Numerical Simulation of Laminar-Turbulent Transition in Magnetohydrodynamic Convection in an Electromagnetically Levitated Molten Droplet of Cu-Co Alloys Under a Static Magnetic Field

Eita Shoji, Koki Tanada, Ryuji Takahashi, Shosei Isogai, Rikuto Suzuki, Masaki Kubo, Takao Tsukada, Atsuki Komiya, Hiroyuki Fukuyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Direct numerical simulations were carried out to investigate three-dimensional, unsteady magnetohydrodynamic (MHD) convection in a spherical electromagnetically levitated molten Cu-Co droplet with a diameter of 5 mm under different strengths of the static magnetic field. The strength of the static magnetic field ranged from 0 to 3 T. MHD convection under lower static magnetic fields presented turbulent flow. The velocities in the levitated droplet decreased with increasing strength of the static magnetic field. At more than 1.5 T, the convective flow pattern became axisymmetric and the turbulent energy reached almost zero, i.e., MHD convection presented laminar flow. Comparisons of the present numerical results with past experimental results demonstrated that the marked change in phase separation structures in undercooled Cu-Co alloys at 1.0 to 1.5 T was closely related to the laminar-turbulent transition of MHD convection in the levitated droplet.

Original languageEnglish
Pages (from-to)896-902
Number of pages7
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume52
Issue number2
DOIs
Publication statusPublished - 2021 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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