Excess energy model

EOS MODEL = HVOS EXCESS ENERGY MODEL= NRTL... 

WS THE WOIilG-SANDLER UIXINQ RULE FOR BINARY VLE CALCULATIONS PENTANE ETHANOL 372.7 K EXCESS ENERGY MODEL = VAN LAAR K12=. 3084... 

WS THE WONG-SAHDLER MIXING RULE FOR BINARY VLE CALCDIATIONS msoh-watsr binary system EXCESS energy model = VAN LAAR K12=. 1000... 

YOU HAVE TO SELECT AN EXCESS ENERGY MODEL TO BE USED IN THE MIXING RULE. 

The penetration of mercury in MCM-41, a material with smooth cylindrical pores, takes place at the pressure indicated by the Washbum-Laplace model, indicating that this model is still valid at the scale of a few nanometers. When the pore surface is pitted with micropores or when the pores are interconnected, like in the case of SBA-15, the Washbum-Laplace model underevaluates the size of the pores, due to the excess energy needed for advancement of the meniscus beyond the surface defects. 

This model was introduced by Neville and Hunter (13,14) for the case of sterically stabilized dispersions which have undergone reversible flocculation. It is assumed that the major contribution to the excess energy dissipation in such pseudoplastic systems comes from the need to provide energy from the shear field to separate contacting particles. Under these conditions, the extrapolated yield value is given by the expression (13,32,33),... 

Equation (9.83) is also the basis for the compound energy model. The excess energy of the mixture is here represented by any type of equation, for example a power series [15, 16], Equation (9.83) has also been derived using the conformal solution theory after Blander [14] and as an extension of the molten salts models presented by Flood, Fprland and Grjotheim [17],... 

The earliest equations for Gibbs excess energy, like Margules and van Laar, were largely empirical. More recent equations and NRTL and UNIQUAC are based on a semiempirical physical model, called the two-liquid theory, based on local composition. The molecules do not mix in a random way, but because of different bonding effects, the molecules prefer a certain surrounding. This results in a composition at the molecular level, the local composition, which differs from the macroscopic composition. 

Cheng W. and Ganguly J. (1994). Some aspects of multicomponent excess free energy models with subregular binaries. Geochim. Cosmochim. Acta, 58 3763-3767. 

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