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Thermal convective instability in a micropolar ferromagnetic fluid saturated porous layer heated from below

C. E. Nanjundappa1 - R. Nataraj2

1 Department of Mathematics, Dr. Ambedkar Institute of Technology, Bangalore-560 056, India
2 Department of Mathematics, Don Bosco Institute of Technology, Bangalore-560 074, India

Abstract
The onset of ferromagnetic convection in a micropolar ferromagnetic fluid saturated porous layer heated from below in the presence of a uniform applied vertical magnetic field has been investigated. The rigid-isothermal boundaries of the fluid layer are considered to be ferromagnetic and the eigenvalue problem is solved numerically using the Galerkin method. It is noted that the paramagnetic boundaries with large magnetic susceptibility χ mainly delay the onset of ferromagnetic convection if compared to a very low magnetic susceptibility as well as to ferromagnetic boundaries. The increase in value of the magnetic parameter M1 and spin diffusion (couple stress) parameter N3 is to hasten, while the increase in value of the coupling parameter N1 and micropolar heat conduction parameter N5 is to delay the onset of ferromagnetic convection. Tables 1, Figs 5, Refs 13.

Magnetohydrodynamics 49, No. 3/4, 454-460, 2013 [PDF, 0.21 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X
DOI: http://doi.org/10.22364/mhd