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Fluid Dynamics

, Volume 11, Issue 5, pp 791–794 | Cite as

Propagation of small disturbances in a relaxing and radiating diatomic gas in vibrational nonequilibrium

  • L. V. Katkovskii
Article
  • 13 Downloads

Abstract

In radiation gasdynamical problems, where the primary object of investigation is a moving gas, the influence of radiation on the parameters of the gas flow is usually neglected to avoid overcomplication of the problem. The growth and behavior of initial disturbances in a scattering, radiating, absorbing, viscous, heat-conducting gas characterized by local thermodynamic equilibrium has been investigated previously [1]. However, for low pressures (p∼10−4 to 10−3 technical atm) and fairly high temperatures of the active molecular degrees of freedom (T∼103 to 3·103‡K) the distribution of the molecules among the vibrational levels can differ markedly from the equilibrium distribution due to the or der-of-magnitude closeness of the vibrational relaxation time Τc associated with collisions and the radiative deactivation time Τ* of excited molecules [2, 3]. We now analyze normal modes in a vibrationally nonequilibrium medium with allowance for radiation scattering in the vibrational-rotational band. We formulate a dispersion relation and discuss some limiting cases.

Keywords

Dispersion Relation Normal Mode Equilibrium Distribution Vibrational Level Radiation Scattering 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature cited

  1. 1.
    V. A. Prokof'ev, “Evolution of initial disturbances in a scattering, radiating, absorbing, viscousm, heat-conducting gas”, Dokl. Akad. Nauk SSSR,214, No. 6 (1974).Google Scholar
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    M. A. El'yashevich, V. I. Kruglov, and Yu. V. Khodyko, “Derivation of an equation of the Biberman-Holstein type for a nonequilibrium radiating diatomic gas”, Zh. éksp. Teor. Fiz., Pis'ma Red.,20, No. 2 (1974).Google Scholar
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    V. I. Kruglov and Yu. V. Khodyko, “Integral equation for the vibrational energy density of diatomic gases”, Dokl. Akad. Nauk BelorusSSR,19, No. 6 (1975).Google Scholar
  4. 4.
    V. L. Ginzburg and A. A. Rukhadze, Waves in a Magnetoplasma [in Russian], Nauka, Moscow (1975).Google Scholar
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    V. I. Kruglov, “Theory of the vibrationally nonequilibrium radiation of a diatomic gas (Candidate's Dissertation), Minsk (1975).Google Scholar

Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • L. V. Katkovskii
    • 1
  1. 1.Minsk

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