hansen准则式所得到的Nu数高出很多.
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