Injecting gas into a ladle shroud to produce fine bubbles is an effective way to promote inclusion removal from molten steel in tundish. The flow and temperature fields in tundish with gas injection into ladle shroud have been investigated based on a k-ε model, Euler two-phase flow model and population balance model (PBM), and the relationships between the distribution of bubble diameter and the conditions of gas injection were investigated. The results indicate that gas injection into a ladle shroud significantly improves the flow and temperature fields in tundish. However, with the increase of gas flow rate, surface disturbance of the molten steel obviously increases. In addition, bubbles gather near the exit of shroud with the increase of gas flow rate, which is not conducive to the collision of bubbles and inclusions. Therefore, the gas flow rates of less than 15.13 m3/h are recommended.
Numerical simulation Tundish Fine bubble Population balance model
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