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Unsteady diffusion in ternary gas mixtures
Author(s) -
Arnold K. R.,
Toor H. L.
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130518
Subject(s) - thermal diffusivity , ternary operation , thermodynamics , mass transfer , diffusion , hydrogen , nonlinear system , boundary value problem , lewis number , differential equation , mechanics , chemistry , mathematics , mathematical analysis , physics , organic chemistry , quantum mechanics , computer science , programming language
Unsteady diffusion in the system methane‐argon‐hydrogen was studied in a Loschmidt apparatus with large changes in concentration. The mean concentration‐time history was predicted within experimental error by the linearized equations of multicomponent mass transfer. In the calculations the Stefan‐Maxwell equations were used to obtain the diffusivity matrix which was evaluated at the equilibrium concentration. Digital computer solutions to the nonlinear differential equations were also obtained for various systems and boundary conditions. The fluxes predicted by the linearized equations with the diffusivity matrix evaluated at the arithmetic average of the initial and boundary concentrations were in all cases within 5% of the numerical predictions.