Evolution of melt convection in a liquid metal driven by a pulsed electric current

doi:10.1088/1674-1056/ac0a6c

Abstract Gain refinement in metal alloy can be achieved by applying an electric current pulse (ECP) in solidification process. Forced flow inside the melt has been proved to be a key role in grain refinement. In this paper, the fluid flow inside Ga 20 wt%-In 12 wt%-Sn alloy induced by a damping sinusoidal ECP flowing through two parallel electrodes into the cylindrical melt was investigated by both experimental measurements and numerical simulations. Experimental results showed that a strong descending jet was induced beneath the bottom of electrodes under the application of ECP. Besides, it was found that flow intensity increases with the increase of amplitude, frequency, and pulse width, respectively. In order to unlock the formation mechanism of flow pattern and the relevance of flow intensity varied with electrical parameters, a three-dimensional numerical model under the application of ECP was established. Meanwhile, a comparative study was conducted by numerical simulations to reveal the distributions of electromagnetic fields and forced flow. Numerical results showed that the downward Lorentz force induced by ECP was concentrated beneath the bottom of electrodes. This downward Lorentz force induces a descending jet and provokes a global forced flow. According to numerical simulations, the evolution of flow intensity with electrical parameters under the application of ECP can be understood by the time averaged impulse of Lorentz force.

Keywords: pulsed electric current flow measurement numerical simulation magnetohydrodynamics

Received: 27 April 2021
Revised: 09 June 2021
Accepted manuscript online: 11 June 2021

PACS:	47.65.-d	(Magnetohydrodynamics and electrohydrodynamics)
	47.80.Cb	(Velocity measurements)
	47.27.em	(Eddy-viscosity closures; Reynolds stress modeling)
	47.11.Fg	(Finite element methods)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1760204, 51974183, 52071194, and 52074180).

Corresponding Authors: Yunhu Zhang
E-mail: zhangyunhu.zyh@163.com

Cite this article:

Yanyi Xu(徐燕祎), Yunhu Zhang(张云虎), Tianqing Zheng(郑天晴), Yongyong Gong(龚永勇), Changjiang Song(宋长江), Hongxing Zheng(郑红星), and Qijie Zhai(翟启杰) Evolution of melt convection in a liquid metal driven by a pulsed electric current 2021 Chin. Phys. B 30 084701

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Evolution of melt convection in a liquid metal driven by a pulsed electric current

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