Fluid dynamics in bubble stirred ladles: Part I. experiments |
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| Authors: | S T Johansen D G C Robertson K Woje and T A Engh |
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| Affiliation: | (1) Division of Metallurgy, SINTEF, N-7034 Trondheim, NTH, Norway;(2) Department of Metallurgical Engineering, University of Missouri—Rolla, Foulton Hall, 65401-0249 Rolla, MO;(3) Engineer with S?rco Engineering A/S, Alsteinsgt. 7, P.B. 618, N-4001 Stavanger, Norway;(4) Department of Metallurgy, Technical University of Trondheim, N-7034 Trondheim, NTH, Norway |
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| Abstract: | Air is supplied through a porous plug placed in the center axis of a cylindrical perspex-water model of a ladle. A Laser-Doppler
system is employed to measure radial and axial mean and fluctuating velocities. Velocities in the two-phase bubbly region
can also be determined. Velocities are measured near the bottom, half-way up, and near the free surface. It is shown that
the bubbles contribute to production of turbulence. The ladle has recirculation zones near the bottom, where the mean velocities
are very low. Close to the free surface the radial mean and turbulent velocities are high, promoting mass transfer through
the interface. The present measured velocity profiles cannot be reduced to a single profile by employing similarity scaling.
Formerly a Visiting Scientist at SINTEF
Formerly Engineer at SINTEF |
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