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Bubble behavior in the slab continuous casting mold: Physical and mathematical model
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.jmrt.2020.02.099
Paulo Luiz Santos , Johne Jesus Mol Peixoto , Carlos Antônio da Silva , Itavahn Alves da Silva , Clenice Moreira Galinari

A two phase population balance is used to predict the polydispersed bubble flow and size distribution in a slab continuous casting mold and Submerged Entry Nozzle (SEN) system. Multiple Size Group (MUSIG) with a suitable breakage and coalescence model (Ansys CFX) was adopted to account for the polydispersed gas flow. Initial bubble size distribution as determined for two industrial refractories have been taken in consideration. A two way coupling model including the effect of the drag force and non-drag forces such as virtual mass force and turbulent dispersion force was considered. The results are compared with gas distribution in a 1:1 scale water — air mold model running under conditions of fluidynamic similarity to validate the model. The simulations have then been extended to describe the actual steel — argon flow, considering a thermal expansion factor for argon bubbles. The effect of gas distribution on the flow field of liquid inside the mold and other metallurgical aspects are discussed.



中文翻译:

板坯连铸结晶器中的气泡行为:物理和数学模型

使用两相人口平衡来预测板坯连铸结晶器和浸入式注口(SEN)系统中的多分散气泡流量和尺寸分布。采用具有合适的破裂和合并模型(Ansys CFX)的多尺寸组(MUSIG)来解释多分散气流。已经考虑了针对两种工业耐火材料确定的初始气泡尺寸分布。考虑了包括阻力和非阻力(例如虚拟质量力和湍流分散力)影响的双向耦合模型。将结果与在流体动力学相似条件下运行的1:1比例水-空气模具模型中的气体分布进行比较,以验证模型。然后扩展了模拟以描述实际的钢-氩气流量,考虑氩气气泡的热膨胀系数。讨论了气体分布对模具内液体流场和其他冶金方面的影响。

更新日期:2020-03-21
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