依据实测的固液界面的运动规律和界面上的能量守恒。讨论了一种确定国管外凝国层界面上局部对流换热系数的方法。凝固实验中局部对流换热系数的推算表明：凝固时的局部对流换热系数不同于圆管外单相介质的稳定局部对流换热系数。 According to the measured solid-liquid interface of the law of movement and energy conservation at the interface. A method to determine the local convective heat transfer coefficient at the condensing layer boundary outside the national tube is discussed. The calculation of the local convection heat transfer coefficient in the solidification experiment shows that the local convection heat transfer coefficient during solidification is different from the steady local convection heat transfer coefficient of single-phase medium outside the tube.