Acoustic waves in plasma

Galechyan, G. A.

doi:10.3367/ufnr.0165.199512b.1357

Cited by 21 publications

(5 citation statements)

References 3 publications

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“…It is sometimes asserted in the literature [10] that the amplification coefficient is independent of pressure. Therefore, we investigated the dependences of β on P c (Fig.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

“…According to Ingard et al [1][2][3][4][5], the inclusion of, for example, the transfer of energy from electrons to colder neutrals may bring about an amplification of sound waves (acoustic instability). The theoretical prediction of the development of acoustic instability [1][2][3][4][5] in weakly ionized plasma was supported by numerous experimental investigations [6][7][8][9][10] in which the amplification of sound waves was observed in ordinary laboratory dc glowdischarge plasma at a gas pressure higher than 1 torr. Note, however, that the experimental results in the amplification of sound in gas-discharge plasma cannot be explained using the theory of Ingard et al Indeed, one can readily check that the criterion of sound amplification obtained, for example, in [2] is not valid for the values of parameters of plasma and frequency of sound waves that correspond to the experimental investigations in which the amplification of sound waves was observed.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Instability in Inhomogeneous Gas-Discharge Plasma

2005

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The possibility of amplification of acoustic waves in inhomogeneous atomic dc gas-discharge plasma (positive column of glow discharge) is investigated theoretically. This amplification is caused by the transfer of thermal energy from electrons to colder electron gas under conditions of elastic electron-atom collisions. It is demonstrated that the inclusion of nonuniform distribution of equilibrium temperature, neutral gas concentration, and electron concentration over the plasma column cross section, similar to the case of uniform distribution, cannot result in acoustic instability and, consequently, in the interpretation of the experimental results in sound amplification in weakly ionized plasma. The dispersion equation for sound waves in inhomogeneous glow-discharge plasma is derived and numerically analyzed in detail. Comparison of the theoretical and experimental results enables one to identify the reasons for their discrepancy and to actually reveal the basic principles essential for constructing a theory which will make it possible to quantitatively and adequately describe the experimental data on the amplification of sound in weakly ionized atomic plasma.

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“…It is sometimes asserted in the literature [10] that the amplification coefficient is independent of pressure. Therefore, we investigated the dependences of β on P c (Fig.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Acoustic Instability in Inhomogeneous Gas-Discharge Plasma

2005

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“…It is known that an amplification of acoustic waves is observed in acoustically active media (partially ionized gas, vibrationally excited gas, chemically active mixtures, gas suspensions with different temperatures of components, and so on) [1][2][3][4]. The conditions of emergence of acoustic instability, the mechanisms of stabilization of instability, and accompanying effects were analyzed in considerable detail [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Resonant interaction of acoustic waves in nonequilibrium gases

Zavershinskii

Kogan

2006

High Temp

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Nonlinear equations are derived, which describe the evolution of two-dimensional acoustic disturbances in a thermodynamically nonequilibrium gas. The characteristic features of parametric interaction of wave packets in acoustically active media are analyzed. The transmission band under conditions of critical and noncritical matching and the threshold of parametric amplification are determined. Conditions are obtained, under which a giant parametric pulse may form in an acoustically active medium, with the amplitude of this pulse exceeding that of a pumping wave.

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“…Alexeff and Neidigh [1], Ishii and Inuishi [2], Fitaire and Mantei [3], Hasegawa [4], Galechyan and Mcrtchyan [5], Alexandrov et al [6] have observed amplification of the sound waves in glow and radio frequency discharges in inert gases. Shields [7], Galechyan [8], Galechyan and Mkrtchyan [9] extended the investigations to a nonequilibrium molecular (nitrogen, air) plasma. The sound amplification is followed by the intensive small-scale vortex flow generation in discharge tubes.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermodynamic Nonequilibrium on the Acoustic Properties of Gases

Molevich

Климов

Makaryan

2005

International Journal of Aeroacoustics

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This paper is a brief review of results of experimental and theoretical studies in the field of acoustics of nonequilibrium gas-plasma media. New acoustical properties of nonequilibrium media caused by the change in sign of the second viscosity and the dispersion coefficients are considered. Such media are acoustically active. Conditions are discussed for generating new nonlinear acoustical structures.

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Acoustic waves in plasma

Cited by 21 publications

References 3 publications

Acoustic Instability in Inhomogeneous Gas-Discharge Plasma

Acoustic Instability in Inhomogeneous Gas-Discharge Plasma

Resonant interaction of acoustic waves in nonequilibrium gases

Influence of Thermodynamic Nonequilibrium on the Acoustic Properties of Gases

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