Novel non-equilibrium modelling of a DC electric arc in argon

Baeva, M.; Benilov, M. S.; Almeida, N. A.; Uhrlandt, Dirk

doi:10.1088/0022-3727/49/24/245205

Cited by 79 publications

(145 citation statements)

References 35 publications

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“…In fact, the model of [13] does not verify current continuity and energy conservation at the cathode/plasma interface. Recently, the model was significantly improved to match current continuity and energy conservation of the plasma column with the cathode [14]. For this a complete diffusion treatment of particle fluxes, and a generalized Ohm's law were used.…”

mentioning

confidence: 99%

“…For this a complete diffusion treatment of particle fluxes, and a generalized Ohm's law were used. These improvements lead to a focusing of the arc and thus an increase of the calculated plasma column temperature (without using an adjustable parameter) [14,15].…”

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confidence: 99%

“…The novel FNE-model [14] was also recently compared to two other numerical approaches describing in different ways the cathode layer coupling cathode and plasma column. The first one is the unified approach developed by Almeida et al [16].…”

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confidence: 99%

“…The plasma column is then modeled with a two-temperature plasma (2T-plasma) model assuming chemical equilibrium (another possible alternative is a local thermal equilibrium or LTE-plasma [11]). The cathode layer is, as in [14], made of a space-charge layer (or sheath), a Knudsen layer, and an ionization layer (or pre-sheath). But the ionization layer is treated as part of the cathode boundary since it cannot be described by a plasma column that assumes chemical equilibrium.…”

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confidence: 99%

“…Numerical results are presented in the sequel to illustrate the effect of some modelling assumptions. Modelling assumptions specific to the FNE-approach by Baeva et al [11,14], and to the approach developed by Pekker at al. [19,20], are also addressed.…”

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confidence: 99%

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Gas tungsten arc models including the physics of the cathode layer: remaining issues

Choquet

2017

Weld World

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A recent review pointed out that the existing models for gas tungsten arc coupling the electrode (a cathode) and the plasma are not yet complete enough. Their strength is to predict with good accuracy either the electric potential or the temperature field in the region delimited by the electrode and the workpiece. Their weakness is their poor ability to predict with good accuracy these two fields at once. However, both of these fields are important since they govern the heat flux to the workpiece through current density and temperature gradient. New developments have been made since then. They mainly concern the approaches addressing the electrode sheath (or space charge layer) that suffered from an underestimation of the arc temperature. These new developments are summarized and discussed, the modelling assumptions are examined, and important modelling issues that remain unexplored are underlined.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Gas tungsten arc models including the physics of the cathode layer: remaining issues

Choquet

2017

Weld World

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Numerical analysis of chemical reaction processes in different anode attachments of a high‐intensity argon arc

Sun

Wang

Zhu

2019

Contributions to Plasma Physics

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The attachment mode of arc on anode is closely related to the non‐equilibrium chemical kinetics process of the anode region of arc. In this paper, the detailed chemical reaction mechanisms in the flow‐affected region for both diffuse and constricted argon arc attachments are investigated by means of one‐dimensional discharge coupled with a single‐fluid, two‐temperature model. The collisional‐radiative model is used to examine the chemical reaction processes occurring in the anode region, including the arc centreline and fringe region. The numerical results are validated by comparison with available experimental data. The obtained radial distributions of electron temperature, electron density, excited states densities, ionization, and recombination processes reveal that different mechanisms dominate the diffuse and constricted arc‐anode attachments.

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Plasma parameters of microarcs towards minuscule discharge gap

Baeva

Loffhagen

Becker

et al. 2020

Contributions to Plasma Physics

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This paper describes the behaviour of the plasma parameters of microarcs generated between a cooled copper anode and a ceriated tungsten cathode by means of a one-dimensional unified non-equilibrium model for gap lengths between 15 and 200 μm and current densities from 2 × 10 5 up to 10 6 A/m 2. The results obtained show that the decrease of the gap length to a few tens of micrometres for a given current density results in a progressive shrinking of the quasi-neutral bulk in the microplasma and its complete disappearance. The decrease of the gap length further leads to an increase of the discharge voltage and the electron temperature and to slightly less heating of the gas.

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Novel non-equilibrium modelling of a DC electric arc in argon

Cited by 79 publications

References 35 publications

Gas tungsten arc models including the physics of the cathode layer: remaining issues

Gas tungsten arc models including the physics of the cathode layer: remaining issues

Numerical analysis of chemical reaction processes in different anode attachments of a high‐intensity argon arc

Plasma parameters of microarcs towards minuscule discharge gap

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