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최성조,윤종규,박병관 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.4
A mathematical model of a fluid flow in a bottom blown gas-stirred vessel which is widely used in refining process of steel has been developed with the use of Homogeneous Flow Theory corrected by Drift Flux Model. Time-averaged continuity equation, Navier-Stokes equation and K-εturbulence model are applied to the two-dimensional axisymmetric turbulent recirculating flow in a cylindrical vessel and mean velocity distributions, turbulent kinetic energy distributions are computed by Finite Difference Method. The computed results of the velocity distributions are reasonably well agreed with the experimental data of investigators and those of turbulent kinetic energy show semi-quantitative agreements. This numerical experiments show that the fluid flow field in gas-stirred vessel is highly non-uniform and that velocity and turbulent kinetic energy show relatively higher values near free surface and plume zone than the bottom regions of vessel which has very lower values.
최성조,윤종규 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.4
Through the application of mathematical modelling and water model experiments, a reasonable understanding has been obtained of flow pattern and mixing characteristics in ladle injection metallurgy. It is seen that the flow pattern in gas-stirred cylindrical vessel produces a recirculating vortex located high in the vessel and displaced toward the side wall. Stagnant zone is existing especially at the bottom of the vessel and increased as the H/D ratio is decreased. Mixing time of gas-stirred system is measured by means of a conductivity method. It was found that the time required for the homogenization of the tracer could be readily correlated with the rate of disspiation energy or Froude number. Mixing time also depends on geometry of a vessel. As the H/D ratio of a vessel is decreased, the mixing time is increased. The increase of mixing time in case of low H/D ratio is considered to be the increase of stagnant zone in bottom region.