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Numerical Investigation for Effects of Polydisperse Argon Bubbles on Molten Steel Flow and Liquid Slag Entrapment in a Slab Continuous Casting Mold

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Metallurgical and Materials Transactions B Aims and scope Submit manuscript

Abstract

An Eulerian–Eulerian multifluid model coupled with interfacial area transport equation (IATE) and volume of fluid (VOF) method is implemented to investigate the polydispersed bubbly flow and slag entrapment phenomena in a slab continuous casting mold. The multifluid model is employed to describe the molten steel, liquid slag, and argon gas three phases. The IATE is solved to compute the bubble coalescence and breakage, and the VOF method is used as a surface capturing technique to study interfacial behaviors among the phases at the onset of slag entrainment. The turbulence in the bulk region is modeled by WALE model with an extra source term for the interaction between the bubbles and the steel. The multifluid-IATE-VOF model is validated by previous experimental measurements, which can accurately predict the local bubble size distribution and slag entrapment in the continuous casting process. According to the comparison of the effect of monodisperse and polydisperse bubbles on the steel flow pattern and slag entrapment, it was found that small bubbles can coalesce into large bubbles in the dense bubble region. Bubble breakage often occurs in the jet stream region and in areas with few bubbles. Meanwhile, larger bubbles enhance the upward flow and significantly affect the liquid slag layer, which cause the formation of slag droplets near the SEN. Furthermore, as the gas flow rate increases, the influence of bubble coalescence becomes more pronounced, therefore, it is advisable to take bubble polydispersity into account for predicting the bubbly flow and slag entrapment during the CC process, especially in the case of high gas flow rates.

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Acknowledgments

The authors gratefully acknowledge financial support by the National Natural Science Foundation of China (U1960202).

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, P.R. China

    Lei Wang, Jian Yang & Yibo Liu

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  1. Lei Wang
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  2. Jian Yang
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  3. Yibo Liu
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Correspondence to Jian Yang.

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Wang, L., Yang, J. & Liu, Y. Numerical Investigation for Effects of Polydisperse Argon Bubbles on Molten Steel Flow and Liquid Slag Entrapment in a Slab Continuous Casting Mold. Metall Mater Trans B 53, 3707–3721 (2022). https://doi.org/10.1007/s11663-022-02634-y

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  • DOI: https://doi.org/10.1007/s11663-022-02634-y

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