MARANGONI CONVECTION IN A SQUARE POROUS CAVITY

Convection may occur in different processes, which may not depend on t he buoyancy force. One of these processes is due to the surface tensio n gradient also known as Marangoni convection. Such convection creates a strong flow leading to instability for a fluid. Porous medium consi sts of solid matrix with an interconnected void-filled with a fluid, A new treatment of the surface tension gradient at the free surface for a porous medium showed the occurrence of convection due to a temperat ure gradient normal to the free surface. It was concluded that this co nvection, being strong at the free surface, might create instability s imilar to Marangoni-Benard phenomenon.