Modeling of molten metal flow in a continuous casting process considering the effects of argon gas injection and static magnetic-field application |
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Authors: | Baokuan Li Toshimitsu Okane Takateru Umeda |
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Affiliation: | (1) Department of Thermal Engineering, The School of Materials and Metallurgy, Northeastern University, 110006 Shenyang, P.R. China;(2) Department of Advanced Materials, Graduate School of Frontier Science, the University of Tokyo, 113-8656 Tokyo, Japan;(3) Department of Metallurgy, Graduate School of Engineering, the University of Tokyo, 113-8656 Tokyo, Japan |
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Abstract: | A mathematical model has been developed to analyze molten metal flow, considering the effects of argon gas injection and static
magnetic-field application in the continuous casting process. The k-ɛ turbulence model is used to calculate the turbulent variables. A homogeneous fluid model with variable density is employed
to tackle the molten metal-argon gas flow. The electromagnetic force is incorporated into the Navier-Stokes equation, and
the effects of boundary conditions of the magnetic field on the velocity distribution near the mold wall are included. A good
agreement between the numerically obtained flow-field results and measurements is obtained. The argon gas injection changes
the molten metal flow pattern, mainly in the upper portion of the mold. By applying the magnetic field, values of the averaged
velocity field in the bulk decrease significantly, and, especially at the top free surface, they become very small, which
can cause meniscus freezing. When magnetic-field application and argon gas injection are used together, the external flow
field out of the gas plume is significantly suppressed; nevertheless, flotation of gas bubbles is still active and is not
affected directly by the magnetic field. Although the penetrating length of the gas plume is shortened, the argon gas bubbles
in molten steel still cause fluctuation at the top free surface, which prevents the occurrence of freezing. |
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