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膜态沸腾在金属热处理等过程中有广泛的应用。本文研究了注水过程中高温表面膜态沸腾表面温度和表面换热系数的变化规律。实验发现:换热系数随表面温度的下降接近直线上升到最大值然后下降,液位上升速度对换热系数的影响较复杂,并不是单调的。根据实验数据,建立了表面温度随时间变化的预测模型,模型能很好地预测表面温度的变化规律。
Film boiling in the metal heat treatment process has a wide range of applications. In this paper, the variation law of membrane surface boiling temperature and surface heat transfer coefficient at high temperature was studied. The experimental results show that the heat transfer coefficient increases linearly with the decrease of surface temperature to the maximum and then decreases. The effect of liquid level rising speed on the heat transfer coefficient is complex and not monotonous. According to the experimental data, a prediction model of surface temperature with time is established. The model can predict the variation of surface temperature well.