Archive - Известия Казанского государственного архитектурно-строительного университета.

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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Osipova L.E. – candidate of technical sciences, associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1 Nizamov I.I. – post-graduate student E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan National Research Technological University The organization address: 420045, Russia, Kazan, K. Marks st., 68
Title of the articleResearch of diffusion in multicomponent gas mixtures
Abstract.Designing of system of air cleaning and heating (cooling) assumes carrying out different calculation of mass and heat transfer processes. Is necessary to consider that the multi-component of medium and the process primarily are related to the diffusions phenomena. As a rule description of multi-component diffusion are based on equations of Stefan-Maxwell. These equations obtained from the solution of the Boltzmann equation. For the isothermal and adiabatic conditions these equations are rigorous approximation, which satisfies practical requirements. As an important assumption in the derivation of an equation was assumption of independence of the binary molecular diffusion coefficient of the gas mixture. Theoretical and experimental results confirm the validity of this assumption. Mathematical description diffusion process of multi-component gas mixtures is presented. The advantages of matrix models with comparison with obtained by the combined method equations of V.V. Dielman are shown. On the basis matrix equations of multi-component diffusion is developed mathematical model taking into account the dynamics of process in Stephen tube. The model was realized by the method of method of finite differences in Excel and Chem Cad. Three-component mixture - acetone, methanol and air was investigated. As a result, molar flows and concentrations, folding in each section of the tube as a result of the diffusion of volatile components (acetone, methanol) through a layer of inert gas (air), and the time to process a steady state were calculated. The formation of a stationary concentration profiles for 1 (acetone) and third (air) component along the tube was shown graphically. For the second component (methanol) profile qualitatively corresponds to the profile of the 1st component. Adequacy of the mathematical model is confirmed by comparing the values obtained profiles of concentrations of components with the results published in the literature.
Keywords.Multi-component diffusion, mass transfer, Stephen’s instrument, matrix model, equimolar process, dynamics.
For citations:Osipova L.E., Nizamov I.I. Research of diffusion in multicomponent gas mixtures // Izvestiya KGASU. 2012. №4(22) P.224-233.

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