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首页> 外文期刊>High temperature materials and processes >Mathematical Modeling of Liquid Slag Layer Fluctuation and Slag Droplets Entrainment in a Continuous Casting Mold Based on VOF-LES Method
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Mathematical Modeling of Liquid Slag Layer Fluctuation and Slag Droplets Entrainment in a Continuous Casting Mold Based on VOF-LES Method

机译：基于VOF-LES法的连铸结晶器内液渣层起伏和夹带液滴数学模型

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The slag behaviors, directly relating with the qualities of the final cast products, are influenced by the transient surface flow of liquid steel in a continuous casting mold. A one-half scale model is used to investigate the slag behaviors and their droplets entrainment. The model based on Volume of Fluid (VOF) multiphase coupled with Large Eddy Simulation (LES) is established to further illuminate the phenomena of the liquid oil layer fluctuation, the slag “eye” regions, and the slag entrainment observed in water experiment. The effects of casting speeds on the slag behaviors and their entrained droplets are investigated. The results show that the fluctuation of the oil layer is influenced by the transient flow. The calculations for the oil layer profile, the accumulation, and protrusions of oil layer are consistent with the water experiment. The asymmetry of the slag “eye” regions is also influenced by the asymmetry of free surface and transient turbulent flow. The “eye” regions near the narrow wall show distinct asymmetric change at different casting speeds. At a lower casting speed, the slag “eye” regions change irregularly and display the alternate process of open and collapse at the two sides of the narrow walls of the model. While at a relative higher casting speed, the slag layer gathers toward the nozzle, and the slag “eye” regions gradually grow and always open. The simulation model can reveal that the mechanism of the slag entrainment includes two main modes: the cutting or dragging mode and shear layer instability. The average diameter and amount of the entrained droplets are calculated through the UDF codes of ANSYS FLUENT software, and the size distribution of the entrained droplets is also counted. When the casting speed is lower, the dominant diameters of the entrained droplets range between 2 and 3?mm. With casting speed increase, the distribution of the droplets becomes wider, and there is a gradually increase in the percentage of larger droplets with a size of 4–6?mm.
机译：渣的行为直接关系到最终铸造产品的质量，其受连续铸模中液态钢的瞬时表面流影响。半比例模型用于研究炉渣的行为及其夹带的液滴。建立了基于流体体积（VOF）多相结合大涡模拟（LES）的模型，以进一步阐明液态油层起伏现象，炉渣“眼”区域和水实验中观察到的炉渣夹带现象。研究了铸造速度对熔渣行为及其夹带液滴的影响。结果表明，油层的波动受瞬态流动的影响。油层轮廓，油层堆积和凸起的计算与水实验一致。炉渣“眼”区域的不对称性还受到自由表面和瞬态湍流的不对称性的影响。窄壁附近的“眼”区域在不同的铸造速度下表现出明显的不对称变化。在较低的铸造速度下，炉渣“眼”区域会不规则地变化，并在模型的窄壁的两侧显示出交替的打开和塌陷过程。在较高的铸造速度下，炉渣层向喷嘴聚集，炉渣“眼”区域逐渐长大并始终打开。仿真模型表明，夹渣的机理主要包括两种模式：切割或拖动模式和剪切层失稳。通过ANSYS FLUENT软件的UDF代码计算夹带的液滴的平均直径和数量，并计算夹带的液滴的尺寸分布。当流延速度较低时，夹带的液滴的主要直径在2至3μmm之间。随着浇铸速度的增加，液滴的分布变宽，尺寸为4–6？mm的较大液滴的百分比逐渐增加。

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