The heat and mass transfer characteristics of natural convection about a vertical surface embedded in a saturated porous medium subject to variable viscosity are numerically analyzed. by taking into account the diffusion-thermo (Dufour) and thermal-diffusion (Soret) effects. The governing equations of continuity. momentum. https://www.bekindtopets.com/great-deal-Psithurisme-Definition-Affiche-great-choice/