Journal ArticleDOI
The influence of negative ions in helium-oxygen barrier discharges: II. 1D fluid simulation and adaption to the experiment
TLDR
In this paper, a 1D fluid simulation was developed to investigate the influence of negative ions in a helium-oxygen barrier discharge between two glass plates at a distance of, where the simulation was adapted to the experimentally observed discharge current and gap voltage by varying gas temperature, flux of thermally desorpted electrons and secondary electron emission coefficients.Abstract:
A 1D fluid simulation was developed to investigate the influence of negative ions in a helium–oxygen barrier discharge between two glass plates at a distance of . The paper describes setting up the simulation for a pressure of and an admixture of oxygen to helium. In order to enable the comparison with laser photodetachment experiments, the simulation is adapted to the experimentally observed discharge current and gap voltage by varying gas temperature, flux of thermally desorpted electrons and secondary electron emission coefficients. The discharge is characterized by evaluation of the most important elementary collision processes as well as the kinetics of the charged species. Besides, the influence of long-living species on the discharge behavior is taken into account by long-time simulations. The negative ions are characterized by their spatio-temporal distribution in the gap and their production and loss processes. The comparison between simulations without and with consideration of negative ions reveals the importance of negative ions on the discharge development.read more
Citations
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Journal ArticleDOI
Surface charge measurements on different dielectrics in diffuse and filamentary barrier discharges
TL;DR: In this paper, the authors measured surface charges during the operation of barrier discharges using the electro-optic Pockels effect of a bismuth silicon oxide (BSO) crystal.
Journal ArticleDOI
Numerical simulation of capillary helium and helium-oxygen atmospheric pressure plasma jets: propagation dynamics and interaction with dielectric
Constantinos Lazarou,Charalambos Anastassiou,Ionut Topala,A. S. Chiper,Ilarion Mihaila,Valentin Pohoata,George E. Georghiou +6 more
TL;DR: In this paper, a two-dimensional axi-symmetric model has been developed to provide insight into the evolution of capillary helium plasma jets with and without oxygen admixtures and their interaction with a dielectric surface placed normal to the jet axis.
Journal ArticleDOI
Impact of volume and surface processes on the pre-ionization of dielectric barrier discharges: advanced diagnostics and fluid modeling
S Nemschokmichal,R Tschiersch,H. Höft,R. Wild,Marc Bogaczyk,Markus M. Becker,Detlef Loffhagen,L. Stollenwerk,M. Kettlitz,Ronny Brandenburg,Jürgen Meichsner +10 more
TL;DR: In this article, the authors investigated the role of residual species in the volume or surface charges on the dielectrics in the breakdown behavior of filamentary and diffuse discharges and analyzed the opportunities for manipulating the lateral structure and discharge modes.
Journal ArticleDOI
Influence of released surface electrons on the pre-ionization of helium barrier discharges: laser photodesorption experiment and 1D fluid simulation
TL;DR: In this paper, the role of residual weakly-bound surface electrons acting as an effective seed electron reservoir that favors the pre-ionization of diffuse barrier discharges (BDs) was highlighted.
Journal ArticleDOI
Influence of air impurities on the transition from a symmetric discharge to an asymmetric discharge in an atmospheric pressure helium diffuse dielectric barrier discharge
TL;DR: In this article, a one-dimensional fluid model with 26 species and 154 reactions is developed to thoroughly investigate the influence of air impurities on the transition from the SP1 discharge to the AP1 one in atmospheric DBDs in a helium mixture with air impurity.
References
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Journal ArticleDOI
Dielectric-barrier Discharges: Their History, Discharge Physics, and Industrial Applications
TL;DR: In this article, the authors discuss the history, discharge physics, and plasma chemistry of dielectric-barrier discharges and their applications and discuss the applications of these discharges.
Journal ArticleDOI
Solving the Boltzmann equation to obtain electron transport coefficients and rate coefficients for fluid models
G J M Hagelaar,Leanne Pitchford +1 more
TL;DR: The BOLSIG+ solver as mentioned in this paper provides steady-state solutions of the BE for electrons in a uniform electric field, using the classical two-term expansion, and is able to account for different growth models, quasi-stationary and oscillating fields, electron-neutral collisions and electron-electron collisions.
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Total Cross Sections for Ionization and Attachment in Gases by Electron Impact. I. Positive Ionization
TL;DR: In this paper, a new method was devised for obtaining absolute cross sections of gases relative to H2, and a McLeod gauge was used to obtain the absolute cross section in H2.
Journal ArticleDOI
Kinetic scheme of the non-equilibrium discharge in nitrogen-oxygen mixtures
TL;DR: In this paper, a non-equilibrium discharge in nitrogen-oxygen mixtures is developed, which almost wholly describes chemical transformations of particles in the cold (200 K
Journal ArticleDOI
Non-thermal atmospheric pressure discharges
TL;DR: In this paper, the four most important and widely used varieties of non-thermal discharges: corona, dielectric barrier, gliding arc and spark discharge are discussed.