The boundary of “diffusion – concentration gravitational convection” regime change in the isothermal ternary gas mixture of methane-butane-difluorodichlor-methane with various compositions in vertical cylindrical channels

V. N. Kossov^a, O. V. Fedorenko<sup>b

a</sup> Kazakh National Pedagogical University
^b SRI of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty

Abstract: Analysis of experimental data on diffusion in a ternary mixture of methane –butane–dichlorodifluoromethane showed that conditions of the convective instability can be realized in the system, which leads to the appearance of specific currents enriched by the component with the highest molecular weight. Such mixing is atypical for multicomponent diffusion mass transfer. To establish the conditions associated with the change in the “diffusion–concentration gravitational convection” regimes, a calculation methodthat makes it possible to determine the boundary of the kinetic transition in vertical cylindrical channelsis proposed within the framework of stability theory.The proposed approach was compared with the experimental data and showed sufficient reliability to determine the regions of diffusion and concentration convection at different compositions of the mixture under investigation.

Received: 03.10.2018