RAYLEIGH-TAYLOR INSTABILITY IN A THIN-FILM BOUNDED BY A POROUS LAYER

The Rayleigh Taylor stabilty in a finite thickness layer of a viscous fluid bounded below by a densely packed thick porous thick porous laye r and above by a rigid surface has been studied subject to linear anal ysis using approximations in efect similar to lubrication and Stokes a pproximations. The problem is studied analytically. It is shown that t he nature of the linear stability curve is controlled by the slip para meter a and the thickness of the fluid layer h, while its shape is con trolled by the ratio of the surface tension to the normal stress.