A simple relation for the excess functions of nonrandom mixtures

A simple relation to predict or to correlate the excess functions of multicomponent mixtures

“…The Kreglewski et al (1985) model for binaries with three parameters has been verified in this work. We have compared this relation with the three-parameter NRTL (non-random two-liquid) equation and have listed the results in Table 1.…”

“…For example, in a binary mixture, two-body interactions occur as l-l, 2-2, and l-2, while three-body interactions occur as l-l-l, 2-2-2, l-l-2 and l-2-2. Kreglewski et al (1985) have assumed that the minimum of the intermolecular energy, E,, is equal to the sum of two-body and three-body interactions for binary mixtures. Goldman (1978) notes that the contributions of three-body interactions are small compared to those of two-body interactions, although Benmekki and Mansoori (1988) show that three-body interactions can be significant near a ternary critical point.…”

“…These empirical formulations have highly correlated parameters, which cause problems in their extension to multicomponent systems. We use semi-theoretical, three-parameter relations for the excess functions of binary mixtures developed by Kreglewski et al (1985) and extend them to multicomponent mixtures using only binary data. We assume that two-body and three-body interactions are significant in our relations.…”

A new equation to correlate liquid kinematic viscosities of multicomponent mixtures

“…This work combines the Kreglewski et al [7] work with the Eyring theory of absolute rates to develop a new viscosity equation. The new equation can correlate the liquid viscosities for binary systems.…”

“…Moumouzias and Ritzoulis [6] have not tested their expression with other binary systems. On the other hand, Kreglewski et al [7] have suggested that a random mixture can have a quadratic mixing rule for the Gibbs energy. They also claim that true interaction parameters depend upon composition.…”