Thermo-Solutal Convection in Ventilated Cavity with a Reactive Porous Separation: Case of Depollution

In order to improve the depollution rate and therefore the air quality in premises, which have different uses by the occupants, the effect of eliminating pollutants by chemical reaction was added to ventilation by displacement. In this study, a numerical simulation of a mixed, double diffusive convection in a contaminant rectangular cavity with an aspect ratio equal to two, ventilated with fresh air by two diagonally opposite openings, with a reactive porous partition, fixed in the center of the lower wall. The right-side wall is brought to a constant hot temperature while the other walls are adiabatic. The momentum, heat and mass transfer equations were modeled by the Darcy-Brinkman-Forchheimer flow model. The reaction term in the mass transfer equation is translated by the Arrhenius model. The Lattice Boltzmann method with a multiple relaxation time (LBM-MRT) is used to resolve the obtained system of equations. The results are illustrated in terms of streamlines, isotherms and iso-concentrations according to the different control parameters (Ri, Da). The results of ventilation efficiency indices and the transfer rate are also presented. It was concluded that the optimal pollution control rate efficiency was obtained when the reaction was present