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ON THE ONSET OF ELECTROHYDRODYNAMIC INSTABILITY IN A COUPLE-STRESS NANOFLUID SATURATING A POROUS MEDIUM

Volumen 10, Ausgabe 6, 2019, pp. 539-553
DOI: 10.1615/SpecialTopicsRevPorousMedia.2020030166
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ABSTRAKT

In this paper, electrohydrodynamic thermal instability in a horizontal layer of an elastico-viscous nanofluid saturating a porous medium under the action of a vertical AC electric field is investigated. A couple-stress fluid model is used to describe the rheological behavior of nanofluid, and for a porous medium the Darcy model is employed. The model used for nanofluid includes the effects of thermophoresis and Brownian diffusion. Nanoparticle flux is assumed to be zero on the boundaries, and the temperature can be imposed on the boundaries. The problem is solved by applying linear stability analysis based upon perturbation theory and normal mode analysis for isothermal free-free boundaries analytically and numerically. The effects of the couple-stress parameter, AC electric field, Lewis number, modified diffusivity ratio, nanoparticle Rayleigh number, and medium porosity have been discussed for the case of stationary convection. Oscillatory convection does not exist under the present boundary conditions.

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REFERENZIERT VON
  1. El-Sayed Mohamed Fahmy, Alanzi Agaeb Mahal, Electrohydrodynamic Liquid Sheet Instability of Moving Viscoelastic Couple-Stress Dielectric Fluid Surrounded by an Inviscid Gas through Porous Medium, Fluids, 7, 7, 2022. Crossref

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