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

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 2 5 O C , and gives good agreement with experiment. Experimental viscosities for ethanol/n-hexane, for n-propanol/ water, and for four multi-component mixtures at 2 5 O C are presented. hile many models have been developed relating ConclusionsThe group solution model presented gives a reasonable representation of liquid mixtures containing the Manuscript

PVT, viscosity, and surface tension of ethanol: New measurements and literature data evaluation

“…The selection of the literature sources of data taking into account the dynamic viscosity deviation from the mean value at temperatures in the range (273.15 to 338.15) K at 5 K intervals (35 sources of data) was made. The sources of data rejected for the fitting were those of Findlay [33], Muchin [35], Ratcliff and Khan [44], Tanaka value of C is near the glass transition temperature of ethanol, T g = 96 K found from dielectric spectroscopy techniques applied to the supercooled liquid and the rotator-phase crystal of ethanol by Miller et al [83]. The parameter C is usually taken as a measure of the ideal glass transition temperature and is roughly (15 to 40) K less than T g .…”

Viscosity of liquid hydrocarbons and their mixtures

“…Assuming that the viscosity p T at a constant temperature T can be described as function of the number of carbon atoms nc by Ratcliff and Khan (1971) define an "ideal solution viscosity" that is equivalent to Eq. 26b.…”

Viscosities of binary mixtures of some n-ethoxyethanols with ethyl tert-butyl ether at T=(293.15, 298.15, and 303.15)K

“…The values of b j coefficients and the standard deviations r(ln g) are summarized in The deviation of the viscosity from a mole fraction average was calculated from the following equation [6][7][8]:…”