Numerical temperature measurement in far from equilibrium model systems

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Abstract

We used a spherical piece of a solid crystal as a thermometer to measure the temperature of far from equilibrium model fluids thermostatted by a numerical feedback mechanism. The thermometer, consisting of 135 or 321 small particles, was devised to behave like one of the fluid particles in order to maintain the homogeneity of the dissipative dynamical system. We found the temperature determined by the random velocities in the close-to-equilibrium thermometer to be substantially different from the kinetic temperature of the studied nonequilibrium molecular dynamics models. We discuss the implications of our results.

Original languageEnglish
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume61
Issue number4 A
Publication statusPublished - Apr 2000

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Thermometer
Equilibrium Model
Temperature Measurement
thermometers
temperature measurement
Dissipative Dynamical System
Non-equilibrium Molecular Dynamics
Fluid
fluids
dynamic models
Homogeneity
dynamical systems
homogeneity
temperature
Dynamic Model
Crystal
Kinetics
molecular dynamics
kinetics
crystals

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability

Cite this

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abstract = "We used a spherical piece of a solid crystal as a thermometer to measure the temperature of far from equilibrium model fluids thermostatted by a numerical feedback mechanism. The thermometer, consisting of 135 or 321 small particles, was devised to behave like one of the fluid particles in order to maintain the homogeneity of the dissipative dynamical system. We found the temperature determined by the random velocities in the close-to-equilibrium thermometer to be substantially different from the kinetic temperature of the studied nonequilibrium molecular dynamics models. We discuss the implications of our results.",
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