Problems linked to the description of multicomponent diffusion and to its extension to the non-isothermal case

摘要

The generalisation of the formalism introduced by J.Stefan and M.Maxwell is derived from Thermodynamics of Irreversible Processes. The general form obtained Accounts for all the possible migratory processes, Including thermodiffusion, in solution having isotropic Properties. The cases of inverse diffusion, diffusion and Thermodiffusion near critical points or the Phenomenological coefficients variations with the state Variables seem to become much more tractable by this Formalism. The use of the theory into the multicomponent Mass transport experiments to be performed in a near Future in microgravity in the DCCO experiment and in The SCCO experiment(respectivelyDiffusionand Soret Coefficients of Crude Oils)is exposed.