(1)	$\begin{array}{l}\displaystyle {\nu}_{12} = \exp \left[ \, \exp \left(\frac{A_{12}-10.975}{14.534} \right) - 0.8 \, \right]\end{array}$

(2)	$\begin{array}{l}\displaystyle A_{12} = y_1 \, A_1 + y_2 \, A_2\end{array}$

(3)	$\begin{array}{l}\displaystyle A_i = 14.534 \, \ln \left[ \, \ln \left( \nu_i + 0.8 \right) \, \right] + 10.975, \ \ i = \{ 1,2\}\end{array}$

where

$\begin{array}{l}\nu_{12}\end{array}$	kinematic viscosity of fluid mixture	$\begin{array}{l}\nu_1\end{array}$	kinematic viscosity of the 1^st fluid component	$\begin{array}{l}\nu_2\end{array}$	kinematic viscosity of the 2^nd fluid component
		$\begin{array}{l}y_1\end{array}$	weight fraction of the 1^st fluid component	$\begin{array}{l}y_2\end{array}$	weight fraction of the 2^nd fluid component

References

ASTM D7152, Standard Practice for Calculating Viscosity of a Blend of Petroleum Products. ASTM Book of Standards, vol. 05.04.

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