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Influence of the on-time on the ozone production in pulsed dielectric barrier discharges

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posted on 21.03.2019 by Faraz Montazersadgh, Alexander R.P. Wright, Junchen Ren, Alexander H. Shaw, Gabriele Neretti, Hemaka Bandulasena, Felipe Iza
Understanding the production mechanisms of ozone and other reactive species in atmospheric pressure dielectric barrier discharges (DBDs) has become increasingly important for the optimization and commercial success of these plasma devices in emerging applications, such as plasma medicine, plasma agriculture, and plasma catalysis. In many of these applications, input power modulation is exploited as a means to maintain a low gas temperature. Although the chemical pathways leading to ozone production/destruction and their strong temperature dependence are relatively well understood, the effect of the on-time duration on the performance of these modulated DBDs remains largely unexplored. In this study, we use electrical and optical diagnostics, as well as computational methods, to assess the performance of a modulated DBD device. The well-established Lissajous method for measuring the power delivered to the discharge is not suitable for modulated DBDs because the transients generated at the beginning of each pulse become increasingly important in short on-time modulated plasmas. It is shown that for the same input power and modulation duty-cycle, shorter on-time pulses result in significantly enhanced ozone production, despite their operation at slightly higher temperatures. The key underpinning mechanism that causes this counter-intuitive observation is the more efficient net generation rate of ozone during the plasma on-time due to the lower accumulation of NO2 in the discharge volume.

Funding

A.W. would like to thank EPSRC (EP/M507908/1) for the studentship. A.W. & H.B. would like to thank Plants to Products BBSRC NIBB for funding (POC-HD_RD0300 C and BB/L013819/1).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Plasma

Volume

2

Issue

1

Pages

39 - 50

Citation

MONTAZERSADGH, F. ... et al., 2019. Influence of the on-time on the ozone production in pulsed dielectric barrier discharges. Plasma, 2(1), pp. 39 - 50.

Publisher

© The Authors. Published by MDPI AG

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VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

25/02/2019

Publication date

2019-03-04

Notes

This is an Open Access Article. It is published by MDPI under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

eISSN

2571-6182

Language

en

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