Transport properties of highly asymmetric hard-sphere mixtures

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The static and dynamic properties of binary mixtures of hard spheres with a diameter ratio of sigma(B)/sigma(A)= 0.1 and a mass ratio of m(B)/m(A)= 0.001 are investigated using event driven molecular dynamics. The contact values of the pair correlation functions are found to compare favorably with recently proposed theoretical expressions. The transport coefficients of the mixture, determined from simulation, are compared to the predictions of the revised Enskog theory using both a third-order Sonine expansion and direct simulation Monte Carlo. Overall, the Enskog theory provides a fairly good description of the simulation data, with the exception of systems at the smallest mole fraction of larger spheres (x(A)=0.01) examined. A "fines effect" was observed at higher packing fractions, where adding smaller spheres to a system of large spheres decreases the viscosity of the mixture; this effect is not captured by the Enskog theory.

Original languageEnglish
Article number164507
Number of pages9
JournalThe Journal of Chemical Physics
Volume130
Issue number16
DOIs
Publication statusPublished - 23 Apr 2009

Keywords

  • radial-distribution functions
  • molecular-dynamics simulations
  • diameter ratio 0.4
  • multicomponent mixtures
  • Enskog theory
  • thermal-diffusion
  • binary-mixtures
  • dense gases
  • equation
  • state

Cite this