Prediction of the viscosities of liquid mixtures by a group solution model

Abstract

Abstract Group solution models of liquid mixtures have been used previously to predict thermodynamic properties of non‐ideal systems. A model of this type has been developed which enables the viscosities of liquid mixtures to be predicted. The concept of an “ideal viscosity” is introduced, and allowance made for the interaction between the groups present and for the structural contributions of differing molecules. Predictions require a knowledge of only the viscosities of the pure components of a mixture. It has been tested for mixtures of alkanes, alcohols and water at 25°C, and gives good agreement with experiment. Experimental viscosities for ethanol/n‐hexane, for n‐propanol/water, and for four multi‐component mixtures at 25°C are presented.