On the wavevector dependent shear viscosity of a simple fluid

Travis, Karl P., Searles, Debra J. and Evans, Denis J. (1999) On the wavevector dependent shear viscosity of a simple fluid. Molecular Physics, 97 3: 415-422. doi:10.1080/00268979909482841

Author Travis, Karl P.
Searles, Debra J.
Evans, Denis J.
Title On the wavevector dependent shear viscosity of a simple fluid
Journal name Molecular Physics   Check publisher's open access policy
ISSN 0026-8976
Publication date 1999
Sub-type Article (original research)
DOI 10.1080/00268979909482841
Volume 97
Issue 3
Start page 415
End page 422
Total pages 8
Place of publication London
Publisher Taylor & Francis
Collection year 1999
Language eng
Subject C1
250602 Statistical Mechanics
780103 Chemical sciences
Abstract Non-equilibrium molecular dynamics (NEMD) simulations employing the sinusoidal transverse force (STF) method are used to calculate the wavevector and strain rate dependent sheer viscosity of a WCG fluid at a zero wavevector number density of 0.8442, and zero wavevector temperature of 0.722. The functional form of the dependence of shear viscosity on the strain rate and wavevector are examined, in the zero field limit. The ramifications of these results for the possible existence of the Burnett coefficients are discussed. The shear rate dependent viscosity for a range of wavevectors can be fitted to both a Cross analytical form and a formula derived from Quentrec`s local order theory. Also it can be fitted to two square-root regimes. The extrapolated zero strain rate viscosities are consistent with a Lorentzian functional form, a Taylor series expansion in q(2) and also to a q(3/2) variation at low wavevector. This study reveals that with current computational resources it is still not possible to establish the validity of the Burnett coefficients.
Keyword Physics, Atomic, Molecular & Chemical
Nonequilibrium Molecular-dynamics
Linear Viscous-flow
2-dimensional Fluids
Parallel Algorithm
Number Dependence
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Australian Institute for Bioengineering and Nanotechnology Publications
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Created: Tue, 10 Jun 2008, 14:29:18 EST