Moving Striations in the Argon Positive Column. II. Experiments

A dc argon discharge is operated with gas flowing opposite to the phase velocity of naturally occurring striations. For a range of gas flows, the striations appear stationary in the laboratory frame. Identifying gas velocity with phase velocity and measuring the wavelength determines the striation d...

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Bibliographic Details
Published in:The Physics of fluids (1958) 1966-11, Vol.9 (11), p.2212-2218
Main Author: Gentle, Kenneth W.
Format: Article
Language:English
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Summary:A dc argon discharge is operated with gas flowing opposite to the phase velocity of naturally occurring striations. For a range of gas flows, the striations appear stationary in the laboratory frame. Identifying gas velocity with phase velocity and measuring the wavelength determines the striation dispersion relation in the range of stationarity. Observations were made in a tube of 1‐cm diameter, at 5–20 Torr pressures and 30–300 mA currents. The experimental results for a pressure of 10 Torr are compared with the theoretical calculations. Satisfactory agreement is found, especially considering that large‐amplitude waves are compared with a linear model. Microwave measurements of the electron temperature and density variations in the striations are presented.
ISSN:0031-9171
2163-4998
DOI:10.1063/1.1761590