Cylindrical RF discharge with free boundary at atmospheric pressure

Sutton, Y.; Naidis, G. V.; Johnson, P. C.; Moore, J.; Sharp, D. and Braithwaite, N. St.J (2009). Cylindrical RF discharge with free boundary at atmospheric pressure. In: International Conference on Phenomena in Ionized Gases, 17-19 Jul 2009, Cancun Mexico.

URL: http://www.icpig2009.unam.mx/pdf/PB10-8.pdf

Abstract

A non-equilibrium electrical discharge, driven at 325 kHz in atmospheric pressure ambient air can be used as an acoustic source. Electrical and optical data for the unmodulated, free-burning, vertical arc discharge are compared with a fluid model based on the dominant collision processes in nitrogen –oxygen mixtures. For a 15 mm long, 20 mA discharge, observations and the model reveal that the gas temperature is ~3000 K, the axial field is ~100 kV m-1 and the electron density is ~ 2  1017 m–3; the column radius is ~1 mm in terms of optical emission, but the gas temperature width is about three times broader

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