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Resistive and ferritic-wall plasma dynamos in a sphere.
- Source :
- Physics of Plasmas; Oct2012, Vol. 19 Issue 10, p104501, 4p
- Publication Year :
- 2012
-
Abstract
- We numerically study the effects of varying electric conductivity and magnetic permeability of the bounding wall on a kinematic dynamo in a sphere for parameters relevant to Madison plasma dynamo experiment. The dynamo is excited by a laminar, axisymmetric flow of von Kármán type. The flow is obtained as a solution to the Navier-Stokes equation for an isothermal fluid with a velocity profile specified at the sphere's boundary. The properties of the wall are taken into account as thin-wall boundary conditions imposed on the magnetic field. It is found that an increase in the permeability of the wall reduces the critical magnetic Reynolds number Rm<subscript>cr</subscript>. An increase in the conductivity of the wall leaves Rm<subscript>cr</subscript> unaffected but reduces the dynamo growth rate. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1070664X
- Volume :
- 19
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Physics of Plasmas
- Publication Type :
- Academic Journal
- Accession number :
- 82964061
- Full Text :
- https://doi.org/10.1063/1.4757219