Abstract
From the experimental investigation of sound propagation in a gaseous discharge, it is established that, in a stationary diffusive discharge in nitrogen, sound amplification takes place according to the linear theory, whereas a sharp transverse constriction of the discharge leads to a sharp, jump-like increase in the amplification factor because of the steep dependence of the relaxation constant of a vibrationally excited molecule on the gas temperature. This result agrees well with the nonlinear theory of sound amplification in a nonequilibrium molecular gas. It is shown that the introduction of oxygen in the nitrogen discharge leads to an increase in the sound amplification factor in the plasma, because the constant of the vibrational relaxation of an excited nitrogen molecule by oxygen is two orders of magnitude greater than the constant of relaxation of nitrogen by nitrogen.
| Original language | English |
|---|---|
| Pages (from-to) | 268-272 |
| Number of pages | 5 |
| Journal | Acoustical Physics |
| Volume | 48 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 May 2002 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Acoustics and Ultrasonics
Cite this
Acoustic wave amplification in a plasma of a molecular gaseous discharge. / Galechyan, G. A.; Mkrtchyan, A. R.
In: Acoustical Physics, Vol. 48, No. 3, 01.05.2002, p. 268-272.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Acoustic wave amplification in a plasma of a molecular gaseous discharge
AU - Galechyan, G. A.
AU - Mkrtchyan, A. R.
PY - 2002/5/1
Y1 - 2002/5/1
N2 - From the experimental investigation of sound propagation in a gaseous discharge, it is established that, in a stationary diffusive discharge in nitrogen, sound amplification takes place according to the linear theory, whereas a sharp transverse constriction of the discharge leads to a sharp, jump-like increase in the amplification factor because of the steep dependence of the relaxation constant of a vibrationally excited molecule on the gas temperature. This result agrees well with the nonlinear theory of sound amplification in a nonequilibrium molecular gas. It is shown that the introduction of oxygen in the nitrogen discharge leads to an increase in the sound amplification factor in the plasma, because the constant of the vibrational relaxation of an excited nitrogen molecule by oxygen is two orders of magnitude greater than the constant of relaxation of nitrogen by nitrogen.
AB - From the experimental investigation of sound propagation in a gaseous discharge, it is established that, in a stationary diffusive discharge in nitrogen, sound amplification takes place according to the linear theory, whereas a sharp transverse constriction of the discharge leads to a sharp, jump-like increase in the amplification factor because of the steep dependence of the relaxation constant of a vibrationally excited molecule on the gas temperature. This result agrees well with the nonlinear theory of sound amplification in a nonequilibrium molecular gas. It is shown that the introduction of oxygen in the nitrogen discharge leads to an increase in the sound amplification factor in the plasma, because the constant of the vibrational relaxation of an excited nitrogen molecule by oxygen is two orders of magnitude greater than the constant of relaxation of nitrogen by nitrogen.
UR - http://www.scopus.com/inward/record.url?scp=0035998122&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035998122&partnerID=8YFLogxK
U2 - 10.1134/1.1478109
DO - 10.1134/1.1478109
M3 - Article
AN - SCOPUS:0035998122
VL - 48
SP - 268
EP - 272
JO - Acoustical Physics
JF - Acoustical Physics
SN - 1063-7710
IS - 3
ER -