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Shear induced anisotropy in two-dimensional liquids

Author

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  • Hanley, H.J.M.
  • Morriss, G.P.
  • Welberry, T.R.
  • Evans, D.J.

Abstract

The behavior of a dense two-dimensional soft disc liquid under shear is studied via nonequilibrium molecular dynamics. The structure factor for the liquid at a given shear rate is evaluated directly by plotting the particle positions, taken at random from the NEMD simulation at that shear, onto photographic film and using light scattering to obtain a diffraction pattern. The pair correlation function of this system is also extracted directly by histogramming the particle positions with respect to a given central particle as a function of separation and angle. The pair correlation function is compared to that approximated by a Fourier series expansion to rank ten. Results are reported as a function of shear rate from a shear rate of 0.1 (when the fluid is essentially Newtonian) to 10 (when the fluid can display a string phase). The appearance of the string phase is discussed and shown to be a consequence of the definition of temperature in the simulation algorithm. A modification of the algorithm is proposed. Comparisons between this work and previous work with three-dimensional liquids are given. The two-dimensional structure factor is compared with that obtained from a real colloidal suspension via light scattering.

Suggested Citation

  • Hanley, H.J.M. & Morriss, G.P. & Welberry, T.R. & Evans, D.J., 1988. "Shear induced anisotropy in two-dimensional liquids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 149(3), pages 406-431.
    • Handle: RePEc:eee:phsmap:v:149:y:1988:i:3:p:406-431
    DOI: 10.1016/0378-4371(88)90113-6
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