Rheological, thermodynamic, and structural studies of linear and branched alkanes under shear

Rajesh Khare, Juan De Pablo, Arun Yethiraj

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Abstract

The Theological, thermodynamic, and structural behavior of linear and branched alkanes in simple shear is investigated using nonequilibrium molecular-dynamics simulation of united atom model fluids. Our results for the zero-shear viscosity of pure linear alkanes as well as mixtures of alkanes are in reasonable agreement with experiment. Simulation results for intermediate molecular weight linear alkanes indicate that the simple models employed here are capable of describing the pressure and temperature dependence of the viscosity. More importantly, our calculations indicate that addition of short, flexible branches to alkanes leads to a viscosity enhancement of a factor of 2 or more, thereby offering interesting possibilities for formulation of lubricants with specific properties.

Original languageEnglish
Pages (from-to)6956-6964
Number of pages9
JournalJournal of Chemical Physics
Volume107
Issue number17
DOIs
StatePublished - Nov 1 1997

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