The results of the modelling of a filamentary dielectric barrier discharge (DBD) in argon at atmospheric pressure obtained using a time-dependent and spatially two-dimensional fluid-Poisson model in axisymmetric geometry are provided in this dataset. The model was employed to investigate the formation mechanisms of the striations along the discharge channel in a one-sided DBD arrangement with a 1.5 mm gap powered by a sinusoidal high voltage applied at the metal electrode. The discharge conditions were chosen to resemble the experimental conditions for which striations have been observed. It was found that the striations form in both half-periods during the transient glow phase, which follows the streamer breakdown phase. The modelling results showed that the distinct striated structures feature local spatial maxima and minima in charged and excited particle densities, which were more pronounced during the positive polarity. Their formation was explained by a repetitive stepwise ionisation of metastable argon atoms and ionisation of excimers, causing a disturbance of the spatial distribution of charge carriers along the discharge channel. The results emphasise the importance of excited states and stepwise ionisation processes on the formation of repetitive ionisation waves, eventually leading to striations along the discharge channel.
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Authors | |
Release Date | 2023-04-25 |
Identifier | 635c4fbc-f299-48c1-a843-c6dced54cf4c |
Permanent Identifier (DOI) | |
Permanent Identifier (URI) | |
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Plasma Source Name | |
Plasma Source Application | |
Plasma Source Specification | |
Plasma Source Properties | The modelling was performed for the DBD in an asymmetric arrangement with a 1.5 mm gap, electrode radius of 2 mm and 0.5 mm thick dielectric (alumina, relative permittivity 9) covering grounded electrode, driven by sinusoidal voltage (voltage amplitude of 1.3 kV and frequency of 60 kHz, corresponding to a period of T = 16.67 microseconds). |
Plasma Medium Name | |
Plasma Medium Properties | Pure argon, gas pressure is 760 Torr, constant gas temperature of 300 K |
Plasma Diagnostics Name | |
Plasma Diagnostics Properties | Model: Fluid-Poisson model in cylindrical geometry; |
Plasma Diagnostics Procedure | An atmospheric-pressure DBD in argon is investigated by means of time-dependent and spatially two-dimensional fluid-Poisson modelling in an axisymmetric geometry. The object of interest was formation of the striations along the discharge channel. The model comprises a set of balance equations for the particle number densities of electrons and the most important argon species (atomic Ar+ and molecular Ar2+ ions, as well as the lumped excited atomic Ar∗ and molecular Ar2∗ states of argon), Poisson’s equation for the electric potential and field, the electron energy balance equation and a balance equation for the surface charge density. The quasi-neutral initial conditions and physically-based boundary conditions, accounting for thermal flux and partial reflection of the particles, are used. The additional term describing the ion-induced emission of secondary electrons is included into the boundary conditions for the balance equations for the particle number density and energy density of electrons. The analysis of the spatiotemporal evolution of the particle species, electric field, mean electron energy and rates of electron production after reaching the quasi-periodic state was performed to determine the origin of the striations. The voltage and electric current, as well as the number densities, electric field and electron production rates were exported using LiveLink™ for MATLAB® (https://www.comsol.com/livelink-for-matlab) and post-processed using python3 (https://www.python.org) and Matplotlib (https://matplotlib.org). |
Language | English |
License | |
Public Access Level | Public |
Contact Name | Jovanović, Aleksandar |
Contact Email |
Data and Resources
- Formation mechanisms of striations in a filamentary DBD in atmospheric pressure Ar-Fig.2data
The file contains the two datasets with temporal evolution of the electric...
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The spatial profiles of the electron number density for three characteristic...
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Spatial profiles of the number densities of all included particle species,...
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Spatial profiles of the rates of electron production, and reduced electric...
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The spatial profiles of the electron number density for four characteristic...
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Spatial profiles of the number densities of all included particle species...
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Spatial profiles of the reduced electric field, mean electron energy and...
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Spatial profiles of the rates of electron production, and divergence of the...
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Abel-transformed distribution of the electron density at the time of the...
Download - Formation mechanisms of striations in a filamentary DBD in atmospheric pressure Ar-Fig.13data
The spatial profiles of the electron number density for three characteristic...
Download - Formation mechanisms of striations in a filamentary DBD in atmospheric pressure Ar-Fig.14csv
Spatial profiles of the number densities of all included particle species,...
Preview Download - Formation mechanisms of striations in a filamentary DBD in atmospheric pressure Ar-Fig.15csv
Spatial profiles of the rates of electron production, and reduced electric...
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