Stirring flow of liquid metal generating by low-frequency modulated traveling magnetic field in rectangular cell

G Losev,A Pavlinov,E Shvydkiy,I Kolesnichenko,I Sokolov

doi:10.1088/1757-899x/581/1/012005

Abstract

In the present work the influence of low frequency modulation of a travelling magnetic field (TMF) on a process of generation of electro-vortex flows in electrically conducting media are numerically and experimentally investigated. The measurements are carried out on a low melting temperature GaZnSn alloy by means of Ultrasonic Doppler Velocimetry. For numerical simulation, Comsol Multiphysics software was used. The dependencies of average and pulsating Reynolds numbers on the magnitude of electromagnetic impact and two modes of low frequency modulation are considered. A positive influence of reversed TMF modulations on the stirring process is determined. In particular the formation of a small-scale vortex structure in the main volume of liquid media.

Highlights

The metal production and development of alloys with specific properties is one of the great challenges of modern metallurgy
In the present work the influence of low frequency modulation of a travelling magnetic field (TMF) on a process of generation of electro-vortex flows in electrically conducting media are numerically and experimentally investigated
The velocity characteristics were the main criterion for determining the quality of the mixing of the liquid metal

Summary

Introduction

The metal production and development of alloys with specific properties is one of the great challenges of modern metallurgy. Thereby, the contactless generation and control of flows is applicable in the field of non-ferrous and ferrous metals preparation. In the conductive medium the alternating magnetic field excite eddy currents. The interaction of these currents with the initial magnetic field leads to the generation of an electromagnetic force. In the case of liquid medium, the force generates vortex flows. Such flows increase the intensity of heat transfer and exchange in the melts [4], smooth the crystallization front [5] and increase the energy efficiency of operations [6]. Electromagnetic stirring by rotating and travelling magnetic fields (TMF) during the crystallization of ingots is widely used [7]

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