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Numerical simulation of Marangoni effect induced by species transfer across iron droplet–molten slag interface

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Abstract

A mathematical model accounting for unsteady mass transfer across interface of a stationary iron droplet immersed into molten slag was established through the volume of fluid coupled with level set method. The Marangoni effect induced by mass transfer was reproduced successfully, and the hydrodynamic instability phenomena at the interface, such as the Marangoni convection flow, the evolution of the interfacial tension during the mass transfer, and the influence of Marangoni effect on the mass transfer rate, were revealed. The results show that the Marangoni convection flow develops quickly and behaves as an ordered structure in the forms of four pairs of the convection cell at the edge of the droplet once the oxygen transfer across the interface starts. The average convection flow velocity along the interface is high, even more than 0.025 m/s, depending on the droplet diameter, which facilitates the mass transfer. The Marangoni convection flow of the large droplet develops more easily than that of the small droplet, and the larger the droplet diameter is, the higher the convection flow velocity and the mass transfer rate are. Moreover, it is shown that the droplet diameter influences the impacting region of the Marangoni convection flow and its duration period.

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Acknowledgements

This work is funded by the National Natural Science Foundation of China (No. 51904062), the Fundamental Research Funds of the Central Universities of China (No. N2225021), and the Doctoral Scientific Research Foundation of Liaoning Institute of Science and Technology (No. 2107B04).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, Liaoning, China

    Ming-ming Li, Zhen-qiang Wu & Zong-shu Zou

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Ming-ming Li, Zhen-qiang Wu & Zong-shu Zou

  3. School of Metallurgical Engineering, Liaoning Institute of Science and Technology, Benxi, 117004, Liaoning, China

    Lin Li

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  1. Ming-ming Li
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Li, Mm., Wu, Zq., Li, L. et al. Numerical simulation of Marangoni effect induced by species transfer across iron droplet–molten slag interface. J. Iron Steel Res. Int. 30, 1109–1116 (2023). https://doi.org/10.1007/s42243-023-00977-7

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  • DOI: https://doi.org/10.1007/s42243-023-00977-7

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