Temporal evolution of temperature and OH density produced by nanosecond repetitively pulsed discharges in water vapour at atmospheric pressure

F. P. Sainct, D. A. Lacoste, M. J. Kirkpatrick, E. Odic, C. O. Laux

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We report on an experimental study of the temporal evolution of OH density and gas temperature in spark discharges created by nanosecond repetitively pulsed discharges in pure water vapour at 475 K and atmospheric pressure. The plasma was generated by 20 kV, 20 ns pulses, at a repetition frequency of 10 kHz. The temperature was measured during the discharge by optical emission spectroscopy of the second positive system of N2, and between two discharges by two-colour OH-planar laser induced fluorescence (OH-PLIF) using two pairs of rotational transitions. Between two successive discharges, the relative density of OH was measured by OH-PLIF and was found to decay very slowly, with a 1/e decay time of about 50 μs. With the use of a chemical kinetics model, the OH density was placed on an absolute scale.

Original languageEnglish (US)
Article number075204
JournalJournal of Physics D: Applied Physics
Volume47
Issue number7
DOIs
StatePublished - Feb 19 2014
Externally publishedYes

Keywords

  • nanosecond spark discharge
  • optical emission spectroscopy
  • quantitative OH-PLIF
  • two-colour PLIF
  • water plasma

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Temporal evolution of temperature and OH density produced by nanosecond repetitively pulsed discharges in water vapour at atmospheric pressure'. Together they form a unique fingerprint.

Cite this