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Journal of Porous Media
Fator do impacto: 1.49 FI de cinco anos: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

Volumes:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.v9.i7.40
pages 651-662

Effect of Anisotropy on Stability of Convection in a Rotating Porous Layer Distant from the Center of Rotation

Saneshan Govender
School of Mechanical Engineering, University of Kwa-Zulu; School of Mechanical Engineering, University of Natal, Durban, South Africa; Eskom Holdings Ltd, Engineering Department (Gas Division), Eskom Enterprises Park, Simba Road, Sunninghill, Johannesburg

RESUMO

We investigate Rayleigh-Benard convection in an anisotropic porous layer subjected to centrifugal body forces and offset from the center of rotation. The Darcy model (including centrifugal and permeability anisotropy effects) and a modified energy equation (including the effects of thermal anisotropy) are used in the current analysis. The linear stability theory is used to evaluate the critical Rayleigh numbers (one for porous layers placed close to the center of rotation and the other for porous layers placed far away from the center of rotation) for the onset of convection in the presence of thermal and mechanical anisotropy. It is found that the convection is stabilized when the thermal anisotropy ratio (which is a function of the thermal and mechanical anisotropy parameters) is increased in magnitude.