通常，对流换热系数是在实验中以电加热试验管壁面后根据牛顿冷却定律计算得来的。
Normally, coefficient of convective heat transfer is gotten through experiments which is heating testing tube by electricity and computed through Newton cooling law.
一般通过实验的方法求得，即运用牛顿冷却公式求出管外对流换热系数，进而求得管外努谢尔数。
It is generally obtained by the experimental method, namely using Newton cooling formula to get tube outside heat transfer coefficient, then get the tube outside Nusselt number.
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