International Journal of Thermophysics

, Volume 4, Issue 2, pp 97–114

Pressure tensor and viscosity coefficients of a soft sphere liquid under shear

  • S. Hess
  • H. J. M. Hanley

DOI: 10.1007/BF00500134

Cite this article as:
Hess, S. & Hanley, H.J.M. Int J Thermophys (1983) 4: 97. doi:10.1007/BF00500134


General properties and consequences of the distortion of the structure of a simple liquid subjected to a planar shear flow are reported. In particular, the orientational distribution of particles in the first coordination shell around a given particle is analyzed, and the effect of this distribution on the pressure tensor is discussed. The distorted distribution gives rise to a set of non-Newtonian viscosity coefficients reflecting the occurrence of normal pressure differences in the liquid. Numerical values of these viscosities are given for a soft sphere fluid at 7/8 of the freezing density using the technique of nonequilibrium molecular dynamics. A wide range of shear rates is considered and all viscosity coefficients are found to be functions of the shear rate.

Key words

nonequilibrium molecular dynamics non-Newtonian effects radial distribution function Theological behavior viscosity 

Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • S. Hess
    • 1
  • H. J. M. Hanley
    • 1
  1. 1.Chemical Engineering Science DivisionNational Bureau of StandardsBoulderUSA
  2. 2.Institut für Theoretische PhysikUniversity of Erlangen-NürnbergErlangenFederal Republic of Germany

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