Theory of Movement Behavior of Argon Bubbles in Upper Nozzle of Tundish During Argon Blowing Process

作者：Li, Yang^*; Cheng, Changgui; Liu, Jiangao; Wu, Weili; Chen, Deli

来源：Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science , 2023.

DOI：10.1007/s11663-023-02938-7

• SUBMERGED ENTRY NOZZLE
• SIMULATION
• FLOW
• MOLD
• GAS
• IMPROVEMENT
• INJECTION
• SURFACE
• STEEL

The prevention of nozzle clogging in the tundish upper nozzle through argon blowing has been commonly practiced. However, there is still a lack of understanding regarding the specific factors and mechanisms that influence the formation of the argon film. In this paper, the movement behavior of argon bubbles in upper nozzle of tundish during argon blowing process was studied. Results indicate that the movement behavior of argon bubbles is influenced by several factors, such as pore diameter, volume flow rate of the fluid, argon blowing rate, and number of effective pores. It was observed that the departure radius of the bubble increases with a lower pore position and a larger pore diameter in a given upper nozzle. Additionally, the departure time of the bubble increases with a lower pore position, a lower argon blowing rate, a larger pore diameter, and a larger number of effective pores. Moreover, the movement time of the bubble increases with a lower pore position, a smaller volume flow rate of the fluid, and a larger pore diameter. Under specific process parameters, the distribution of bubbles in the upper nozzle appears as bubble chains. For actual continuous casting production, it is recommended to consider using smaller pore diameters and layered permeable bricks, as this can serve as a theoretical and technological basis for optimizing argon blowing parameters and permeable brick design.

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