Generation of a Reversed-Field Configuration without an Applied Magnetic Field

1978 ◽  
Vol 41 (12) ◽  
pp. 798-801 ◽  
Author(s):  
J. D. Sethian ◽  
K. A. Gerber ◽  
D. N. Spector ◽  
A. E. Robson
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Field Configuration ◽  
Reversed Field

The resistive evolution of force-free magnetic fields. Part 3. Cylindrical geometry

1979 ◽  
Vol 22 (2) ◽  
pp. 193-200 ◽  
Author(s):  
J. Reid ◽  
E. W. Laing
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Electric Fields ◽  
Field Configuration ◽  
Cylindrical Geometry ◽  
Adiabatic Evolution ◽  
Final State ◽  
Cylindrically Symmetric ◽  
Reversed Field

Equations describing the resistive evolution of a cylindrically symmetric magnetic field through force-free states enable us to study its response to externally applied electric fields. The process is relaxational, and, under certain conditions, the final state is a reversed field configuration. We show, moreover, that the non-standard nature of the equations leads to a non-trivial (adiabatic) evolution in the case of vanishing resistivity.

Spontaneous generation of magnetic field in an imploding plasma

1984 ◽  
Vol 32 (3) ◽  
pp. 349-357 ◽  
Author(s):  
S. K. H. Auluck
Keyword(s):  
Magnetic Field ◽  
Axial Magnetic Field ◽  
Equations Of Motion ◽  
Field Configuration ◽  
Spontaneous Generation ◽  
Centripetal Acceleration ◽  
Cylindrically Symmetric ◽  
Order Of Magnitude ◽  
Reversed Field ◽  
Metallic Liner

Spontaneous generation of an axial magnetic field is predicted when the usually neglected centripetal acceleration term is properly taken into account in the two-fluid equations of motion for a cylindrically symmetric imploding plasma. An order-of-magnitude calculation is presented to illustrate spontaneous generation of a reversed-field configuration in a plasma imploded by a metallic liner.

scholarly journals Generation of Reverse Meniscus Flow by Applying An Electromagnetic Brake

2021 ◽  
Author(s):  
Alexander Vakhrushev ◽  
Abdellah Kharicha ◽  
Ebrahim Karimi-Sibaki ◽  
Menghuai Wu ◽  
Andreas Ludwig ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Lorentz Force ◽  
Applied Magnetic Field ◽  
Numerical Study ◽  
Flow Direction ◽  
Experimental Studies ◽  
Submerged Entry Nozzle ◽  
Mean Flow ◽  
Slab Caster ◽  
The Mean

AbstractA numerical study is presented that deals with the flow in the mold of a continuous slab caster under the influence of a DC magnetic field (electromagnetic brakes (EMBrs)). The arrangement and geometry investigated here is based on a series of previous experimental studies carried out at the mini-LIMMCAST facility at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The magnetic field models a ruler-type EMBr and is installed in the region of the ports of the submerged entry nozzle (SEN). The current article considers magnet field strengths up to 441 mT, corresponding to a Hartmann number of about 600, and takes the electrical conductivity of the solidified shell into account. The numerical model of the turbulent flow under the applied magnetic field is implemented using the open-source CFD package OpenFOAM®. Our numerical results reveal that a growing magnitude of the applied magnetic field may cause a reversal of the flow direction at the meniscus surface, which is related the formation of a “multiroll” flow pattern in the mold. This phenomenon can be explained as a classical magnetohydrodynamics (MHD) effect: (1) the closure of the induced electric current results not primarily in a braking Lorentz force inside the jet but in an acceleration in regions of previously weak velocities, which initiates the formation of an opposite vortex (OV) close to the mean jet; (2) this vortex develops in size at the expense of the main vortex until it reaches the meniscus surface, where it becomes clearly visible. We also show that an acceleration of the meniscus flow must be expected when the applied magnetic field is smaller than a critical value. This acceleration is due to the transfer of kinetic energy from smaller turbulent structures into the mean flow. A further increase in the EMBr intensity leads to the expected damping of the mean flow and, consequently, to a reduction in the size of the upper roll. These investigations show that the Lorentz force cannot be reduced to a simple damping effect; depending on the field strength, its action is found to be topologically complex.

scholarly journals Stability of nonaxisymmetric ferrofluid flow in rotating cylinders with magnetic field

2005 ◽  
Vol 2005 (23) ◽  
pp. 3727-3737 ◽  
Author(s):  
Jitender Singh ◽  
Renu Bajaj
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Critical Value ◽  
Annular Space ◽  
Rotating Cylinders ◽  
The Stability

Effect of an axially applied magnetic field on the stability of a ferrofluid flow in an annular space between two coaxially rotating cylinders with nonaxisymmetric disturbances has been investigated numerically. The critical value of the ratioΩ∗of angular speeds of the two cylinders, at the onset of the first nonaxisymmetric mode of disturbance, has been observed to be affected by the applied magnetic field.

scholarly journals Phase boundary dynamics of bubble flow in a thick liquid metal layer under an applied magnetic field

2020 ◽  
Vol 5 (6) ◽  
Author(s):  
Mihails Birjukovs ◽  
Valters Dzelme ◽  
Andris Jakovics ◽  
Knud Thomsen ◽  
Pavel Trtik
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Phase Boundary ◽  
Applied Magnetic Field ◽  
Metal Layer ◽  
Bubble Flow ◽  
Boundary Dynamics
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