Abstract
The onset of electroconvection in a horizontal dielectric fluid saturated with a densely packed porous layer subjected to uniform temperature gradient and an alternating electric field is investigated. The dielectric constant is assumed to be a linear function of temperature. The boundaries are considered to be free-free and isothermal. Modified Darcy equation is used to describe the flow in porous medium and solution to the resulting eigenvalue problem is obtained using a regular perturbation method with small amplitude approximation. The shift in the electric Rayleigh number is calculated as a function of Darcy number, Rayleigh number, frequency of electric modulation and Prandtl number and their effects on the stability of the system are discussed.
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