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Influence of the On-time on the Ozone Production in Pulsed Dielectric Barrier Discharges

1
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
2
Department of Chemical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
3
Department of Electrical, Electronic and Information Engineering, University of Bologna, Bologna 40136, Italy
*
Author to whom correspondence should be addressed.
The authors have contributed equally.
Plasma 2019, 2(1), 39-50; https://doi.org/10.3390/plasma2010005
Received: 12 January 2019 / Revised: 22 February 2019 / Accepted: 25 February 2019 / Published: 4 March 2019
(This article belongs to the Special Issue Latest Developments in Pulsed Low-Temperature Plasmas)
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Abstract

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. View Full-Text
Keywords: on-time; duty-cycle; modulation; ozone; DBD on-time; duty-cycle; modulation; ozone; DBD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Montazersadgh, F.; Wright, A.; Ren, J.; Shaw, A.; Neretti, G.; Bandulasena, H.; Iza, F. Influence of the On-time on the Ozone Production in Pulsed Dielectric Barrier Discharges. Plasma 2019, 2, 39-50.

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