(1)	$\begin{array}{l}\displaystyle \ln {\mu}_{12} = x_1 \cdot \ln {\mu}_1 + x_2 \cdot \ln {\mu}_2 + \epsilon \, x_1 \, x_2 + K_1 \, x_1 \, x_2 \, (x_1 - x_2) + K_2 \, x_1 \, x_2 \, (x_1 - x_2)^2\end{array}$

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
$\begin{array}{l}\epsilon, \, K_1, \, K_2\end{array}$	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 parameters $\begin{array}{l}\epsilon, \, K_1, \, K_2\end{array}$ can be fitted to lab data.

Reference

S.L. Oswal,H.S. Desai, Studies of viscosity and excess molar volume of binary mixtures. Fluid Phase Equilibria 149(1998) 359-376.

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