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Open AccessArticle

The Peculiarities of Convective Heat Transfer in Melt of a Multiple-Electrode Arc Furnace

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State Educational Institution of the Higher Professional Education, Lugansk National University named after Vladimir Dahl, 92700 Lugansk city, Ukraine
2
State Educational Institution of the Higher Professional Education, Donetsk National University, 21000 Donetsk city, Ukraine
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(11), 1174; https://doi.org/10.3390/met9111174
Received: 10 October 2019 / Revised: 25 October 2019 / Accepted: 26 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Dedicating to Professor John Campbell's 80th Birthday)
The modern direction of improving the technology of steel production in high-power arc furnaces is the intensification of magnetohydrodynamic effects for mixing the melt. In this article, a furnace design is proposed that contains three roof arc and three bottom electrodes, which provides the formation of additional eddy currents in the melt when the furnace is supplied with direct current or a low-frequency current. For a numerical study of the features of heat transfer in the melt of this furnace, a three-dimensional mathematical model of magnetohydrodynamic and thermal processes was used. The results were processed using the methods of visualization of vortex structures and the Richardson criterion. In an oven with a capacity of 180 tons at currents in the electrodes of 80 kA, the conditions for the interaction of electric vortex and thermogravitational convection were studied. Results showed that thermogravitational convection due to nonuniform heating of the melt led to a decrease in the size of the main electric vortex flow and the formation of an additional flow near the side walls of the furnace. The features of azimuthal flows formed in the areas of electric arcs and hearth electrodes were analyzed. Results showed that the multivortex structure of the flows that formed in the furnace allowed the volume of stagnant zones to be reduced and provided acceptable melt mixing conditions. The results can be used to improve the energy and structural parameters of three-electrode arc furnaces. View Full-Text
Keywords: arc furnace; magnetic hydrodynamics; electric vortex flows; heat-gravitational convection arc furnace; magnetic hydrodynamics; electric vortex flows; heat-gravitational convection
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MDPI and ACS Style

Kukharev, A.; Bilousov, V.; Bilousov, E.; Bondarenko, V. The Peculiarities of Convective Heat Transfer in Melt of a Multiple-Electrode Arc Furnace. Metals 2019, 9, 1174.

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