Isothermal multicomponent diffusion in three-component gas mixtures He + Ar - N_2 and CH_4 + Ar - N_2 at different pressures and certain concentrations of components in the binary mixtures is experimentally studied. It is shown that convective instability, which significantly intensifies the multicomponent mass transfer, occurs due to the pressure increase in systems where diffusion coefficients are significantly different from each other. Parameters characterizing the transition of diffusion mixing into the convective one can be determined by the numerical simulation methods. Modelling of the multi-component mixing process is carried out by means of the joint solution of the Navier-Stokes equations, diffusion equations and continuity equation. It is shown that essentially non-linear distributions of the component concentrations that lead to non-linear distribution of the density of the gas mixture, which is responsible for the formation of convective structures, arises at a certain pressure in the system.
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机译：在实验研究不同压力下的三组分气体混合物中的等温型气体混合物和CH_4 + Ar - N_2在不同压力下，在二元混合物中的某些浓度的组分。结果表明，由于漫射系数彼此显着不同的系统的压力增加，对流不稳定性显着增强了多组分传质。表征扩散混合到对流的转变的参数可以通过数值模拟方法确定。多组分混合过程的建模通过Navier-Stokes方程，扩散方程和连续性方程的联合溶液进行。结果表明，导致气体混合物密度的非线性分布的组分浓度基本上是非线性分布，其负责形成对流结构的一定压力。
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