Spatiotemporally resolved imaging of streamer discharges in air generated in a wire-cylinder reactor with (sub)nanosecond voltage pulses

Abstract

• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Huiskamp, T., Sengers, W., Beckers, F. J. C. M., Nijdam, S., Ebert, U. M., van Heesch, E. J. M., & Pemen, A. J. M. (2017). Spatiotemporally resolved imaging of streamer discharges in air generated in a wire-cylinder reactor with (sub)nanosecond voltage pulses. Plasma Sources Science and Technology, 26(7), 075009. DOI: 10.1088/1361-6595/aa7587General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract. We use (sub)nanosecond high-voltage pulses to generate streamers in atmospheric-pressure air in a wire-cylinder reactor. We study the effect of reactor length, pulse duration, pulse amplitude, pulse polarity, and pulse rise time on the streamer development, specifically on the streamer distribution in the reactor to relate it to plasma-processing results. We use ICCD imaging with a fully automated setup that can image the streamers in the entire corona-plasma reactor. From the images, we calculate streamer lengths and velocities. We also develop a circuit simulation model of the reactor to support the analysis of the streamer development. The results show how the propagation of the high-voltage pulse through the reactor determines the streamer development. As the pulse travels through the reactor, it generates streamers and attenuates and disperses. At the end of the reactor, it reflects and adds to itself. The local voltage on the wire together with the voltage rise time determine the streamer velocities, and the pulse duration the consequent maximal streamer length.Spatiotemporally resolved imaging of streamer discharges in air generated in a wire-cylinder reactor with (sub

(Sub)nanosecond transient plasma for atmospheric plasma processing experiments: application to ozone generation and NO removal

“…We know from our imaging experiments with the nanosecond pulse source [62] that the streamer velocity is higher for a higher applied voltage due to an increased enhanced electric field at the streamer head. This streamer head generates radicals needed for the ozone production, so as long as the streamer propagates, a higher voltage can increase the radical production.…”

“…We know from our imaging experiments that the streamers in our corona-plasma reactor are mainly primary streamers [62]. Only somewhere in the range ∆t = 6-9 ns streamers start to cross the gap from the high-voltage wire to the grounded outer cylinder at some points in the reactor at applied voltages of 25 kV and higher (an example, including streamer crossing, is shown in Fig.…”

“…In [50] we found that applying negative pulses resulted in a higher energy transfer (or better "matching") of the pulse source to the reactor than when we use positive pulses, but that the associated ozone yield was lower. In [62] we then discovered the presence of thick streamers on the tightening mechanism of the reactor that likely dissipate a significant amount of energy (shown at the top of the images in Fig. 8).…”

“…(Sub)nanosecond transient plasma for atmospheric plasma processing experiments: application to ozone gene From the results in [62] we know that we have no visible secondary-streamer phase when the streamers have crossed the gap, but there will likely be secondary effects such as the onset of secondary streamers that are not visible in the ICCD-imaging or the heating of the streamer channel. Therefore, when the streamer volume stops increasing, secondary-streamer effects could increase.…”

Behavioral Characteristics of Nanosecond Pulsed Discharge in Coaxial Electrodes

“…To date, there have been many studies on the discharge electrode parameters of coaxial cylindrical electrodes that are used as discharge reactors for general gas processing and also as nanosecond pulsed discharge reactors. [25][26][27][28][29][30] In particular, it has been reported that the internal wire electrode diameter significantly affects the electric field strength near the electrode, and is an extremely important factor in the formation and propagation of streamer discharges. 31 Therefore, elucidating the characteristics of nanosecond pulsed discharge when varying the inner electrode diameter will enable the formation of a discharge suitable for a given use, that is, will enable the formation of a nanosecond pulsed discharge with selectivity.…”