Generation of Thermogravitational Convection and Convective Diffusion in a Radiation-Heated Region

We present the results of the numerical investigation of the generation of thermogravitational convection and convective diffusion as a result of the radiation flux action on the internal boundaries of the walls of a closed rectangular region filled with the air. The conditions of the development and the characteristics of hydrodynamic and thermophysical processes occurring as a result of the heating of surface layers of the walls during the radiation heating are established. The relationship between the radiation heating strength and the convective heat and mass transfer is derived. The time-dependent fields of the temperature and the concentrations of anthropogenic gas admixture illustrate a considerably greater intensity of the heat transfer generated by the radiation heat flux compared with the conductive heat transfer and the convective diffusion compared with molecular diffusion.