In this paper thermodiusion in a mixture of viscous uids is described by using a procedure of classical irreversible thermodynamic (CIT) with internal variables. In particular, the deviation from local equilibrium is characterized by some vectorial internal variables - and a generalized entropy current density in terms of current multipli- ers (,). The coupling between mass diusion and heat conduc- tion is taken into account and phenomenological generalizations of Fick's, Fourier's and Newton's laws are also obtained.
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