Heat Conduction of Lennard-Jones Particle System in Supercritical Fluid Phase(General)

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概要

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• 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 L_x×L_y×L_z dimensions. Two Nose-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 L_x. It is confirmed that κ(L_x) shows a size dependence as expressed κ_0+a/√<L_x> and this dependence is consistent with the so-called long-time tail behavior. This κ_0 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(L_x) of the L_x=300 system decreases by about 10% from that of the macroscopic system. The estimated κ_0 turns out to be proportional to the density.

• 社団法人日本物理学会の論文
• 2005-03-15

著者

• YUKAWA Satoshi

  Department of Earth and Space Science, Osaka University

• ITO Nobuyasu

  Department of Applied Physics, The University of Tokyo

• OGUSHI Fumiko

  Department of Physics and Electronics, Osaka Prefecture University

• Ito Nobuyasu

  Department Of Applied Physics The University Of Tokyo

• Ito Nobuyasu

  Department Of Applied Physics Faculty Of Engineering The University Of Tokyo

• Ogushi Fumiko

  The Theoretical Biochemistry Laboratory Riken Advanced Science Institute

• Ogushi Fumiko

  Department Of Applied Physics School Of Engineering The University Of Tokyo

• Yukawa S

  Department Of Applied Physics University Of Tokyo

• Yukawa Satoshi

  Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo:department Of E

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