Numerical Analysis of Nitrogen Absorption Rate Accompanied with Marangoni Convection in the Molten Iron under Non-inductive Stirring Condition

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著者

    • JUN Zhu
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
    • SHI Feng
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
    • MUKAI Kusuhiro
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
    • TSUKAMOTO Hiroshi
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology

抄録

Numerical analysis was carried out to investigate nitrogen absorption rate accompanied with Marangoni convection due to surface tension gradient on the free surface of liquid iron by using the commercial CFD software package. Good agreements between the experimental values and the calculated results were attained with various oxygen contents. It could be deduced that the Marangoni convection occurred continuously until the liquid iron is saturated with nitrogen, since the gradient of the nitrogen concentration could be maintained on the free surface of liquid iron owing to flow of the liquid iron. The decrease in nitrogen absorption rate with increasing oxygen content under non-inductive stirring condition could be attributed to the dwindling of convection in liquid iron and the effective diffusion coefficient as the liquid iron flow changes from the turbulent to the laminar flow.

収録刊行物

  • ISIJ international  

    ISIJ international 39(5), 409-418, 1999-05-15 

    The Iron and Steel Institute of Japan

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