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Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2014

Time-resolved imaging of nanosecond-pulsed micro-discharges in heptane

A. Hamdan
  • Fonction : Auteur
Thierry Belmonte
A. Rousseau

Résumé

Nanosecond-pulsed micro-discharges in heptane are studied by time-resolved imaging in pin-to-plate configuration. When a voltage of +5 kV is applied to the pin electrode, the discharge exhibits one maximum in light intensity. At +15 kV, filtered images show that up to three maxima can be identified. These maxima are associated with local electron-ion recombination and bremsstrahlung emission and attributed to the development of a complex space-charge field. In the post-discharge, the dynamics of the gas bubble can be simulated by the Gilmore model, and the pressure evolution in this bubble is predicted. From our results, it seems reasonable to think that the gas bubble develops from the post-discharge of the spark. Results obtained by using the double-pulse technique show that light emission during the post-discharge of the second discharge lasts 10 times longer than the post-discharge of the first spark. The pressure drop in the gas bubble, predicted by the Gilmore model, is used to explain this result and it provides a control method by optical diagnostics in liquids.
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Dates et versions

hal-01285334 , version 1 (09-03-2016)

Identifiants

Citer

A. Hamdan, Ilya Marinov, Thierry Belmonte, A. Rousseau. Time-resolved imaging of nanosecond-pulsed micro-discharges in heptane. Journal of Physics D: Applied Physics, 2014, 47 (5), ⟨10.1088/0022-3727/47/5/055203⟩. ⟨hal-01285334⟩
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