Mixture Law for Viscosity

Abstract

ARRHENIUS¹ proposed the following expression for the viscosity of a solution : where η_s is the viscosity of the solution ; N₁ and η₁ are the mole fraction and the viscosity of component 1 ; N₂ and η₂ the mole fraction and the viscosity of component 2. However, both positive and negative deviations from this equation are found to occur. From a comparison of vapour pressures and viscosities of solutions, we deduced that in many cases the following equation yields closer agreement with experimental results : where d is a characteristic constant of the system. The accompanying graph shows curves calculated according to equations 1 and 2 (with d = -0·0224) for the system trans-decalin—cis-decalin. The points on the graph represent the experimental results of Bird and Daly².