Double-diffusive natural convection induced by a wavy surface in a stratified porous medium

In this study, heat and mass transfer near a vertical wavy surface embedded in a mass and thermally stratified porous medium has been employed. The complex wavy surface is transformed to a flat plate by a suitable coordinate transformation, and the obtained boundary layer equations are solved by the local nonsimilarity method under a MAT-LAB setup. Influence of the buoyancy ratio, Lewis number, amplitude-wavelength ratio, and thermal and mass stratification levels oil the local Nusselt and local Sherwood numbers are analyzed. Presence of mass andlor thermal stratification in the porous domain decreases both the heat and mass transfer from the wavy surface into the porous medium. The amplitude of harmonic curves for the local Sherwood and local Nusselt numbers tend to decrease away from the leading edge of vertical surface either oil increasing thermal or mass stratification, or oil decreasing buoyancy ratio. Further, these curves also droop downward with mass or/and thermal stratification. Both the average Nusselt and average Sherwood numbers are found to be constantly smaller than those of the corresponding flat plate.