Correlation and Prediction of Dense Fluid Transport Coefficients. VIII. Mixtures of Alkyl Benzenes with Other Hydrocarbons

Abstract

The aim of this article is to examine the application of the hard-sphere scheme to the prediction of the viscosity and thermal conductivity of hydrocarbon mixtures, other than n-alkane mixtures. According to this scheme, mixture properties are calculated from the pure components properties. Hence these are obtained first. Furthermore, in addition to the temperature, the density is the important parameter rather then the pressure. A Tait-type equation is employed to successfully correlate the density of the pure liquids. Furthermore, in the first part of this article, a modified form of the equation proposed by Sun and Teja is employed in the scheme, to correlate the viscosity and thermal conductivity of pure alkyl benzenes, some alkanes, some cycloalkanes, and one naphthalene. Following this, the article focuses on the successful prediction of the viscosity and thermal conductivity of mixtures of these compounds.

Extended hard-sphere model for predicting the viscosity of long-chain n-alkanes

“…As mentioned in the introduction, the recently proposed extended hard-sphere model [24] is the latest modification of the original hard-sphere model of Dymond, Assael and their collaborators [14][15][16][17][18]. As it forms the basis of the developments presented in this work we will briefly summarize its main features.…”

“…For dense fluids the only tractable solutions developed to date are based on the assumption that the molecules interact as hard spheres and that their collisions are uncorrelated. The resulting Enskog equation [13] for the viscosity of a dense hard-sphere fluid has formed the basis for several semi-theoretical approaches, two of which in particular have found practical application: the Dymond and Assael (DA) approach [14][15][16][17][18][19] and the Vesovic-Wakeham (VW) model [20][21][22][23]. In this work we focus on the DA approach with the objective of extending its versatility, so that we can predict the viscosity of pure, long-chain n-alkanes.…”

“…The DA model [14][15][16][17][18][19] is based on the observation that the viscosity of real fluids can be mapped onto a universal function by an appropriate choice of two parameters, the core volume and the roughness factor. Although for hard-spheres the core volume, which corresponds to the close-packed volume is athermal, for real fluids a temperature dependence was introduced [14] to account for the fact that the molecules interact through intermolecular potential that contains both repulsive and attractive parts.…”

On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: Effect of the temperature and pressure

“…The values of the characteristic parameters of eq. (17) The hard-sphere scheme, developed by Assael and Dymond, is based on the Enskog hardsphere theory [46,[66][67][68][69][70]. This powerful scheme allowed the correlation and prediction of the thermal conductivity and viscosity of a wide range of simple molecules, alkanes, aromatic hydrocarbons, alcohol as well as mixtures of liquids in an homologous series over a wide range of temperatures and pressures with a relative uncertainty of 5% [71].…”

Density and viscosity study of pyridinium based ionic liquids as potential absorbents for natural refrigerants: Experimental and modelling

“…Over the last decades HS has been applied to model different families of molecular compounds [13][14][15]34,35] By assuming that mixtures behave in the same way than pure compounds, Assael proposed mixing rules (Eqs. (16) and (17)).…”