Double diffusive buoyancy opposed natural convection in a porous cavity having partially active vertical walls

The present study is focused to analyse buoyancy opposed double diffusive natural convection in a square porous cavity having partially active thermal and solutal walls. Five different partially active zones are considered along the vertical walls, while the remaining portions of the vertical walls along with the top and bottom walls of the cavity are considered to be adiabatic and impermeable. Darcy–Brinkman–Forchheimer model is used to study the flow, heat and solute transfer in porous media. The solution is done by control volume integration. Modified MAC method is used for the numerical solution of governing equations. Gradient dependent consistent hybrid upwind scheme of second order (GDCHUSSO) is used for discretization of the convective terms. Numerical simulations have been done for different combinations of partially active zones to reveal their effect on heat and mass transfer. The pertinent parameters those affect the flow such as; buoyancy ratio, Darcy number and active zone locations have been identified and their effects have been studied. The parametric results are provided in graphical and tabular form. Flow lines, isotherms, isoconcentrations contour maps are provided to bring clarity in the understanding of the momentum, heat and solute transport phenomenon.