On constitutive choices for growth terms in binary fluid mixtures

The differential system of balance equations for a binary mixture of fluids as the system of a single fluid, plus that relating to diffusive motion, is used to present constitutive proposals for the terms of exchange and to verify the metaphysical principles of Truesdell. After two particular examples are considered presenting peculiar constitutive relations for such growth terms and study small plane waves in order to verify the influence of these terms on the solutions.