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Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

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Abstract

The focus of the experimental and numerical study presented in this article is on the bulk flow within a swirling liquid metal column driven by a rotating magnetic field (RMF), whereas the free surface of the melt was covered by a distinct oxide layer. Flow measurements revealed an anomalous behavior of the flow: Pronounced oscillations of both the primary swirling and the secondary recirculating flow occur spontaneously. This peculiarity can be attributed to the influence of the oxide layer at the surface of the metal. The motion of the covering layer is governed by the strength of the fluid flow and the properties of the layer, and it might exhibit three different states of motion: permanent rotation, intermittent rotation, or the quiescent state. The regime of an intermittent oxide layer rotation reveals a striking influence on the bulk flow of the liquid metal. The amplitude of the velocity oscillations observed seems to be at least one order of magnitude larger than those of turbulent fluctuations in a steady RMF-driven flow. The essential features of the phenomenon observed were reproduced by a simple numerical model.

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Acknowledgments

The research is supported by the Deutsche Forschungsgemeinschaft (DFG) through the SFB 609 “Electromagnetic Flow Control in Metallurgy, Crystal Growth and Electrochemistry.” This support is acknowledged gratefully by the authors.

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Author notes

  1. Chaojie Zhang (PhD Student, Process Engineer)

    Present address: TGE Gas Engineering GmbH, Bonn, Germany

Authors and Affiliations

  1. MHD Department, Helmholtz-Zentrum Dresden-Rossendorf, D-01314, Dresden, Germany

    Chaojie Zhang (PhD Student, Process Engineer)

  2. Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany

    Victor Shatrov (Senior Researcher), Sven Eckert (Group Leader) & Gunter Gerbeth (Department Head)

  3. Applied Mathematics Research Centre, University of Coventry, Coventry, CV1SFB, U.K

    Janis Priede (Lecturer)

Authors
  1. Chaojie Zhang
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  2. Victor Shatrov
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  3. Janis Priede
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  4. Sven Eckert
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  5. Gunter Gerbeth
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Corresponding author

Correspondence to Sven Eckert.

Additional information

Manuscript submitted February 17, 2011.

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Zhang, C., Shatrov, V., Priede, J. et al. Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field. Metall Mater Trans B 42, 1188–1200 (2011). https://doi.org/10.1007/s11663-011-9538-x

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  • DOI: https://doi.org/10.1007/s11663-011-9538-x

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