Unified modelling of near-cathode plasma layers in high-pressure arc discharges

Almeida, N. A.; Benilov, M. S.; Naidis, G. V.

doi:10.1088/0022-3727/41/24/245201

Cited by 78 publications

(167 citation statements)

References 64 publications

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“…Non-equilibrium plasma model was utilized: separate equations for temperatures of electrons and heavy particles were solved, diffusion of electrons and ions were accounted for, allowing better prediction of the electric field strength, heating and temperature profiles in the arcing volume. Transport coefficients in the plasma were taken from [41]. The plasma model was benchmarked in Ref.…”

Section: Arc Modelmentioning

confidence: 99%

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Synthesis of nanoparticles in carbon arc: measurements and modeling

et al. 2018

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This work studies the region of nanoparticle growth in atmospheric pressure carbon arc.Detection of the nanoparticles is realized via the planar laser induced incandescence (PLII) approach.Measurements revealed large clouds of nanoparticles in the arc periphery, bordering the region with high density of diatomic carbon molecules. Two-dimensional computational fluid dynamic simulations of the arc combined with thermodynamic modeling explain these results due to interplay of the condensation of carbon molecular species and the convection flow pattern. The results have shown that the nanoparticles are formed in the colder, outside regions of the arc and described the parameters necessary for coagulation.

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Section: Arc Modelmentioning

confidence: 99%

“…The plasma model was benchmarked in Ref. [42] by comparison to the results of previous numerical studies [41] and in Ref. 43 by comparison to analytical solutions.…”

Section: Arc Modelmentioning

confidence: 99%

Synthesis of nanoparticles in carbon arc: measurements and modeling

et al. 2018

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“…The first one is the unified approach developed by Almeida et al [16]. It is free from any a priori introduction of a boundary layer and consists in a single set of equations valid throughout the cathode layer and the plasma column.…”

mentioning

confidence: 99%

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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“…These deviations are expressed as differences between the electron and heavy particle temperatures (T e [ T g ), especially when the operating current is relatively low. It was also proven by numerical simulation of the plasma parameters that a relaxation of the electron temperature takes place in the mercury in the vicinity of the cathode [24].…”

Section: Relaxation Of the Electron Temperature Near The Cathodementioning

confidence: 95%

Model of the Plasma Photovoltaic Conversion of Concentrated Solar Radiation: Short-Circuit Current and Open-Circuit Voltage

Горбунов

Flamant

2015

Plasma Chem Plasma Process

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A model of the direct photoelectric conversion of concentrated solar radiation in a plasma ignited in a heat pipe filled with a mixture of sodium vapor and krypton is developed. The model considers the non-homogeneous distribution of the alkali atom density in the heat-pipe volume and the thermionic effect of a cathode. The model treats a hot plasma core in a local thermal equilibrium (LTE) state and takes into account nonequilibrium layers near the converter walls. The model is employed to calculate an opencircuit voltage, a plasma resistance, a short-circuit current, an energy flux of positive ions directed toward the cathode, and a conversion efficiency of the solar radiation. Two different approaches were used to estimate a value of the electron temperature in the ionization non-equilibrium layer near the cathode. We assumed within the framework of an isothermal approximation that the electron temperature in the ionization layer near the cathode is equal to the temperature of the LTE plasma. This isothermal model predicted a rather low value (approximately 3 %) for the conversion efficiency. We found within the framework of a two-temperature model that the reduction of the electron temperature by 20 % compared with the LTE plasma temperature took place at the outer boundary of the ionization layer near the cathode. This non-isothermal model predicts a rather high value (approximately 33 %) for the conversion efficiency for a 3009 solar radiation concentration ratio.

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Unified modelling of near-cathode plasma layers in high-pressure arc discharges

Cited by 78 publications

References 64 publications

Synthesis of nanoparticles in carbon arc: measurements and modeling

Synthesis of nanoparticles in carbon arc: measurements and modeling

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

Model of the Plasma Photovoltaic Conversion of Concentrated Solar Radiation: Short-Circuit Current and Open-Circuit Voltage

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