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Sound waves in a nonequilibrium molecular gas

  • Optics and Spectroscopy
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Abstract

We consider relaxation processes of dynamics of a nonequilibrium vibrationally excited gas (Tv>T0). It is shown that the effective heat capacities can become negative in such a medium. This leads to anomalous effects during propagation of long-wave sound: there exist regions (in the parameter Tv/T0) of sharp enhancement and reduction of its speed, as well as regions where low-frequency sound can generally not propagate. Instability conditions are investigated for various temperature dependences of vibrational relaxation times. It is shown that in a certain region of Tv/T0 values one has amplification of sound waves, related to the formation of second viscosity in these media. In this case a change in the amount of medium nonequilibrium can vary the sound frequency corresponding to maximum amplification.

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Authors and Affiliations

  1. V. V. Kuibyshev Pedagogical Institute, USSR

    E. Ya. Kogan & N. E. Molevich

Authors
  1. E. Ya. Kogan
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  2. N. E. Molevich
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 53–58, July, 1986.

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Kogan, E.Y., Molevich, N.E. Sound waves in a nonequilibrium molecular gas. Soviet Physics Journal 29, 547–551 (1986). https://doi.org/10.1007/BF00895501

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  • DOI: https://doi.org/10.1007/BF00895501

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