Analysis of Transient Transport and Entrapment of Particle in Continuous Casting Mold
Analysis of Transient Transport and Entrapment of Particle in Continuous Casting Mold
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DOI：
10.2355/isijinternational.54.2324
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发表时间：
2014-10
影响因子：
1.8
通讯作者：
Zhongqiu Liu;Baokuan Li;Li Zhang;Guodong Xu
中科院分区：
文献类型：
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作者：
Zhongqiu Liu;Baokuan Li;Li Zhang;Guodong Xu
建立了一个数学模型来模拟连铸结晶器内的瞬态湍流、凝固、颗粒的运移和夹带。采用大涡模拟（LES）方法计算了钢液池内的湍流。采用焓孔法模拟了钢的凝固过程。用拉普拉斯方程近似计算了固体区域的拉速。根据拉格朗日方法考虑了液池内粒子（气泡和非金属夹杂物）的输运。利用FLUENT软件的用户定义函数（UDF），考虑到粘滞区作用于颗粒的八种不同力的力平衡，建立了凝固锋中颗粒夹持的判据。预测的不对称流型与水模型实验结果进行了比较。预测了凝固壳中颗粒的捕获位置，并与轧制钢板超声探伤结果和前人对板坯中夹杂物分布的研究结果进行了比较。该模型成功地再现了许多已知现象和其他新的预测，包括瞬态不对称流动模式、液池内颗粒的瞬态不对称分布、瞬态夹带比和不同颗粒在凝固壳中的不对称位置。
A mathematical model has been developed to simulate the transient turbulent flow, solidification, transport and entrapment of particles in a continuous casting mold. The turbulence of molten steel inside the liquid pool is calculated using the large eddy simulation (LES). The enthalpy-porosity approach is used to simulate the solidification of steel. A Laplacian equation is used to approximate the pull velocity in the solid region. The transport of particle (bubble and non-metallic inclusion) inside the liquid pool is considered according to the Lagrangian approach. A criterion for particle entrapment in the solidified front is developed using the user-defined functions (UDF) of FLUENT software, considering force balance involving eight different forces acting on a particle at the mushy-zone. The predicted asymmetrical flow pattern is compared with the water model experiment results. The entrapped positions of particles in the solidified shell are predicted and compared with the ultrasonic flaw results of rolled steel plates and the previous study of inclusions distribution in slabs. The model has successfully reproduced many known phenomena and other new predictions, including the transient asymmetrical flow pattern, transient asymmetrical distribution of particles inside the liquid pool, transient entrapment ratios and asymmetrical positions of different particles in the solidified shell.