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Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor

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posted on 05.02.2019, 12:01 by Paolo Seri, Alexander R.P. Wright, Alex Shaw, Felipe Iza, Hemaka Bandulasena, Carlo A. Borghi, Gabriele Neretti
In this study we examine both the effect of changing the applied voltage waveform shape and the modulation on-time on the amount of ozone dissolved within a liquid in a DBD bubble reactor. In this device, the discharge forms at the gas liquid interface allowing for effective transfer of the plasma effluent into the liquid. To produce different voltage waveforms, a multilevel inverter power supply capable of generating arbitrary waveforms without switching-on and switching-off transients has been used. Of the four waveforms used in the study (sinusoidal, sawtooth, square and short-pulse), the square waveform was found to be the most efficient at producing the highest ozone concentration for a fixed peak voltage and average power. To determine the effect of the modulation on-time, the number of cycles during the on-time were increased from 1 up to 1000, adjusting the off-time accordingly to maintain the same duty cycle. Shorter on-time periods were found to be more efficient. Experimental and computational results indicate that the time between subsequent discharges is critical for increased ozone generation efficacy, as this needs to be long enough for ozone produced in one discharge event to diffuse away from the discharge region before the next discharge event occurs, thereby avoiding its partial destruction in the plasma. This insight provides a valuable criterion for the optimization of DBD reactors used in novel biomedical, agricultural and environmental applications.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Plasma Sources Science and Technology

Citation

SERI, P. ... et al, 2019. Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor. Plasma Sources Science and Technology, 28 (3), 035001.

Publisher

© IOP Publishing

Version

AM (Accepted Manuscript)

Publisher statement

This is the Accepted Manuscript version of an article accepted for publication in Plasma Sources Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6595/ab024f.

Acceptance date

28/01/2019

Publication date

2019-03-07

ISSN

0963-0252

eISSN

1361-6595

Language

en

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