Journal of Statistical Physics

, Volume 48, Issue 3–4, pp 873–900 | Cite as

Hard-sphere heat conductivity via nonequilibrium molecular dynamics

  • Karl W. Kratky
  • William G. Hoover
Articles

Abstract

We use an Evans-Gillan driving forceFd, together with isokinetic and isoenergetic constraint forcesFc, to drive steady heat currents in periodic systems of 4 and 32 hard spheres. The additional driving and constraint forces produce curved trajectories as well as additional streaming and collisional contributions to the momentum and energy fluxes. Here we develop an analytic treatment of the collisions so that the simulation becomes approximately ten times faster than our previous numerical treatment. At low field strengthsλ, forλσ less than 0.4, whereσ is the hard-sphere diameter, the 32-sphere conductivity is consistent with Alder, Gass, and Wainwright's 108-sphere value. At higher field strengths the conductivity varies roughly asλ1/2, in parallel with the logarithmic dependence found previously for three hard disks.

Key words

Nonequilibrium molecular dynamics heat conductivity hard spheres 

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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • Karl W. Kratky
    • 1
  • William G. Hoover
    • 2
  1. 1.Institut für ExperimentalphysikUniversität WienWienAustria
  2. 2.Department of Applied ScienceUniversity of California at Davis, and Lawrence Livermore National LaboratoryLivermore

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