Simulation of dc atmospheric pressure argon micro glow-discharge

Farouk, Tanvir; Farouk, Bakhtier; Staack, David; Gutsol, A.; Fridman, Alexander

doi:10.1088/0963-0252/15/4/012

Cited by 101 publications

(75 citation statements)

References 37 publications

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“…The thickness of the anode sheath is found to be 77 -90 µm for d = 1 -3 mm, whereas the anode sheath is not fully formed for the d = 0.5 mm case. For d ≥1mm, the thickness of the anode sheath is 16 -20% of that of the cathode sheath, consistent with literature data [47]. Using the space-averaged rms electric field to approximate the anode electric field, the drift distances of anions are found to be L O-= 5 -17 μm, L O2-= 4 -12 μm and L O3-= 10 -33 μm with larger drift distance found at smaller electrode gap.…”

Section: Wall Fluxes Of Key Plasma Speciessupporting

confidence: 87%

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Liu¹,

Yang²,

Wang³

et al. 2012

J. Phys. D: Appl. Phys.

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A radio-frequency (rf) atmospheric-pressure discharge in He-O 2 mixture is studied using a fluid model for its wall fluxes and their dependence on electron and chemical kinetics in the sheath region. It is shown that ground-state O, O 2 + and O -are the dominant wall fluxes of neutral species, cations and anions, respectively. Detailed analysis of particle transport shows that wall fluxes are supplied from a boundary layer of 3 -300 µm immediately next to an electrode, a fraction of the thickness of the sheath region. The width of the boundary layer mirrors the effective excursion distance during lifetime of plasma species, and is a result of much reduced length scale of particle transport at elevated gas pressure. As a result, plasma species supplying their wall fluxes are produced locally within the boundary layer and the chemical composition of the overall wall flux depends critically on spatiotemporal characteristics of electron temperature and density within the sheath. Wall fluxes of cations and ions are found to consist of a train of nanosecond pulses, whereas wall fluxes of neutral species are largely time-invariant.

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Section: Wall Fluxes Of Key Plasma Speciessupporting

confidence: 87%

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Liu¹,

Yang²,

Wang³

et al. 2012

J. Phys. D: Appl. Phys.

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“…Negative potential is applied to the bar, the plane electrode is grounded as zero potential, and the zero charge boundary conditions [34] Within numerical model, the bar-plate electrode system model is simplified into a two-dimensional representation using the rotational symmetry. The computational domain is highlighted with green in Fig.…”

Section: Boundary Conditions and Computational Implementationmentioning

confidence: 99%

Numerical Simulation of the Characteristics of Electrons in Bar-plate DC Negative Corona Discharge Based on a Plasma Chemical Model

Liu¹,

Liao²,

Zhao³

2015

Journal of Electrical Engineering and Technology

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-In order to explore the characteristics of electrons in DC negative corona discharge, an improved plasma chemical model is presented for the simulation of bar-plate DC corona discharge in dry air. The model is based on plasma hydrodynamics and chemical models in which 12 species are considered. In addition, the photoionization and secondary electron emission effect are also incorporated within the model as well. Based on this model, electron mean energy distribution (EMED), electron density distribution (EDD), generation and dissipation rates of electron at 6 typical time points during a pulse are discussed emphatically. The obtained results show that, the maximum of electron mean energy (EME) appears in field ionization layer which moves towards the anode as time progresses, and its value decreases gradually. Within a pulse process, the electron density (ED) in cathode sheath almost keeps 0, and the maximum of ED appears in the outer layer of the cathode sheath. Among all reactions, R1 and R2 are regarded as the main process of electron proliferation, and R 22 plays a dominant role in the dissipation process of electron. The obtained results will provide valuable insights to the physical mechanism of negative corona discharge in air. Keywords: Corona discharge, Plasma chemical, Numerical simulation

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“…Typical drawbacks of low pressure plasma discharge are the necessity of vacuum pumps, low rate of deposition or etching for CVD techniques and size restriction [1][2][3][4]. The non-thermal micro plasma devices also has an increasing trends of application in biomedical applications [5,6], thin film deposition [7] and surface treatment [8,9].…”

Section: Introductionmentioning

confidence: 99%

Modes of oscillation in a high pressure microplasma discharges

Mahamud

Mobli

Farouk

2014

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) Held With 2014 IEEE International Conference on High-Power P

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Atmospheric pressure microplasma devices, have been the subject of considerable research during the last decade. Most of the operation regime of the discharges studied fall in the 'abnormal', 'normal' and 'corona' modes -increasing and a 'flat' voltage current characteristics. However, the Negative Differential Resistance (NDR) regime at atmospheric and high pressures has been less studied and possesses the unique characteristics that can be employed for novel applications. The NDR regime has been studied for low pressure systems and has been characterized to be associated to relaxation oscillation only. In this work we report a detailed study on the different modes of self oscillation in high pressure micro plasma discharges. Detailed 2D numerical simulation has been conducted with a validated model. Predictions and experimental measurements are found to be in favorable agreement. The different self-pulsing modes of oscillation have been identified as, relaxation oscillation having medium to low frequency oscillation at low discharge current and high frequency free running oscillation at comparatively high current condition. In the relaxation oscillation, the discharge switches between a dark and glow like discharge, whereas in the free running mode the transition is observed to occur within glow like modes. These two modes of oscillation are found to be more prevalent at higher pressure. Depending on pressure, the frequency of relaxation and free running oscillations are in the kHzMHz and MHz -GHz range respectively. External parameters influencing these self oscillations are studied.

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Simulation of dc atmospheric pressure argon micro glow-discharge

Cited by 101 publications

References 37 publications

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

Numerical Simulation of the Characteristics of Electrons in Bar-plate DC Negative Corona Discharge Based on a Plasma Chemical Model

Modes of oscillation in a high pressure microplasma discharges

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