Comparison between 1D radial and 0D global models for low-pressure oxygen DC glow discharges

Authors

ARSÉNIO NUNES ALEIXO VIEGAS Pedro DIAS Tiago FROMENTIN Chloé CHUKALOVSKY Alexander MANKELEVICH Yuri PROSHINA Olga RAKHIMOVA Tatyana GUERRA Vasco VOLOSHIN Dmitry

Year of publication 2023
Type Article in Periodical
Magazine / Source PLASMA SOURCES SCIENCE & TECHNOLOGY
Citation
Web https://iopscience.iop.org/article/10.1088/1361-6595/acbb9c
Doi http://dx.doi.org/10.1088/1361-6595/acbb9c
Description This work focuses on the comparison between a zero-dimensional (0D) global model (LoKI) and a one-dimensional (1D) radial fluid model for the positive column of oxygen DC glow discharges in a tube of 1 cm inner radius at pressures between 0.5 Torr and 10 Torr. The data used in the two models are the same, so that the difference between the models is reduced to dimensionality. A good agreement is found between the two models on the main discharge parameters (gas temperature, electron density, reduced electric field and dissociation fraction), with relative differences below 5%. The agreement on other species average number densities, charged and neutral, is slightly worse, with relative differences increasing with pressure from 11% at 0.5 Torr to 57% at 10 Torr. The success of the 0D global model in describing these plasmas through volume averaged quantities decreases with pressure, due to pressure-driven narrowing of radial profiles. Hence, in the studied conditions, we recommend the use of volume-averaged models only in the pressure range up to 10 Torr.
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