Temperature as a mechanism for the buildup of successive streamers in low-voltage breakdown

Geary, John M.; Penney, G. W.

doi:10.1063/1.1662946

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…This density change leads to an increase of the reduced electric field E/N and thus to an increase of the ionisation and transport mechanisms reinforced in the case of recurring discharges. This result agrees with the remarks of Geary and Penney (1974) about the role of a thermal disturbance of neutral particles on the behaviour of recurring discharges. In our computations, the density perturbation continues for about 100 ps (50 to 100 p ) .…”

Section: Propagation and Structure Of The Blast Wavesupporting

confidence: 92%

Blast wave propagation in glow to spark transition in air

Bayle

Forn

1985

J. Phys. D: Appl. Phys.

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The formation and propagation of post-discharge blast waves are studied theoretically and the minimum rate of energy transfer between electrons and neutral particles is deduced in the case of a positive point-to-plane discharge in air, described and numerically analysed in a previous paper by the authors. In this type of discharge, the injection of energy in the discharge is spread in time. The blast waves generated by the discharge constitute a set of waves with a complex structure. They first propagate separately, then merge in a single wave. The core of the discharge remains perturbed for a long time (i.e. low neutral densities and high temperatures) after the discharge crossing and thus constitutes a privileged path for possible recurring discharges. The classical analysis of blast waves was adapted to the experimental situation in which the energy injection is spread in time and space. The influence of the injected energy on the expansion radius of the wave has been studied and the authors show that the minimum rate of energy transfer fmin between electrons and neutral particles in the glow to spark transition can be deduced from the Schlieren records. In the experiments analysed, the rate of energy transfer f is greater than 20+or-6%.

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Section: Propagation and Structure Of The Blast Wavesupporting

confidence: 92%

Blast wave propagation in glow to spark transition in air

Bayle

Forn

1985

J. Phys. D: Appl. Phys.

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“…This means that the fast heating processes will not have any significant effect on a subsequent streamer in our case. It is clear that this result is much lower than the calculation from [17], in which the successive streamers finally lead to a spark. In that situation, fast heating is an important contributor to succeeding discharges, but it is very different from our experimental conditions with only two pulses short after each other.…”

Section: Electrical Parameters Analysismentioning

confidence: 58%

“…We measured the average diameter of streamer channels in 100 mbar air as 3 mm with 80 mm propagation distance (halfway of the 160 mm electrode gap). Assuming that there are 5 branching channels for each streamer discharge and 30% of the discharge energy is converted to fast heating in 100 mbar air (the density of 1 bar air at room temperature being 1.2 g l −1 ; the specific heat of air being 1.0 J g −1 K −1 ) [17]. Therefore, we can estimate the temperature in the streamer branches will be elevated by less than 1 K in our experimental conditions.…”

Section: Electrical Parameters Analysismentioning

confidence: 97%

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Positive double-pulse streamers: how pulse-to-pulse delay influences initiation and propagation of subsequent discharges

Veldhuizen

Zhang

et al. 2018

Plasma Sources Sci. Technol.

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Residual charges and species created by previous streamers have a great impact on the characteristics of the next discharge. This is especially pronounced in repetitively pulsed discharges, where the physical and chemical reactions during the decay phase play a very important role. We have performed double-pulse streamer experiments in artificial air and pure nitrogen with a varying pulse delay (Δt) from 0.45 μs to 20 ms. We have observed morphological transformations of the 2nd-pulse streamer as a function of Δt and classified six typical stages by streamer length. The propagation distance of the 2nd-pulse streamer can be 66% longer than the 1st-pulse in 66.7 mbar nitrogen, while it is 37% longer in air under the same conditions. However, we find that the longer propagation distance of the 2nd-pulse streamer in N 2 is not caused by a higher velocity nor by fast gas heating of previous channels under our experimental conditions, but by earlier inception which gives more time to propagate during the pulse. In air, on the other hand, the streamers initiate almost at the same time in both pulses but the inception cloud of the 2nd-pulse streamer breaks up earlier. The onset of every stage occurs at smaller Δt in air than in N 2 at the same pressure. These observations imply that different mechanisms work in N 2 and air, e.g. photoionization and attachment.

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