Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Regular Article
Numerical Study of Oscillating Melt Flows and Its Solute Transport Driven by Electromagnetic Force around Dendrite
Kazuyuki UenoYukinobu NatsumeShin-ichi ShimasakiKazuhiko IwaiKenichi Ohsasa
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2016 Volume 102 Issue 3 Pages 141-150

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Abstract

Numerical simulations of oscillating flows of molten metal were carried out. These flows were driven by electromagnetic force under imposition of static magnetic field and alternating electric field. Solute transport around a dendrite was calculated simultaneously with the flow field. Results of simulations clarify effects of the electromagnetic oscillating flows on the solute transport when solute condensation occurs in liquid phase around the dendrite. Boundary layer of the oscillating flow is similar to Stokes layer. In the vicinity of the tip of the primary arm (or the tertiary arm), a vortex is generated from this shear layer every half period. These vortices blow up the solute and hence solute transport is enhanced. Simulation results of various conditions suggests the optimum Womersley number exists while the primary-arm Reynolds number is required to be much greater than one. Five times enhancement of solute transport is obtained in a typical case where Womersley number is 8.6 and the primary-arm Reynolds number is 14.

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© 2016 The Iron and Steel Institute of Japan

This article is licensed under a Creative Commons [Attribution-NonCommercial-NoDerivatives 4.0 International] license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
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