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ISSN Печать: 2151-4798
ISSN Онлайн: 2151-562X
Indexed in
THERMOHYDRODYNAMIC INSTABILITY OF VISCOUS ROTATING DIELECTRIC FLUID LAYER IN POROUS MEDIUM WITH VERTICAL AC ELECTRIC FIELD
Краткое описание
The effects of uniform rotation and porous medium on the onset of convective instability in a dielectric fluid confined between two horizontal planes under the simultaneous action of a vertical ac electric field and a vertical temperature gradient is considered. Applying linear perturbation theory and approximations analogous to the usual Boussinesq approximations, an equation of tenth order is derived. Under appropriate boundary conditions, this equation is solved exactly and the eigenvalue equations for the critical electrical Rayleigh number are obtained for both the cases of exchange of stabilities and overstability, respectively. The corresponding critical wave numbers are also obtained for both cases. It is shown that the medium permeability and Rayleigh number have destabilizing effects on the considered system, where as the porosity of porous medium, Taylor number, and Prandtl number have stabilizing effects. It is found also that, at high values of Taylor number or at any value of Prandtl number, the critical electrical Rayleigh number is independent of the Rayleigh number.
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El-Sayed M. F., Moussa M. H. M., Hassan A. A. A., Hafez N. M., Electrohydrodynamic Instability of Two Thin Viscous Leaky Dielectric Fluid Films in a Porous Medium, ISRN Applied Mathematics, 2011, 2011. Crossref
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El-Sayed M.F., Moussa M.H.M., Hassan A.A.A., Hafez N.M., Stability of Viscoelastic Fluid Flowing Through Porous Medium Down Non-uniformly Heated Inclined Plane, Heat Transfer-Asian Research, 44, 2, 2015. Crossref
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El-Sayed M. F., Haroun M. H., Mostapha D. R., Electrohydrodynamic peristaltic flow of a dielectric Oldroydian viscoelastic fluid in a flexible channel with heat transfer, Journal of Applied Mechanics and Technical Physics, 55, 4, 2014. Crossref