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Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath

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Abstract

The intensity of mixing in a molten metal bath stirred by bottom gas injection can be represented by the mixing time. According to previous water model experiments, the mixing time is known to be dependent on the operational variables such as the bath diameter, bath depth, location of a bottom nozzle, and gas flow rate. It is not easy to control the former three variables during processing, and the dependence of the mixing time on the gas flow rate is weak. In this study, the possibility of changing the mixing time drastically due to the control of the surface flow in the bath is examined. Three kinds of boundary conditions were imposed on the bath surface, and the relation between the fluid flow phenomena resulting from the surface flow control and the mixing time was investigated. The mixing time was found to be significantly influenced by the surface flow control. In particular, when the surface flow was suppressed by bringing a circular cylinder into contact with the bath surface, the mixing time became very long.

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Author notes

  1. Kei-Ichi Nakamura (Graduate Student)

    Present address: the Department of Mechanical Engineering, Osaka Institute of Technology, Junior College, 535-0002, Osaka, Japan

Authors and Affiliations

  1. the Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, 060-8628, Hokkaido, Japan

    Manabu Iguchi (Professor)

  2. the Department of Mechanical Engineering, Osaka Institute of Technology, Junior College, 535-0002, Osaka, Japan

    Ryoji Tsujino (Professor)

  3. Wakayama Works, Sumitomo Metal Industries Ltd., 640-8404, Wakayama, Japan

    Kei-Ichi Nakamura (Graduate Student)

  4. Department of Materials Science and Processing, Osaka University, 565-0871, Osaka, Japan

    Mitsuhiro Sano (Graduate Student)

Authors
  1. Manabu Iguchi
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  2. Ryoji Tsujino
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  3. Kei-Ichi Nakamura
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  4. Mitsuhiro Sano
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Iguchi, M., Tsujino, R., Nakamura, KI. et al. Effects of surface flow control on fluid flow phenomena and mixing time in a bottom blown bath. Metall Mater Trans B 30, 631–637 (1999). https://doi.org/10.1007/s11663-999-0024-7

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  • DOI: https://doi.org/10.1007/s11663-999-0024-7

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