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Visualization of Liquid Metal Two-phase Flows in a Physical Model of the Continuous Casting Process of Steel

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Abstract

We present an experimental study concerned with investigations of the two-phase flow in a mock-up of the continuous casting process of steel. A specific experimental facility was designed and constructed at HZDR for visualizing liquid metal two-phase flows in the mold and the submerged entry nozzle (SEN) by means of X-ray radioscopy. This setup operates with the low melting, eutectic alloy GaInSn as model liquid. The argon gas is injected through the tip of the stopper rod into the liquid metal flow. The system operates continuously under isothermal conditions. First results will be presented here revealing complex flow structures in the SEN widely differing from a homogeneously dispersed bubbly flow. The patterns are mainly dominated by large bubbles and large-area detachments of the liquid metal flow from the inner nozzle wall. Various flow regimes can be distinguished depending on the ratio between the liquid and the gas flow rate. Smaller gas bubbles are produced by strong shear flows near the nozzle ports. The small bubbles are entrained by the submerged jet and mainly entrapped by the lower circulation roll in the mold. Larger bubbles develop by coalescence and ascend toward the free surface.

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Acknowledgments

The authors from HZDR acknowledge the financial support from the German Helmholtz Association in the framework of the Helmholtz Alliance LIMTECH.

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Authors and Affiliations

  1. Department of Magnetohydrodynamics, Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstr. 400, 01328, Dresden, Germany

    Klaus Timmel (Ph.D. Student), Natalia Shevchenko (Research Assistant), Michael Röder (Assistant), Sven Eckert (Head of Department of Magnetohydrodynamics) & Gunter Gerbeth (Director of Institute of Fluid Dynamics)

  2. Industrial Operations Center, ArcelorMittal, Maizières Research S.A., 57283, Maizières-les-Metz, France

    Marc Anderhuber (Senior Research Engineer) & Pascal Gardin (Fluid Dynamics Expert)

Authors
  1. Klaus Timmel
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  2. Natalia Shevchenko
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  3. Michael Röder
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  4. Marc Anderhuber
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  5. Pascal Gardin
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  6. Sven Eckert
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  7. Gunter Gerbeth
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Corresponding author

Correspondence to Sven Eckert.

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Manuscript submitted September 17, 2014.

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Timmel, K., Shevchenko, N., Röder, M. et al. Visualization of Liquid Metal Two-phase Flows in a Physical Model of the Continuous Casting Process of Steel. Metall Mater Trans B 46, 700–710 (2015). https://doi.org/10.1007/s11663-014-0231-8

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  • DOI: https://doi.org/10.1007/s11663-014-0231-8

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