Spatially resolved ozone densities and gas temperatures in a time modulated RF driven atmospheric pressure plasma jet: An analysis of the production and destruction mechanisms

Shiqiang Zhang, Wouter Van Gaens, Bram Van Gessel, Sven Hofmann, Eddie Van Veldhuizen, Annemie Bogaerts, Peter Bruggeman

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Abstract

In this work, a time modulated RF driven DBD-like atmospheric pressure plasma jet in Ar + 2%O2, operating at a time averaged power of 6.5 W is investigated. Spatially resolved ozone densities and gas temperatures are obtained by UV absorption and Rayleigh scattering, respectively. Significant gas heating in the core of the plasma up to 700 K is found and at the position of this increased gas temperature a depletion of the ozone density is found. The production and destruction reactions of O3 in the jet effluent as a function of the distance from the nozzle are obtained from a zero-dimensional chemical kinetics model in plug flow mode which considers relevant air chemistry due to air entrainment in the jet fluent. A comparison of the measurements and the models show that the depletion of O3 in the core of the plasma is mainly caused by an enhanced destruction of O3 due to a large atomic oxygen density.

Original languageEnglish (US)
Article number205202
JournalJournal of Physics D: Applied Physics
Volume46
Issue number20
DOIs
StatePublished - May 22 2013

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