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首页> 外文期刊>ISIJ international >Water Model and CFD Studies of Bubble Dispersion and Inclusions Removal in Continuous Casting Mold of Steel
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Water Model and CFD Studies of Bubble Dispersion and Inclusions Removal in Continuous Casting Mold of Steel

机译：钢连铸结晶器中气泡扩散和夹杂物去除的水模型和CFD研究

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A water model study was undertaken to investigate bubble dispersion and inclusions removal by bubble adhesion in continuous casting mold. The water flow rate was varied in the range of 37-74 L/min, which is equivalent to 1.0-2.0 m/min of the casting speed in continuous casting process. The gas flow rate was varied in the range of 0-2.5 L/min. Silver coated hollow glass beads (SCHG) and plastic particles were used to imitate the inclusions and to investigate the effect of wettability, i.e., contact angle of the inclusions with liquid, on inclusion removal by bubble adhesion. Effect of gas and water flow rates on bubble dispersion in the mold was systematically determined. Inclusion removal at different gas and water flow rates was quantitatively determined. It was identified that the wettability of inclusions with liquid was a decisive factor in inclusion removal: with low wettability, i.e., high contact angle, removal efficiency increased with increasing gas and liquid flow rates, whereas removal efficiency was hardly affected by gas flow rate with high wettability, i.e., low contact angle. To interpret the results of the water model experiments, various computational fluid dynamics (CFD) models which had been reported were applied. None of them was able to represent the experimental results within an acceptable discrepancy. Two new CFD models, which employed a modified Reynolds number and force field theory around the bubble, were developed to simulate bubble dispersion and inclusion removal, respectively. The results indicated that these models could simulate bubbles dispersion and inclusion removal and showed reasonable agreement with results of water model in continuous casting mold.
机译：进行了水模型研究，以研究在连续铸造模具中通过气泡附着力消除气泡分散和夹杂物。水流量在37-74 L / min的范围内变化，相当于连续铸造过程中铸造速度的1.0-2.0 m / min。气体流速在0-2.5L / min的范围内变化。使用镀银的空心玻璃珠（SCHG）和塑料颗粒来模拟夹杂物，并研究润湿性，即夹杂物与液体的接触角，对通过气泡粘附去除夹杂物的影响。系统地确定了气体和水的流速对气泡在模具中分散的影响。定量确定了不同气体和水流速下的夹杂物去除率。已确定夹杂物与液体的润湿性是去除夹杂物的决定性因素：具有低润湿性，即高接触角，去除效率随气体和液体流速的增加而增加，而去除效率几乎不受气体流速的影响。高润湿性，即低接触角。为了解释水模型实验的结果，使用了已报道的各种计算流体动力学（CFD）模型。他们中没有一个能够在可接受的差异范围内表示实验结果。开发了两个新的CFD模型，分别采用修正的雷诺数和围绕气泡的力场理论，分别模拟气泡的分散和夹杂物的去除。结果表明，这些模型可以模拟气泡的分散和夹杂物去除，并且与连铸结晶器中水模型的结果显示出合理的一致性。

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