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Development of ac corona discharge modes at atmospheric pressure
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10.1063/1.3553455
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Affiliations:
1 Department of Physics, Faculty of Science, Assiut University, 71516 Assiut, Egypt
a) Author to whom correspondence should be addressed. Tel.: +2 011 090 2162. Electronic mail: elkoramy@yahoo.com.
Phys. Plasmas 18, 023502 (2011)
/content/aip/journal/pop/18/2/10.1063/1.3553455
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View: Figures

## Figures

FIG. 1.

Schematic diagram of wire-duct reactor. The reactor has internal dimensions of 20 cm length, 7.5 cm width, and 5 cm length. Its walls are made from a transparent Perspex sheet of 5 mm thickness. The plate to plate spacing of the duct is variable up to 5 cm and the discharge wire is tensioned midway between the plates.

FIG. 2.

Current-voltage characteristics of ac coronas generated in the wire-duct reactor had (a) constant gap spacing and constant wire radius for different gases. The graphs show how the characteristics are influenced by the type of the flowing gas inside the reactor under the same discharge conditions; (b) constant wire radius for different gap spacing in . The graphs show that ac discharge corona current increases as the gap spacing decreases at the same applied voltage whatever the discharge conditions; and (c) constant gap spacing for different radii of the discharge wire in . The graphs show stability of the ac discharge current values of the investigated gas at higher applied ac voltages.

FIG. 3.

Successive current-voltage oscillograms generated in an air-fed wire-duct reactor stressed by ac voltage ( and ). (a) The discharge starts with the form of onset streamers in both positive and negative half-cycles; (b) the onset streamers disappear gradually and followed by stable glow mode; [(c) and (d)] the streamers are superimposed on a steady negative current in the negative voltage half-cycles.

FIG. 4.

Successive current-voltage oscillograms generated in oxygen-fed wire-duct reactor stressed by ac voltage ( and ). (a) The discharge starts with the form of onset streamers in both positive and negative half-cycles; [(b) and (c)] the onset streamers exist only in the positive half-cycles; (d) the streamers are superimposed on a steady discharge current in both positive and negative in half-cycles.

FIG. 5.

Successive current-voltage oscillograms generated in an argon-fed wire-duct reactor stressed by ac voltage ( and ). When the ac applied voltage is increased to the onset of the corona discharge, repetitive pulses are observed in both positive and negative half-cycles.

FIG. 6.

Successive current-voltage oscillograms generated in helium-fed wire-duct reactor stressed by ac voltage ( and ). As the ac applied voltage is increased to the corona onset voltage, the pulsed mode is observed in both positive and negative half-cycles.

FIG. 7.

Photomicrographs showing the ac corona glow modes recorded around the discharge wire in: (I) air, (II) , (III) , (IV) Ar, and (V) He gas fed wire-duct reactor ( and ). The corona plasma is simply a combination of the modes that appear with the positive and negative dc coronas (Ref. 9). The glow starts at the onset voltage as small spots with faint glows separating them along the discharge wire. At higher currents, the glow appears almost uniform around the discharge wire mixing with small spots.

/content/aip/journal/pop/18/2/10.1063/1.3553455
2011-02-09
2014-04-16

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