Two-dimensional modelling of a nitrogen dielectric barrier discharge (DBD) at atmospheric pressure: filament dynamics with the dielectric barrier on the cathode

Papageorghiou, L.; Panousis, E.; Loiseau, Jason; Spyrou, N.; Held, B.

doi:10.1088/0022-3727/42/10/105201

Cited by 46 publications

(34 citation statements)

References 24 publications

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“…Consequently a MD can be regarded as a self-arresting discharge of a few ns duration. More advanced numerical models were published for atmospheric pressure air [15] and N 2 [16]. Computed emission intensities of the second positive and the first negative systems of nitrogen agree with recent experimental data.…”

Section: Single Filament Modellingsupporting

confidence: 69%

Collective phenomena in volume and surface barrier discharges

Kogelschatz

2010

J. Phys.: Conf. Ser.

105

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Abstract. Barrier discharges are increasingly used as a cost-effective configuration to produce non-equilibrium plasmas at atmospheric pressure. This way, copious amounts of electrons, ions, free radicals and excited species can be generated without significant heating of the background gas. In most applications the barrier is made of dielectric material. Major applications utilizing mainly dielectric barriers include ozone generation, surface cleaning and modification, polymer and textile treatment, sterilization, pollution control, CO 2 lasers, excimer lamps, plasma display panels (flat TV screens). More recent research efforts are devoted to biomedical applications and to plasma actuators for flow control. Sinusoidal feeding voltages at various frequencies as well as pulsed excitation schemes are used. Volume as well as surface barrier discharges can exist in the form of filamentary, regularly patterned or diffuse, laterally homogeneous discharges. The physical effects leading to collective phenomena in volume and surface barrier discharges are discussed in detail. Special attention is paid to selforganization of current filaments and pattern formation. Major similarities of the two types of barrier discharges are elaborated.

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Section: Single Filament Modellingsupporting

confidence: 69%

Collective phenomena in volume and surface barrier discharges

Kogelschatz

2010

J. Phys.: Conf. Ser.

105

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“…2. Streamer velocities associated with electrical breakdown are found to be typically ∼10 5 m · s −1 , in good agreement with previous values from detailed modeling of N 2 DBDs [2]. Our results also suggest that the streamer velocity slowly decreases with both increasing N 2 pressure and increasing pulse-repetition rate.…”

supporting

confidence: 90%

“…However, the breakdown dynamics of the homogeneous discharge in N 2 have not been investigated in detail. Modeling studies of filamentary N 2 DBDs [2] show that the electrical breakdown of the discharge gap is characterized by the appearance of a fast-moving ionization wave or a streamer propagating from the anode toward the cathode. It is generally accepted that this streamer is correlated with the spatiotemporal evolution of the optical emission resulting from the decay of high-lying excited states (N * * 2 ) in the discharge.…”

mentioning

confidence: 99%

Streak Images of the Breakdown Phase of a Pulsed Dielectric Barrier Discharge in Nitrogen

Carman

Mildren

Falconer

et al. 2011

IEEE Trans. Plasma Sci.

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Streak images of the visible/ultraviolet emission from a pulsed excited N 2 dielectric barrier discharge lamp are presented revealing streamer-type breakdown characteristics.Index Terms-Dielectric barrier discharge, electrical breakdown, nitrogen, pulsed discharge, streak image, streamer. D IELECTRIC barrier discharges (DBDs) using flowing N 2 are of current interest as sources of long-lived "active nitrogen species" for a wide variety of industrial applications, including GaN film growth [1]. The discharge in N 2 appears visually to fill the region between the electrodes more or less uniformly when using very short pulsed voltage excitation (< 100 ns FWHM), rather than appearing as discrete microdischarge filaments as seen for excitation by sinusoidal voltages. Since the current densities in homogeneous or diffuse N 2 plasmas are lower than those in filamentary plasmas, use of the former may result in more efficient production of the important long-lived excited species (e.g., N * 2 (A 3 Σ + u ) and N * ( 2 D) metastables), compared with ionized nitrogen species. However, the breakdown dynamics of the homogeneous discharge in N 2 have not been investigated in detail. Modeling studies of filamentary N 2 DBDs [2] show that the electrical breakdown of the discharge gap is characterized by the appearance of a fast-moving ionization wave or a streamer propagating from the anode toward the cathode. It is generally accepted that this streamer is correlated with the spatiotemporal evolution of the optical emission resulting from the decay of high-lying excited states (N * * 2 ) in the discharge. In this paper, we report the streak images of the radiative output from excited nitrogen species in a short-pulsed DBD discharge, where the spatial information is provided as a function of position across the discharge gap. The spectral emission detected by the camera is predominantly in the blue and near ultraviolet (UV), corresponding to selected bands of the sec-typical upper state lifetime τ ∼ 35 ns). The streak images were recorded for a cylindrical lamp of 30-mm outer diameter consisting of two concentric quartz tubes of wall thickness ∼1 mm and spaced to create a 3.5-mm-wide discharge gap, as described in [3]. End windows made of VUV-grade fused silica (Suprasil), glued on to the ends with low-vapor-pressure epoxy, allowed line-of-sight optical measurements to be performed in the direction parallel to the dielectric surfaces. Electrodes made of brass shim were applied to the inner and outer surfaces of the lamp, over an arc of ∼ 120 • , to provide a partial discharge. UHP grade nitrogen (99.999%) was used. The lamp was excited by pulses of voltage 6-8 kV with rise time ∼100 ns and duration ∼200 ns, at pulse-repetition rates of 3-100 kHz. At electrical breakdown, a narrow discharge current pulse of ∼15-ns FWHM was measured, superimposed on the "displacement" current of the lamp. Streak images of the visible/UV lamp radiation from a narrow stripe (∼0.5 mm) of a radial spoke of emission were recorded. A Hamamatsu C4187 camer...

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“…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

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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.

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Two-dimensional modelling of a nitrogen dielectric barrier discharge (DBD) at atmospheric pressure: filament dynamics with the dielectric barrier on the cathode

Cited by 46 publications

References 24 publications

Collective phenomena in volume and surface barrier discharges

Collective phenomena in volume and surface barrier discharges

Streak Images of the Breakdown Phase of a Pulsed Dielectric Barrier Discharge in Nitrogen

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

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