This study is a computational work devoted to mathematical simulation of three-dimensional conjugate heat and mass transfer in an enclosure having finite thickness walls with local heat and mass sources. The mathematical model written in dimensionless variables “vorticity vector – vector potential functions – temperature – concentration” has been solved using an iterative implicit finite-difference method. The heat and mass transfer characteristics of the three-dimensional enclosure have been analyzed using the streamlines, temperature and concentration fields. Main attention was paid to the effects of the Rayleigh number, buoyancy ratio and transient factor on the heat and mass transfer modes. The correlations describing the dependences of average Nusselt and Sherwood numbers on the thermal Rayleigh number have been obtained.

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