R. El Ayachi - Sultan Moulay Slimane University, Faculty of Sciences and Technologies, Physics Department, Laboratory of Flows and Transfers Modelling (LAMET), B.P. ۵۲۳, Béni-Mellal ۲۳۰۰۰, Morocco
A. Raji - Sultan Moulay Slimane University, Faculty of Sciences and Technologies, Physics Department, Laboratory of Flows and Transfers Modelling (LAMET), B.P. ۵۲۳, Béni-Mellal ۲۳۰۰۰, Morocco
M. Hasnaoui - Cadi Ayyad University, Faculty of Sciences Semlalia, Physics Department, Laboratory of Fluid Mechanics and Energetics (Laboratory affiliated to CNRST URAC۲۷), B.P. ۲۳۹۰, Marrakech, Morocco
A. Abdelbaki - Cadi Ayyad University, Faculty of Sciences Semlalia, Physics Department, Laboratory of Fluid Mechanics and Energetics (Laboratory affiliated to CNRST URAC۲۷), B.P. ۲۳۹۰, Marrakech, Morocco
M. Naïmi - Sultan Moulay Slimane University, Faculty of Sciences and Technologies, Physics Department, Laboratory of Flows and Transfers Modelling (LAMET), B.P. ۵۲۳, Béni-Mellal ۲۳۰۰۰, Morocco

studied numerically. The left vertical wall of the cavity is heated with a temperature varying sinusoidally in time, while the opposite cold wall is maintained at a constant temperature. The same walls of the cavity are salted with constant and different concentrations (the concentration of the heated wall is higher than that of the cooled one). The remaining horizontal walls are considered adiabatic and impermeable. The parameters governing the problem are the amplitude of the variable temperature (۰ £ a £ ۱), its period (۰.۰۰۰۱ £ t £ ۱۰), the buoyancy forces ratio (-۵ £ N £ +۵), the Lewis number (۰.۱ £ Le £ ۱۰) and the thermal Darcy-Rayleigh number (RT = ۴۰۰). Effects of these parameters on fluid flow, temperature and concentration distributions and mean heat and mass transfers within the cavity are analyzed. Results obtained show that both heat and mass transfers could be significantly enhanced or reduced, with respect to those generated in the case of constant heating conditions by proper choice of the parameters related to the periodic temperature.

double diffusive natural convection, Numerical study, periodic heating, Porous medium, resonance phenomenon