摘要
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 was widely applied in the process of metal heat treatment.The surface temperature and heat transfer coefficient of high temperature surface during immersion quenching process were experimentally studied.During the quenching process,the experimental results reveal that the transfer coefficient goes up to a peak near-lineally and then drops down at the gradually dropping temperature.The results show that the relationship between liquid level increasing speed and transfer coefficient is complicated and is not at a monotonous trend.According to the experimental results,a prediction model about the surface temperature VS time is established,which can predict the surface temperature well.
出处
《热加工工艺》
CSCD
北大核心
2012年第18期166-169,共4页
Hot Working Technology
基金
中央高校基本科研业务费资助重点项目(CDJZR10 14 55 01)
关键词
膜态沸腾
实验研究
浸没淬火
film boiling
experimental investigation
immersion quenching
