Heat conduction of lennard-jones particle system in supercritical fluid phase

Fumiko Ogushi, Satoshi Yukawa, Nobuyasu Ito

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    18 Citations (Scopus)

    Abstract

    The heat conduction of the three-dimensional Lennard-Jones particle system is studied using nonequilibrium molecular dynamics simulation. The geometry of the system is a rectangular parallelepiped box of Lx x Ly x Lz dimensions. Two Nosé-Hoover heat baths with different temperatures are attached to the regions near both ends of the x-direction. The density of the system and temperature of heat bath are selected so that the system is in the supercritical fluid phase. It is observed that the nonequilibrium steady state with a constant temperature gradient dT/dx and a energy (heat) flux J is realized after relaxation process from its initial configuration. The ratio of J to dT/dx denoted by κ which corresponds to the heat conductivity in the macroscopic limit is estimated for various system sizes Lx. It is confirmed that κ(Lx) shows a size dependence as expressed κ0 + a/ √Lx and this dependence is consistent with the so-called long-time tail behavior. This κ0 is regarded as the macroscopic conductivity. This L x dependence implies that the heat conductivity κ(L x) is low for a nanoscale system. The κ(Lx) of the Lx = 300 system decreases by about 10% from that of the macroscopic system.The estimated κ0 turns out to be proportional to the density.

    Original languageEnglish
    Pages (from-to)827-830
    Number of pages4
    Journaljournal of the physical society of japan
    Volume74
    Issue number3
    DOIs
    Publication statusPublished - 2005 Mar 1

    Keywords

    • Heat conduction
    • Lennard-jones
    • Nanoscale transport
    • Nonequilibrium simulation
    • Supercritical fluid
    • Transport phenomena

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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