连铸结晶器传热边界条件研究

Study on Thermal Boundary Conditions in the Mold for Continuous Casting

在对结晶器传热数学模型中广泛使用的给定铸坯与结晶器界面间热流密度以及给定铸坯与结晶器界面间传热系数两种不同形式的传热边界条件进行分析与综合的基础上,提出把传热系数形式的传热边界条件式转换为热流密度形式的传热边界条件式的方法。利用传热系数公式中的已知热阻,结合结晶器的热平衡条件,计算热流密度公式中的系数,使原来必须由实测确定的系数成为两个容易计算的量,为确定热流密度形式的传热边界条件式和简化计算提供了便利条件。计算实例表明,在不具备实测条件的情况下,结合目前对传热系数的研究成果,所提出的方法能方便且准确地确定热流密度形式的传热边界条件式。

On the basis of analysis and synthesis of the two type of different thermal boundary conditions, a method was developed, which can convert the thermal boundary conditions written by the heat transfer coefficient style into the thermal boundary conditions written by the heat transfer density style. In the heat transfer density formula （q=A-B√τ）, the values of A and B should be obtained by experimentation under real situation. If there is no test condition with real situation, the developed method can be used and the values of A and B can be calculated easily, considering the known thermal resistances in the heat transfer coefficients formulae published by the other researchers.