Loading...
Publication
Heating of refractory cathodes by high-pressure arc plasmas: II
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 507.07 KB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Solitary spots on infinite planar cathodes and diffuse and axially symmetric
spot modes on finite cathodes of high-pressure arc discharges are studied in
a wide range of arc currents. General features are analysed and extensive
numerical results on planar and cylindrical tungsten cathodes of
atmospheric-pressure argon arcs are given for currents of up to 100 kA. It is
shown, in particular, that the temperature of cathode surface inside a solitary
spot varies relatively weakly and may be estimated, to the accuracy of about
200–300 K, without actually solving the thermal conduction equation in the
cathode body. Asymptotic behaviour of solutions for finite cathodes in the
limiting case of high currents is found and confirmed by numerical results.
A general pattern of current–voltage characteristics of various modes on
finite cathodes suggested previously on the basis of bifurcation analysis is
confirmed. A transition from the spot modes on a finite cathode in the limit
of large cathode dimensions to the solitary spot mode on an infinite planar
cathode is studied. It is found that the solitary spot mode represents a
limiting form of the high-voltage spot mode on a finite cathode. A question
of distinguishing between diffuse and spot modes on finite cathodes is
considered.
Description
Keywords
Heating of refractory cathodes Refractory cathodes High-pressure arc plasmas Arc plasmas . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., & Cunha, M. D. (2003). Heating of refractory cathodes by high-pressure arc plasmas: II. Journal of Physics D: Applied Physics, 36(6), 603-614.
Publisher
IOP Publishing