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Effect of Static Magnetic Field on Recalescence and Surface Velocity Field in Electromagnetically Levitated Molten CuCo Droplet in Undercooled State

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Abstract

The recalescence events of phase-separated Co-rich phases in undercooled molten CuCo droplets electromagnetically levitated under various static magnetic fields were observed directly using a high-speed camera, and also the surface velocities on the levitated droplets were measured by tracing the trajectories of the phase-separated Co-rich phases as tracer particles. In addition, numerical simulations of melt convection in a spherical electromagnetically levitated CuCo droplet exposed to a static magnetic field were performed assuming laminar flow. We observed the emergence of many intermittent bright spots due to recalescence on the entire surface of the levitated droplet, and the frequency of the bright spots decreased markedly as the static magnetic field increased, with no bright spots observed at fields larger than 1.5 T. Also, the Reynolds numbers were evaluated from the measured and calculated velocities in the droplet for various static magnetic fields and compared with the critical Reynolds number of approximately 600, at which the laminar–turbulent transition of a magnetohydrodynamic (MHD) flow in an electromagnetically levitated droplet occurs, as proposed by Hyers et al. The above results clearly revealed that the marked change in the phase separation structures in undercooled molten CuCo droplets at approximately 1.5 T is due to a convective transition from turbulent flow to laminar flow in the levitated droplets, as speculated in our previous work.

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Acknowledgment

This work was supported by JSPS KAKENHI Grant Number 25289273.

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Authors and Affiliations

  1. Department of Chemical Engineering, Tohoku University, 6-6-07 Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Koki Tanada (Student), Shoya Ueno (Student), Masaki Kubo (Associate Professor) & Takao Tsukada (Professor)

  2. Department of Mechanical Systems Engineering, Toyama Prefectural University, Imizu, Toyama, 939-0398, Japan

    Ken-ichi Sugioka (Associate Professor)

  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Masahito Uchikoshi (Assistant Professor) & Hiroyuki Fukuyama (Professor)

  4. The Yokohama Rubber Co., Ltd., Tokyo, Japan

    Tsubasa Kitahara (Engineer)

Authors
  1. Tsubasa Kitahara
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  2. Koki Tanada
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  3. Shoya Ueno
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  4. Ken-ichi Sugioka
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  5. Masaki Kubo
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  6. Takao Tsukada
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  7. Masahito Uchikoshi
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  8. Hiroyuki Fukuyama
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Corresponding author

Correspondence to Takao Tsukada.

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Manuscript submitted June 19, 2015.

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Kitahara, T., Tanada, K., Ueno, S. et al. Effect of Static Magnetic Field on Recalescence and Surface Velocity Field in Electromagnetically Levitated Molten CuCo Droplet in Undercooled State. Metall Mater Trans B 46, 2706–2712 (2015). https://doi.org/10.1007/s11663-015-0441-8

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  • DOI: https://doi.org/10.1007/s11663-015-0441-8

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