Interaction of positive streamers in air with bubbles floating on liquid surfaces: conductive and dielectric bubbles

Babaeva, Natalia Yu; Naidis, G. V.; Kushner, Mark J.

doi:10.1088/1361-6595/aaa5da

Cited by 15 publications

(13 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A drift-diffusion-reaction model for charge transport was used. Such models are widely used for streamer simulation in air [6,18,[42][43][44][45][46]. A Helmholtz-based radiative transfer model was used to model photoionisation and photoemission.…”

Section: Computer Simulationsmentioning

confidence: 99%

Streamer propagation along a profiled dielectric surface

Meyer

Marskar

Gjemdal

et al. 2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

We investigate the propagation of positive streamers along a profiled dielectric surface in air at atmospheric pressure. Results from experiments and two-dimensional planar low-temperature plasma fluid simulations are presented and analysed. The test object consists of a disk-shaped high voltage electrode and a dielectric slab with 0.5 mm deep corrugations. The corrugated surface has a 47% larger surface area than the smooth reference surface. The experiments and simulations are performed at voltage levels that lead to either gap-bridging or arrested streamers. In both experiments and simulations, the streamers take a longer time to reach the ground electrode when propagating along the profiled surface than along the smooth reference surface. Also, arrested streamers stop closer to the high voltage electrode when a profiled surface is used. Streamers propagate closely along the surface profile in the simulations, which suggests that the observed surface profile effect is mainly a result of elongated streamer channels. Compared to the streamers propagating along the smooth surface, the elongated streamers on the profiled surface have less residual voltage at the streamer front to drive the streamer advancement.

show abstract

Section: Computer Simulationsmentioning

confidence: 99%

Streamer propagation along a profiled dielectric surface

Meyer

Marskar

Gjemdal

et al. 2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Plasma catalysis can be realized by introducing dielectric packing beads (coated with catalyst material) in the discharge gap, forming a packed bed dielectric barrier discharge (PB-DBD) reactor. The DBD generally occurs in a filamentary mode by applying a high driving voltage [10][11][12][13][14], which induces a very fast ionization avalanche, propagating from powered electrode to grounded electrode, i.e., a so-called streamer [12,13,[15][16][17][18][19]. Each streamer starts when the driving voltage passes a certain threshold, and will further polarize the dielectric surface [20].…”

Section: Introductionmentioning

confidence: 99%

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

et al. 2018

View full text Add to dashboard Cite

Abstract:We investigated the mode transition from volume to surface discharge in a packed bed dielectric barrier discharge reactor by a two-dimensional particle-in-cell/Monte Carlo collision method. The calculations are performed at atmospheric pressure for various driving voltages and for gas mixtures with different N 2 and O 2 compositions. Our results reveal that both a change of the driving voltage and gas mixture can induce mode transition. Upon increasing voltage, a mode transition from hybrid (volume+surface) discharge to pure surface discharge occurs, because the charged species can escape much more easily to the beads and charge the bead surface due to the strong electric field at high driving voltage. This significant surface charging will further enhance the tangential component of the electric field along the dielectric bead surface, yielding surface ionization waves (SIWs). The SIWs will give rise to a high concentration of reactive species on the surface, and thus possibly enhance the surface activity of the beads, which might be of interest for plasma catalysis. Indeed, electron impact excitation and ionization mainly take place near the bead surface. In addition, the propagation speed of SIWs becomes faster with increasing N 2 content in the gas mixture, and slower with increasing O 2 content, due to the loss of electrons by attachment to O 2 molecules. Indeed, the negative O − 2 ion density produced by electron impact attachment is much higher than the electron and positive O + 2 ion density. The different ionization rates between N 2 and O 2 gases will create different amounts of electrons and ions on the dielectric bead surface, which might also have effects in plasma catalysis.

show abstract

“…There are two reasons why the gas-liquid interface constrains the ionization wave or charges. On the one hand, the gasliquid interface is a curved surface to enhance the local electric field, which is mentioned in many simulation references [26,31,32]. The same phenomenon has been simulated in [22].…”

Section: Discussionmentioning

confidence: 88%

Discharge characteristics of pin-micron droplet-pin system driven by DC pulse voltage

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The multi-phase discharge with the gas-liquid interface has attracted a lot of interest and especially the plasma biomedicine application has become the research hotpot in recent years. Considering the size effect of the gas and liquid phases, this paper focuses on the discharge processes based on the micron droplet system with a pin-to-pin electrode excited by the high DC pulse voltage with 30 ns rising time. The main innovation of this article is the droplet diameters varying from 300 μm to 600 μm. The image shows that the discharge always develops along the surface of the droplet, and the droplet appears to have the effect of guiding the ionizing wave. And the discharge affects the shape of the droplet. When the applied voltage (UA) is different, the difference between with droplet and without droplet inside the electrodes shows reverse characteristics. When UA is 10 kV, the emission duration time and area of the without droplet case is larger than that with the droplet while the result is the opposite for when UA is 40 kV. There is a pre-breakdown channel before the ellipsoidal discharge and the pre-breakdown channel is related to the electrode-droplet position. And the pre-breakdown channel always propagates along the droplet surface.

show abstract

Interaction of positive streamers in air with bubbles floating on liquid surfaces: conductive and dielectric bubbles

Cited by 15 publications

References 43 publications

Streamer propagation along a profiled dielectric surface

Streamer propagation along a profiled dielectric surface

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

Discharge characteristics of pin-micron droplet-pin system driven by DC pulse voltage

Contact Info

Product

Resources

About