\ln {\mu}_{12} = x_1 \cdot \ln {\mu}_1 + x_2 \cdot \ln {\mu}_2 

where

dynamic viscosity of fluid mixture 

dynamic viscosity of the 1st fluid component

dynamic viscosity of the 2nd fluid component



mole fraction of the 1st fluid component

mole fraction of the 2nd fluid component


The most straightforward generalization is provided by Lederer-Roegiers equation.

See also


Physics / Fluid Dynamics / Fluid Mixing Rules / Mixing Rules for Viscosity