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Effect of Temperature and Multichannel Stopper Rod on Bubbles in Water Model of a Steel Continuous Caster
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-16 , DOI: 10.1002/srin.202100067 Fenggang Liu 1, 2 , Haichen Zhou 1 , Lifeng Zhang 3 , Changyu Ren 1 , Ji Zhang 1 , Ying Ren 1 , Wei Chen 3
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-16 , DOI: 10.1002/srin.202100067 Fenggang Liu 1, 2 , Haichen Zhou 1 , Lifeng Zhang 3 , Changyu Ren 1 , Ji Zhang 1 , Ying Ren 1 , Wei Chen 3
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Herein, effects of the water temperature and a multichannel stopper rod with various gas hole diameters on the size and distribution of bubbles are investigated using a 0.5-scale water model of a steel slab continuous casting mold. The breakage ratio of bubbles increases with the increasing of the water temperature. The mean diameter of bubbles decreases from 2.11 to 1.32 mm with the water temperature increasing from 25 to 34 °C. The smaller dynamic viscosity and surface tension of the water at a higher temperature result in large turbulence velocity fluctuation at the bottom of the submerged entry nozzle. The effect of water temperature on the bubble size and distribution can hardly be ignored in the water model experiment. With the increase of the hole diameter of the gas channel (D
h) of the stopper rod, the number of bubbles first decreases to the minimum value at D
h = 1.5 mm and then increases, and bubble mean diameters increase, and the horizontal dispersion and penetration depth increase when the bubble diameter is larger than 1 mm. The multichannel stopper rod with the gas hole diameter of 1.5 mm is recommended under the current specific continuous casting condition.
中文翻译：
温度和多道塞棒对钢连铸机水模气泡的影响
在此，使用钢坯连铸结晶器的 0.5 比例水模型研究了水温和具有不同气孔直径的多通道塞棒对气泡大小和分布的影响。气泡的破裂率随着水温的升高而增加。随着水温从 25°C 升高到 34°C，气泡的平均直径从 2.11 毫米减小到 1.32 毫米。较高温度下水的动态粘度和表面张力较小，导致浸入式喷嘴底部湍流速度波动较大。在水模型实验中，水温对气泡大小和分布的影响是不可忽视的。随着气体通道孔径的增加（D h)，气泡数在D h = 1.5 mm 时先减少到最小值，然后增加，气泡平均直径增大，气泡直径大于 1 mm 时，水平分散度和穿透深度增大。在目前特定的连铸条件下，推荐使用气孔直径为1.5mm的多道塞棒。
更新日期：2021-04-16
中文翻译：
温度和多道塞棒对钢连铸机水模气泡的影响
在此，使用钢坯连铸结晶器的 0.5 比例水模型研究了水温和具有不同气孔直径的多通道塞棒对气泡大小和分布的影响。气泡的破裂率随着水温的升高而增加。随着水温从 25°C 升高到 34°C，气泡的平均直径从 2.11 毫米减小到 1.32 毫米。较高温度下水的动态粘度和表面张力较小，导致浸入式喷嘴底部湍流速度波动较大。在水模型实验中，水温对气泡大小和分布的影响是不可忽视的。随着气体通道孔径的增加（D h)，气泡数在D h = 1.5 mm 时先减少到最小值，然后增加，气泡平均直径增大，气泡直径大于 1 mm 时，水平分散度和穿透深度增大。在目前特定的连铸条件下，推荐使用气孔直径为1.5mm的多道塞棒。
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