TY - JOUR

T1 - Melt flow patterns in metallurgical MHD devices with combined inductive and conductive power supply

AU - Pavlovs, S.

AU - Jakovičs, A.

AU - Baake, E.

AU - Nacke, B.

PY - 2014

Y1 - 2014

N2 - The paper presents a numerical study of metallurgical magnetohydrodynamic (MHD) devices with combined power supply: i) inductive by an alternating current (AC) coil; ii) conductive through electrodes with AC or direct current (DC). Peculiarities of the Lorentz force computations are discussed for the following cases: i) the interaction of inductive or conductive currents with their self magnetic fields; ii) the cross effect of the interaction between the current and the magnetic field produced by different sources; iii) the phase shift between inductive and conductive currents. The developed 3D models for computations of electromagnetic (EM) and hydrodynamic (HD) fields are presented for the ladle furnace (LF) with an EM stirrer. A three-phase conductive current is supplied to electrodes submerged into the melt. An inductive current is supplied by a side non-symmetrical inductor, which is the source of a travelling magnetic field. Melt flow patterns are obtained also for an axisymmetric MHD device. The conductive single phase AC supplied to the top electrode submerged into the melt and to the bottom electrode is the source of electro-vortex convection (EVC). The inductive single phase AC supplied by an almost cylindrical coil (each winding has a thin gap) placed around the melt is the source of EM convection (EMC). Melt circulation is the results of the competition between EVC and EMC. MHD rotation appears due to the cross effect of the current-magnetic field interaction produced by different sources. The melt flow is computed by a 3D transient Shear Stress Transport ( SST) model of turbulence. Several estimations have been performed with a quasi-laminar model; the chosen effective turbulent viscosity is constant.

AB - The paper presents a numerical study of metallurgical magnetohydrodynamic (MHD) devices with combined power supply: i) inductive by an alternating current (AC) coil; ii) conductive through electrodes with AC or direct current (DC). Peculiarities of the Lorentz force computations are discussed for the following cases: i) the interaction of inductive or conductive currents with their self magnetic fields; ii) the cross effect of the interaction between the current and the magnetic field produced by different sources; iii) the phase shift between inductive and conductive currents. The developed 3D models for computations of electromagnetic (EM) and hydrodynamic (HD) fields are presented for the ladle furnace (LF) with an EM stirrer. A three-phase conductive current is supplied to electrodes submerged into the melt. An inductive current is supplied by a side non-symmetrical inductor, which is the source of a travelling magnetic field. Melt flow patterns are obtained also for an axisymmetric MHD device. The conductive single phase AC supplied to the top electrode submerged into the melt and to the bottom electrode is the source of electro-vortex convection (EVC). The inductive single phase AC supplied by an almost cylindrical coil (each winding has a thin gap) placed around the melt is the source of EM convection (EMC). Melt circulation is the results of the competition between EVC and EMC. MHD rotation appears due to the cross effect of the current-magnetic field interaction produced by different sources. The melt flow is computed by a 3D transient Shear Stress Transport ( SST) model of turbulence. Several estimations have been performed with a quasi-laminar model; the chosen effective turbulent viscosity is constant.

UR - http://www.scopus.com/inward/record.url?scp=84928317790&partnerID=8YFLogxK

U2 - 10.22364/mhd.50.3.8

DO - 10.22364/mhd.50.3.8

M3 - Article

AN - SCOPUS:84928317790

VL - 50

SP - 303

EP - 315

JO - Magnetohydrodynamics

JF - Magnetohydrodynamics

SN - 0024-998X

IS - 3

ER -