A friction-theory-based model for the viscosity of alcohol-water mixtures

A. Ruiz-Llamas1 and R. Macías-Salinas1

1SEPI-ESIQIE, Instituto Politecnico Nacional, Mexico

Keywords: model, friction theory
property: viscosity
material: alcohol-water mixtures

Since the debut of the friction theory (f-theory) in 2000 [1], much has been published about the beauties of this approach in accurately modeling the dynamic viscosity of pure fluids and their mixtures. However, there is still a gap to be filled in terms of modeling scope using the f-theory. His creator (Prof. Quiñones-Cisneros) and co-workers have widely demonstrated the suitability of the f-theory approach in mostly representing the viscosity of hydrocarbon mixtures with great accuracy. For complex mixtures containing highly polar and associating compounds, to best of our knowledge there is no a viscosity modeling approach based on the f-theory so far reported that deals with this type of mixtures. Therefore, the purpose of this work was to develop a f-theory-based model to accurately represent the dynamic viscosity of highly non-ideal mixtures; those exhibiting a minimum and/or a maximum in their viscosity-composition functions. The performance of the present model is discussed during the representation of experimental viscosities of selected alcohol-water mixtures over wide ranges of temperature and pressure and over the whole composition range.

  1. S. E. Quiñones-Cisneros, C. K. Zéberg-Mikkelsen, E. H. Stenby, The Friction Theory (f-Theory) for Viscosity Modeling, Fluid Phase Equilibria, 169, 249 (2000).

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