Positive streamers in air and nitrogen of varying density: experiments on similarity laws
نویسندگان
چکیده
منابع مشابه
Positive streamers in air and nitrogen of varying density: experiments on similarity laws
Positive streamers in ambient air at pressures from 0.013 to 1 bar are investigated experimentally. The voltage applied to the anode needle ranges from 5 to 45 kV, the discharge gap from 1 to 16 cm. Using a ”slow” voltage rise time of 100 to 180 ns, the streamers are intentionally kept thin. For each pressure p, we find a minimal diameter dmin. To test whether streamers at different pressures a...
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Pictures show that streamer or sprite discharge channels emerging from the same electrode sometimes seem to reconnect or merge though their heads carry electric charge of the same polarity; one might therefore suspect that reconnections are an artefact of the two-dimensional projection in the pictures. Here we use stereo photography to investigate the full three-dimensional structure of such ev...
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Positive and negative streamers are studied in ambient air at 1 bar; they emerge from a needle electrode placed 40 mm above a planar electrode. The amplitudes of the applied voltage pulses range from 5 to 96 kV; most pulses have rise times of 30 ns or shorter. Diameters, velocities and energies of the streamers are measured. Two regimes are identified; a low voltage regime where only positive s...
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The interaction of plasmas sustained in humid air with liquids produces reactive species in both the gas phase and liquid for applications ranging from medicine to agriculture. In several experiments, enhanced liquid reactivity has been produced when the liquid is a foam or a bubble coated liquid. To investigate the phenomena of streamers interacting with bubbles a twodimensional computational ...
متن کاملLaboratory experiments on the interaction of streamers ∗
Pictures show that streamer or sprite discharge channels emerging from the same electrode or position sometimes seem to reconnect or merge even though their heads carry electric charge of the same polarity; one might therefore suspect that reconnections are an artifact of the two-dimensional projection in the pictures. We have used stereo-photography of laboratory scale streamer discharges to i...
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ژورنال
عنوان ژورنال: Journal of Physics D: Applied Physics
سال: 2008
ISSN: 0022-3727,1361-6463
DOI: 10.1088/0022-3727/41/23/234008