Numerical modeling of electro-vortical flows in a confined volume

Kazak, Oleg; Semko, A. N.

doi:10.1007/s10891-012-0759-x

Cited by 14 publications

(9 citation statements)

References 5 publications

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“…A typical poloidal flow develops as it was often observed experimentally [47,[85][86][87][88][89]. Similar flow structures are very well known from vacuum arc remelting and electro-slag remelting [90][91][92][93][94][95][96][97]. However, depending on the exact geometry, the direction of the flow might be reversed [98][99][100][101].…”

Section: Resultsmentioning

confidence: 64%

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

Weber

Nimtz

Personnettaz

et al. 2018

Applied Thermal Engineering

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Liquid metal batteries (LMBs) were recently proposed as cheap large scale energy storage. Such devices are urgently required for balancing highly fluctuating renewable energy sources. During discharge, intermetallic phases tend to form in the cathode of LMBs. These do not only limit the up-scalability, but also the efficiency of the cells. Generating a mild fluid flow in the fully liquid cell will smoothen concentration gradients and minimise the formation of intermetallics.In this context we study electro-vortex flow numerically. We simulate a recent LMB related experiment and discuss how the feeding lines to the cell can be optimised to enhance mass transfer. The Lorentz forces have to overcome the stable thermal stratification in the cathode of the cell; we show that thermal effects may reduce electro-vortex flow velocities considerable. Finally, we study the influence of the Earth magnetic field on the flow.

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Section: Resultsmentioning

confidence: 64%

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

Weber

Nimtz

Personnettaz

et al. 2018

Applied Thermal Engineering

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“…The character of the liquid movement obtained in numerical modelling conforms to the general theoretical assumptions that are given in the physical statement of the problem and described in previous works. [1][2][3][4]6,15,16 According to the theory, when the current flows through the molten metal, a magnetic field is generated. The current conductor in the magnetic field is affected by the Lorenz force.…”

Section: Verification Of Obtained Resultsmentioning

confidence: 99%

Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Kazak

Semko

2013

Ironmaking & Steelmaking

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The article is devoted to the investigation of interaction between electrovortex and heat flows of liquid metal in dc arc furnaces with a bottom electrode. A mathematical model of liquid steel flows in a dc arc furnace with a bottom electrode was developed, and an algorithm of a three-stage solution was produced based on standard software packages. The results of electromagnetic, heat transfer and hydrodynamic analysis in industrial dc arc furnaces are given. It is shown that the Lorentz force makes up ,30% of the volumetric gravity force and makes the main contribution to vortex flow of liquid metal in a dc arc furnace. The convection flows with the maximum heat power of furnace make a significant contribution to the vortex flow of liquid metal, and the maximum value of the vortex flow velocity is ,1?5 times more than the movement without convection. The verification of results has been carried out by comparing them with general electrovortex flows theory, experimental data and results of similar software packages.

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“…1 b, we see that this model can also be considered as the top part of a liquid metal battery (LMB) [2], in which EVFs should be considered carefully, both as a possible danger for the integrity of the liquid electrolyte [3,4], as well as for their potentially positive role in enhancing mass transfer in the electrodes [5,6,7,8]. Besides its relevance for LMBs, EVF is a well-known phenomenon in quite a number of engineering devices such as DC and AC electric arc furnaces [9], induction furnaces [10], electric jet engines [11] or pumps [12] -for an extensive overview, see [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Electro-Vortex Flow in a Cylindrical Container

Liu¹,

Stefani²,

Weber³

et al. 2019

Preprint

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In a cylindrical container filled with an eutectic GaInSn alloy, an electro-vortex flow (EVF) is generated by the interaction of a non-uniform current with its own magnetic field. In this paper, we investigate the EVF phenomenon numerically and experimentally. Ultrasound Doppler Velocimetry (UDV) is applied to measure the velocity field in a cylindrical vessel. Second, we enhance an old numerical solver by taking into account the effect of Joule heating, and employ it for the numerical simulation of the EVF experiment. Special focus is laid on the role of the magnetic field, which is the combination of the current induced magnetic field and the external geomagnetic field. For getting a higher computational efficiency, the so-called parent-child mesh technique is applied in OpenFOAM when computing the electric potential, the current density and the temperature in the coupled solid-liquid conductor system. The results of the experiment are in good agreement with those of the simulation. This study may help to identify the factors that are essential for the EVF phenomenon, and for quantifying its role in liquid metal batteries.

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Numerical modeling of electro-vortical flows in a confined volume

Cited by 14 publications

References 5 publications

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Numerical and Experimental Investigation of Electro-Vortex Flow in a Cylindrical Container

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