2012
DOI: 10.1088/0022-3727/45/35/355201
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Sheath and arc-column voltages in high-pressure arc discharges

Abstract: Electrical characteristics of a 1 cm-long free-burning atmospheric-pressure argon arc are calculated by means of a model taking into account the existence of a near-cathode space-charge sheath and the discrepancy between the electron and heavy-particle temperatures in the arc column. The computed arc voltage exhibits a variation with the arc current I similar to the one revealed by the experiment and exceeds experimental values by no more than approximately 2 V in the current range 20-175 A. The sheath contrib… Show more

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Cited by 37 publications
(72 citation statements)
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References 32 publications
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“…This fact can be considered in a proper way replacing the LTE arc model by a two-temperature plasma model. This option has been applied recently to the description of a TIG arc including the cathode fall and the tungsten cathode temperature [10]. The results are in a good agreement with the measurements.…”
Section: Introductionsupporting
confidence: 63%
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“…This fact can be considered in a proper way replacing the LTE arc model by a two-temperature plasma model. This option has been applied recently to the description of a TIG arc including the cathode fall and the tungsten cathode temperature [10]. The results are in a good agreement with the measurements.…”
Section: Introductionsupporting
confidence: 63%
“…A more detailed validation of the model results for the arc properties with spectroscopic measurements was the subject of a recent work [10].…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In the first approach, LTE is generally assumed, while in the second, a two-temperature treatment is necessary, since the sheath is a critical component of the model, being responsible for transport of power to both the electrode and the arc column. Two main two-temperature models have been developed; in that of Baeva et al [37], deviations from ionization equilibrium (i.e., from local chemical equilibrium) are also taken into account in both the sheath and arc column, while in that of Benilov et al [38], deviations from ionization equilibrium are only considered in the sheath. The two-temperature models were compared recently [36], and shown to give similar results in the arc column.…”
Section: Arc-electrode Sheathsmentioning
confidence: 99%
“…In recent years, different variants of this model have been used also for high currents typical of arc welding. [10][11][12][13] In this work, the model of nonlinear surface heating is written with account of Joule heating, similarly to Refs. 2 and 3.…”
Section: The Modelmentioning
confidence: 99%