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Publication
Sheath and arc-column voltages in high-pressure arc discharges
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Advisor(s)
Abstract(s)
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 contributes about two-thirds or
more of the arc voltage. The LTE model predicts a different variation of the arc voltage with I
and underestimates the experimental values appreciably for low currents but by no more than
approximately 2 V for I 120 A. However, the latter can hardly be considered as a proof of
unimportance of the space-charge sheath at high currents: the LTE model overestimates both
the resistance of the bulk of the arc column and the resistance of the part of the column that is
adjacent to the cathode, and this overestimation to a certain extent compensates for the neglect
of the voltage drop in the sheath. Furthermore, if the latter resistance were evaluated in the
framework of the LTE model in an accurate way, then the overestimation would be still much
stronger and the obtained voltage would significantly exceed those observed in the experiment.
Description
Keywords
Sheath Arc-column voltages High-pressure arc discharges . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., Benilova, L. G., Li, H. P., & Wu, G. Q. (2012). Sheath and arc-column voltages in high-pressure arc discharges. Journal of Physics D: Applied Physics, 45(35), 355201. DOI: 10.1088/0022-3727/45/35/355201
Publisher
IOP Publishing