Keywords

molecular dynamics, alkanes, fluid viscosity

Abstract

Nonequilibrium molecular dynamics simulations have been performed on model fluids representing eicosane isomers in order to investigate the effect of branching and side chain position on fluid rheology. A heterogeneous, united-atom model with 20 Lennard-Jones interaction sites located at carbon centers was used to model the fluids. Vibrations and bond rotations were frozen, but torsional rotation was included. It was found that viscosity increases significantly from the n-alkane structure to a branch on carbon 2, but the movement of the branch along the carbon backbone has a smaller increasing than decreasing effect. The size of the group in a branched position has a more substantial effect upon the viscosity.

Original Publication Citation

Lahtela, Maija, Mikko Linnolahti, Tapani A. Pakkanen, and Richard L. Rowley. "Computer simulations of branched alkanes: The effect of side chain and its position on rheological behavior." The Journal of Chemical Physics 18 (1998): 2626-263

Document Type

Peer-Reviewed Article

Publication Date

1998-02-08

Permanent URL

http://hdl.lib.byu.edu/1877/1465

Publisher

AIP

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Chemical Engineering

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