Abstract
There have been many empirical formulae proposed which would give the viscosity of a binary mixture of liquids in terms of the viscosities of the liquids and of the composition. Several years ago kinetic theory arguments were used to rederive an old formula due to Dolezalek and Schulze, which has the virtue of simplicity and, apparently, good accuracy. The parameters of this formula are the two fluid viscosities and a mutual viscosity. In this note we observe that such formulae fit exactly into the continuum theory of mixtures recently developed by us and others. We use Dolezalek's and Schulze's formula and thermodynamic restrictions, elsewhere derived, to present a generalized Navier-Stokes system for the flow of mixtures of liquids.
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