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Simulations of Lubricants in Confined Geometries

Published online by Cambridge University Press:  10 February 2011

Mark J. Stevens ,
Maurizio Mondello  and
Gary S. Grest
Mark J. Stevens
Affiliation:
P.O. Box 5800, MS 1111, Sandia National Laboratory, Albuquerque, NM 87185–1111
Maurizio Mondello
Affiliation:
Corporate Research Science Laboratories, Exxon Research and Engineering Company, An-nandale, NJ 08801
Gary S. Grest
Affiliation:
Corporate Research Science Laboratories, Exxon Research and Engineering Company, An-nandale, NJ 08801
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Abstract

We examine the shear flow of hexadecane and squalane confined between plates with nm separation using molecular dynamics simulations. For both molecules substantial slip occurs at the walls and the density profile exhibits strong oscillations. In contrast to surface force apparatus measurements, our calculated effective viscosities are not much greater than bulk viscosities, but the simulations shear rates are much larger than the experimental ones. The actual viscosity calculated using the shear rate measured from the observed velocity profile is almost equal to the bulk viscosity within uncertainty.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 65
Copyright
Copyright © Materials Research Society 1997

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