Prediction of the Kinematic Viscosity of Multicomponent Liquid Mixtures: A Generalized McAllister Four-Body Interaction Model and Its Truncation into a Pseudo-Binary Model

The prediction of the dependence of viscosity on composition is required in many instances in engineering calculations, especially those required for an equipment design. The present communication reports the development of a generalized McAllister four-body interaction for predicting the dependence of viscosities of nonelectrolyte liquid multicomponent systems on composition. The authors also utilized the pseudo-binary model and incorporated it into the McAllister model in order to reduce the number and complexity of parameter calculations at a relatively small expense of the accuracy of predictions. The results clearly show that the four-body interaction model performs better than the generalized McAllister three-body collision model reported earlier by Nhaesi and Asfour. The four-body model performs better for cases where the molecular size ratio between the smallest and largest components in a system exceeds 1.5.