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Evaluation of Slag Entrapment in Continuous Casting Mold Based on the LES-VOF-DPM Coupled Model

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Abstract

A transient three-dimensional mathematical model is developed to study the slag entrapment in a continuous-casting mold. The unsteady turbulent flow is computed using the large eddy simulation (LES). The sub-grid scale structure is modeled by Smagorinsky–Lilly model. The movements of discrete bubbles, as well as three continuous phases (air-slag-steel) are described by solving the coupled discrete particle model (DPM) and volume of fraction (VOF) model. Comparisons are made between the plant measurements and predicted result of level fluctuations near the submerged entry nozzle (SEN), and good agreements are obtained. Results reveal that the average velocity, transverse velocity of slag-metal interface are not accurate to evaluate the seriousness of slag entrapment in mold, because the surface velocity is also affected by bubble movements. By comparison, the variation trend of maximum velocity of slag-metal interface shows good agreements with that of the slag drops and therefore can be used to evaluate the slag entrapment in mold. Then considering interfacial tension force, mold size, impinging angle, port angle, impinging velocity and depth, a new dimensionless value of “J” is established to evaluate the seriousness of slag entrapment. Through comparing with traditional “F value”, the J value shows remarkable advantages in predicting slag entrapment in mold with different widths and volume flow rates of argon. The results are beneficial for controlling slag entrapment during continuous casting process.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51974071 and 51874203), Young Elite Scientists Sponsorship Program by CAST (No. 2018QNRC001), and Fundamental Research Funds for the Central Universities (No. N182505039).

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Authors and Affiliations

  1. Soochow University, Suzhou, 215137, People’s Republic of China

    Xianglong Li

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Baokuan Li, Zhongqiu Liu, Changjun Wang & Rongzheng Gao

  3. School of Iron and Steel, Soochow University, Suzhou, 215137, People’s Republic of China

    Deyong Wang, Tianpeng Qu & Shaoyan Hu

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  1. Xianglong Li
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  2. Baokuan Li
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  3. Zhongqiu Liu
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Correspondence to Baokuan Li or Tianpeng Qu.

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Manuscript submitted February 13, 2020; accepted June 5, 2021

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Li, X., Li, B., Liu, Z. et al. Evaluation of Slag Entrapment in Continuous Casting Mold Based on the LES-VOF-DPM Coupled Model. Metall Mater Trans B 52, 3246–3264 (2021). https://doi.org/10.1007/s11663-021-02253-z

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  • DOI: https://doi.org/10.1007/s11663-021-02253-z

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