Effect of inclined temperature gradient on thermal instability in an anisotropic porous medium

Effect of anisotropy on thermal instability in a fluid saturated porous medium subjected to an inclined temperature gradient of finite magnitude is analysed using Galerkin technique. Results are compared with those of isotropic and horizontally isotropic cases. It is observed that anisotropic medium is the most stable while either isotropic situation or the horizontally isotropic situation is the most unstable one depending on the horizontal Rayleigh number (R _H ), anisotropy parametersk ₁(=k _y /k _x ), and ?₂(=?_γ/? _z ).