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The influence of vibrational state-resolved transport coefficients on the wave propagation in diatomic gases

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  • Kremer, Gilberto M.
  • Kunova, Olga V.
  • Kustova, Elena V.
  • Oblapenko, George P.

Abstract

A detailed kinetic-theory model for the vibrationally state-resolved transport coefficients is developed taking into account the dependence of the collision cross section on the size of vibrationally excited molecule. Algorithms for the calculation of shear and bulk viscosity, thermal conductivity, thermal diffusion and diffusion coefficients for vibrational states are proposed. The transport coefficients are evaluated for single-component diatomic gases N2, O2, NO, H2, Cl2 in the wide range of temperature, and the effects of molecular diameters and the number of accounted states are discussed. The developed model is applied to study wave propagation in diatomic gases. For the case of initial Boltzmann distribution, the influence of vibrational excitation on the phase velocity and attenuation coefficient is found to be weak. We expect more significant effect in the case of initial thermal non-equilibrium, for instance in gases with optically pumped selected vibrational states.

Suggested Citation

  • Kremer, Gilberto M. & Kunova, Olga V. & Kustova, Elena V. & Oblapenko, George P., 2018. "The influence of vibrational state-resolved transport coefficients on the wave propagation in diatomic gases," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 490(C), pages 92-113.
    • Handle: RePEc:eee:phsmap:v:490:y:2018:i:c:p:92-113
    DOI: 10.1016/j.physa.2017.08.019
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    1. Gorbachev, Yuriy E. & Gordillo-Vázquez, Francisco J. & Kunc, Joseph A., 1997. "Diameters of rotationally and vibrationally excited diatomic molecules," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 247(1), pages 108-120.
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    1. Oblapenko, G. & Kustova, E.V., 2020. "Influence of angular momentum on transport coefficients in rarefied gases," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 553(C).

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