Instability of mechanical equilibrium and some features of concentration convection in isothermal ternary gaseous systems
Zhussanbayeva A. Kossov V.N. Fedorenko O.V. Zhaneli M.
26 June 2022al-Farabi Kazakh State National University
Physical Sciences and Technology
2022#9Issue 155 - 61 pp.
Empirical research of the formation of convection streams in a ternary gaseous compound He + R12 – Ar at various pressures and concentrations of the miscible components has been implemented. Experimental data obtained have demonstrated that the intensiveness of convection streams increases with increasing pressure. It is noted that in the system under consideration, the initiation of convection streams is possible when the content of Freon-12 in the mixture is more than 0.1 mole fraction. A numerical study of the unstableness of mechanical balance in the mixture He + R12 – Ar with significantly different diffusion coefficients of gas mixture components has been carried out by means of the splitting scheme in terms of physical parameters. The presented mathematical model makes it possible to describe the process of formation of a convective structure for various compositions of mixture. The onset of instability is accompanied by the formation of curved concentration profiles. Within the numerical framework, the onset times of various mixing regimes are determined.
Convection , Diffusion , Gas mixtures
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Abai Kazakh National Pedagogical University, Almaty, Kazakhstan
Abai Kazakh National Pedagogical University
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