2d-Model of Glow Discharge Atmospheric Pressure Plasma in Helium Formed after Spark Breakdown: Calculation of the Electrophysical and Thermodynamic Parameters

Demkin, V. P.; Melnichuk, S. V.; Postnikov, A. V.

doi:10.1007/s11182-020-01920-z

Cited by 1 publication

(1 citation statement)

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“…A more appropriate description of thermal nonequilibrium requires the solution of two separate energy conservation equations, one for the heavy-species and one for the electrons, leading to what are commonly known as two-temperature models. Two-temperature models are significantly more computationally expensive than one-temperature ones, but usually lead to simulations depicting improved agreement with experimental results [25,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional modelling of a self-sustained atmospheric pressure glow discharge

Boutrouche¹,

Trelles²

2022

J. Phys. D: Appl. Phys.

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The Atmospheric Pressure Glow Discharge (APGD) is a relatively simple and versatile plasma source used in diverse applications. Stable APGD operation at high currents, generally a challenge due to instabilities leading to glow-to-arc transition, has been demonstrated using actively-controlled cathodic cooling. This article presents the computational modelling and simulation of a self-sustained direct-current APGD in helium within a 10 mm pin-to-plate inter-electrode gap for currents ranging from 4 to 40 mA. The APGD model is comprised of the conservation equations for total mass, chemical species, momentum, thermal energy of heavy-species and of free electrons, and electric charge. The model equations are discretized using a nonlinear Variational Multi-Scale Finite Element Method that has demonstrated superior accuracy in other plasma flow problems, on a temporal and three-dimensional computational domain suitable to unveil the potential occurrence of instabilities. Modelling results show good agreement with experimental measurements of voltage drop and the same trend but higher values of temperature. The higher temperatures obtained by the simulations appear to be due to the absence of a near-cathode heat dissipation model. The results also reveal that the distribution of electron density and of the ratio of atomic helium ions to total ions transitions from monotonically increasing away from the cathode to presenting a minimum near the centre of the gap with increasing current.

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