论文部分内容阅读
在建立板坯连铸一维非稳态凝固传热数学模型的基础上,考虑到液相区的流动和传热状态随拉坯方向的变化,研究了有效导热系数与固相导热系数的比值m(λeff/λs)的处理方法对计算结果的影响。结果表明,在相同的二冷条件下,m取不同的常数对模型计算结果影响很大。在相同的二冷条件下,将m取为常数和取为随拉坯方向变化的变量都可以得到相同的液相穴深度,但二者的凝固壳厚度随拉坯方向的变化有一定的差别,并且出结晶器坯壳厚度差别较大。改变二冷条件,上述二者液相穴深度不再相等。因此,将m取为常数的处理方法是不合理的。
Based on the mathematical model of one-dimensional unsteady solidification and heat transfer in slab continuous casting, the ratio of effective thermal conductivity to solid thermal conductivity The influence of the processing method of m (λeff / λs) on the calculation results. The results show that under the same second cooling condition, taking different constants of m has a great influence on the model calculation results. Under the same second cooling condition, the same depth of liquid phase can be obtained by taking m as a constant and as a variable varying with the direction of the draw, but the thickness of the solidified shell of the two has some difference with the change of the draw direction , And the crystallizer shell thickness difference is bigger. Change the second cooling conditions, the depth of the liquid phase between the two points is no longer equal. Therefore, the treatment of m as a constant is not reasonable.