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The double-diffusion mixed convection in a rectangular cavity with a porous structure was studied using numerical simulation. The influence of the Rayleigh number Ra, the porosity of the porous structure, the buoyancy ratio N and the distance of the porous structure from the left wall surface Xp on the flow characteristics were discussed by streamline, heatline, massline, Nu and Sh. It is found that the low floating-to-lift ratio has little effect on the heat transfer. When the buoyancy ratio is 5, the Nu number is linearly positively correlated with the porosity. When N&lt;-1, the heat and mass transfer intensity is inversely proportional to the lift-up ratio.

Numerical simulation of double-diffusion natural convection in rectangular square cavity with porous enclosure