Publication de 12 numéros par an
ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508
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MHD Instability of Rotating Superposed Walters B′ Viscoelastic Fluids through a Porous Medium
RÉSUMÉ
The Rayleigh−Taylor instability of Walters B′ viscoelastic fluids in a porous medium in the presence of uniform rotation and a variable magnetic field is considered. The magnetic field, viscosity, viscoelasticity, and density are assumed to be exponentially varying. For stable density stratification, the system is found to be stable for disturbances of wave numbers subject to the condition that v′0 < k1⁄ε. The magnetic field stabilizes the potentially unstable stratification for small wave-length perturbations which are otherwise unstable. The long wave-length perturbations remain unstable and are not stabilized by a magnetic field. Rotation does not affect the stability or instability, as such, of a stratification.