(1)	$\begin{array}{l}\displaystyle \ln {\mu}_{12} = x_1 \cdot \ln {\mu}_1 + x_2 \cdot \ln {\mu}_2 + \epsilon \, x_1 \, x_2\end{array}$

where

$\begin{array}{l}\mu_{12}\end{array}$	dynamic viscosity of fluid mixture	$\begin{array}{l}\mu_1\end{array}$	dynamic viscosity of the 1^st fluid component	$\begin{array}{l}\mu_2\end{array}$	dynamic viscosity of the 2^nd fluid component
$\begin{array}{l}\epsilon\end{array}$	empirical model parameters	$\begin{array}{l}x_1\end{array}$	mole fraction of the 1^st fluid component	$\begin{array}{l}x_2\end{array}$	mole fraction of the 2^nd fluid component

The empirical parameter $\begin{array}{l}\epsilon\end{array}$ can be fitted to lab data.

Reference

L. Grunberg, A.H. Nissan, The energies o vaporization, viscosity and cohesion and the structure o liquids. Trans.Faraday Soc. 45 (1949) 125-137 cc.

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