Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering

NUMERICAL INVESTIGATION OF EHD INSTABILITY OF NATURAL CONVECTION IN A VERTICAL DIELECTRIC FLUID SATURATED ANISOTROPIC POROUS LAYER

B. M. Shankar
Department of Mathematics, PES University, Bangalore 560 085, India

Jai Kumar
ISRO Space Application Centre, Ahmadabad 380015, India

I. S. Shivakumara
Department of Mathematics, Bangalore University, Bangalore-560 056, India

DOI: 10.1615/TFEC2019.fnd.028472
pages 1061-1070


KEY WORDS: Instability, Forchheimer model, natural convection, dielectric fluid, vertical porous layer

Abstract

The stability of natural convection in an anisotropic vertical dielectric fluid saturated porous layer is investigated in the presence of a uniform horizontal AC electric field numerically using Galerkin method. The porous medium is assumed to be anisotropic both in permeability as well as thermal diffusivity. The flow in the porous medium is described by Brinkman-Wooding-Forchheimer-extended Darcy model. The critical Grashof number is extracted with respect to wave number for different values of physical parameters. It is observed that increase in the Forchheimer number, mechanical and thermal anisotropy parameters exhibit stabilizing effect on the system, while an opposite trend is noticed with increasing Darcy number and AC electric Rayleigh number. The effect of increasing Prandtl number has a destabilizing effect on the system. Besides, simulations of secondary flow and energy spectrum are analyzed for various values of physical parameters.

Purchase $20.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page