Account of nonlocal ionization by fast electrons in the fluid models of a direct current glow discharge

Rafatov, İsmail; Bogdanov, E. A.; Kudryavtsev, A. A.

doi:10.1063/1.4752419

Cited by 53 publications

(52 citation statements)

References 37 publications

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“…It corresponds to an electron temperature of 14.66 eV. This value is close to that obtained by the two models of ref [13] but lower than that obtained in ref [12] by fluid models using the software COMSOL Multiphysics for "p.L = 3 Torr.cm".…”

Section: Resultssupporting

confidence: 50%

“…These results are compared with the simulation carried for p = 1Torr, V = 250 V and L = 1 cm, in ref [13] for argon glow discharge with a simple fluid model, an extended fluid model, where electron transport coefficients and the rates of the electron-induced plasma chemical reactions are calculated as functions of the mean electron energy and the two new models with a nonlocal ionization source. The plasma electron density obtained by our simulation (around 10 13 cm -3 ) for "pL = 3 Torr.cm" seems consistent with the new models where plasma electron density is about 10 11 to 10 12 cm -3 , contrary to the extended fluid model where the electron density is underestimated.…”

Section: Resultsmentioning

confidence: 99%

“…It's one of the most noble gases used for plasma surfaces treatment [10,11]. Moreover, modeling argon plasma is still relevant, because of the simplicity of the chemical reactions that occur in the discharge, in order to test the different models developed with the aim of getting more models effective [12,13]. In this work, we focus on the modeling of low pressure argon DC discharge plasma.…”

Section: Introductionmentioning

confidence: 99%

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Pressure and Free Flight Time Effects on Glow Discharge Characteristics

Bouanaka¹,

Rebiai²

2013

IJCA

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In this work, a model for a DC glow discharge at low pressure, used in many applications has been developed. This model allows the determination of plasma characteristics distributions in 2D geometry. The proposed theoretical model is applied to collisional argon plasma at low pressure in a reactor consisting of two plane parallel electrodes where the cathode is heated to a voltage of -250 V. The proposed code is based on solving the continuity equation coupled with Poisson's equation and electrons mean energy's equation. The particles trajectories simulation requires the knowledge of all collisional processes through their collision cross sections. The probability of collision during a free flight time can not be known without performing integrations of non-analytical cross sections. The proposed solution to this problem consists in the application of the "null collision" concept. The simulation results are shown in terms of spatial distribution of charged particles, potential, electric field, electrons energy and velocity. The study of the pressure (0.1-1Torr) and the free flight time (5.11x10 -9 to 1.46 x10 -7 s) effect, on the plasma characteristics, confirms the validity of this model

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Section: Resultssupporting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pressure and Free Flight Time Effects on Glow Discharge Characteristics

Bouanaka¹,

Rebiai²

2013

IJCA

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“…All the reaction rates are referred to those used in Refs. [25][26][27]. The densities of all the particles are described by the continuity equation: @n k ðy; tÞ @t þ @j k ðy; tÞ @y ¼ S k ðy; tÞ;…”

Section: Modelmentioning

confidence: 99%

Influence of driving frequency on discharge modes in a dielectric-barrier discharge with multiple current pulses

et al. 2013

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A one-dimensional self-consistent fluid model was employed to investigate the effect of the driving frequency on the discharge modes in atmospheric-pressure argon discharge with multiple current pulses. The discharge mode was discussed in detail not only at current peaks but also between two adjacent peaks. The simulation results show that different transitions between the Townsend and glow modes during the discharge take place with the driving frequency increased. A complicated transition from the Townsend mode, through glow, Townsend, and glow, and finally back to the Townsend one is found in the discharge with the driving frequency of 8 kHz. There is a tendency of transition from the Townsend to glow mode for the discharge both at the current peaks and troughs with the increasing frequency. The discharge in the half period can all along operate in the glow mode with the driving frequency high enough. This is resulted from the preservation of more electrons in the gas gap and acquisition of more electron energy from the swiftly varying electric field with the increase in driving frequency. Comparison of the spatial and temporal evolutions of the electron density at different driving frequencies indicates that the increment of the driving frequency allows the plasma chemistry to be enhanced. This electrical characteristic is important for the applications, such as surface treatment and biomedical sterilization. V C 2013 AIP Publishing LLC.

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“…Отметим, что для короткого (без PC) разряда в последнее время был достигнут значительный прогресс в понимании физических механизмов формирования его параметров [2,[11][12][13][14][15][16]. Было показано, что характерными точками продольной структуры разряда в первую оче-редь являются: граница слоя катодного падения d, раз-деляющая области объемного заряда и плазмы, и точка максимума концентрации плазмы x m , которой соответ-ствует экстремум электрического потенциала ϕ(x) (пер-…”

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