Effect of rotation on a layer of micropolar ferromagnetic fluid heated from below saturating a porous medium

被引:19
作者
Sunil [1 ]
Sharma, Anu
Bharti, Pavan Kumar
Shandil, R. G.
机构
[1] Natl Inst Technol, Dept Appl Sci, Hamirpur 177005, India
[2] Himachal Pradesh Univ, Dept Math, Shimla 171005, Himachal Prades, India
关键词
D O I
10.1016/j.ijengsci.2006.05.003
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper deals with the theoretical investigation of the effect of rotation on a layer of micropolar ferromagnetic fluid heated from below saturating a porous medium subjected to a transverse uniform magnetic field. For a flat fluid layer contained between two free boundaries, an exact solution is obtained using a linear stability analysis theory and normal mode analysis method. For the case of stationary convection, the effect of various parameters like medium permeability, rotation, non-buoyancy magnetization, coupling parameter, spin diffusion parameter and micropolar heat conduction has been analyzed. The critical magnetic thermal Rayleigh number for the onset of instability are also determined numerically for sufficiently large values of magnetic parameter M-1 and results are depicted graphically. The principle of exchange of stabilities is found to hold true for the micropolar ferromagnetic fluid saturating a porous medium heated from below in 66 the absence of micropolar viscous effect, microinertia and rotation. The oscillatory modes are introduced due to the presence of the micropolar viscous effect, microinertia and rotation, which were non-existent in their absence. The sufficient conditions for the non-existence of overstability are also obtained. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:683 / 698
页数:16
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