COUPLED TURBULENT-FLOW, HEAT, AND SOLUTE TRANSPORT IN CONTINUOUS-CASTING PROCESSES
COUPLED TURBULENT-FLOW, HEAT, AND SOLUTE TRANSPORT IN CONTINUOUS-CASTING PROCESSES
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DOI：
10.1007/bf02651719
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发表时间：
1995-08-01
影响因子：
3
通讯作者：
GUTHRIE, RIL
中科院分区：
文献类型：
--
作者：
ABOUTALEBI, MR;HASAN, M;GUTHRIE, RIL
建立了一个完全耦合的流动、传热和溶质运移模型，用于分析连铸方坯结晶器内的湍流流动、凝固和宏观偏析的演变。使用连续介质模型求解二元铁-碳合金系统的总质量、动量、能量和物质的传输方程，其中所述方程对铸件中的固体、液体和糊状区有效。采用低雷诺数kappa-kappa模型的修改版本，以纳入系统中的传输过程的湍流效应。一个基于控制体积的有限差分程序求解守恒方程与适当的边界条件。由于方程组的高度非线性，采用了一些技术来加速收敛过程。研究了拉速、钢种、水口结构等工艺参数对铸坯流动形态、凝固形貌和碳偏析的影响。根据计算得到的流型，计算出夹杂物颗粒的运动轨迹以及颗粒的密度分布。部分计算结果与已有的实验测量结果进行了比较，得到了合理的一致性。
A fully coupled fluid flow, heat, and solute transport model was developed to analyze turbulent flow, solidification, and evolution of macrosegregation in a continuous billet easter. Transport equations of total mass, momentum, energy, and species for a binary iron-carbon alloy system were solved using a continuum model, wherein the equations are valid for the solid, liquid, and mushy zones in the casting. A modified version of the low-Reynolds number kappa-epsilon model was adopted to incorporate turbulence effects on transport processes in the system. A control-volume-based finite-difference procedure was employed to solve the conservation equations associated with appropriate boundary conditions. Because of high nonlinearity in the system of equations, a number of techniques were used to accelerate the convergence process. The effects of the parameters such as casting speed, steel grade, nozzle configuration on flow pattern, solidification profile, and carbon segregation were investigated. From the computed flow pattern, the trajectory of inclusion particles, as well as the density distribution of the particles, was calculated. Some of the computed results were compared with available experimental measurements, and reasonable agreements were obtained.