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Joule heat generation in thermionic cathodes of high-pressure arc discharges
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Orientador(es)
Resumo(s)
The nonlinear surface heating model of plasma-cathode interaction in high-pressure arcs is
extended to take into account the Joule effect inside the cathode body. Calculation results are given
for different modes of current transfer to tungsten cathodes of different configurations in argon
plasmas of atmospheric or higher pressures. Special attention is paid to analysis of energy balances
of the cathode and the near-cathode plasma layer. In all the cases, the variation of potential inside
the cathode is much smaller than the near-cathode voltage drop. However, this variation can be
comparable to the volt equivalent of the energy flux from the plasma to the cathode and then the
Joule effect is essential. Such is the case of the diffuse and mixed modes on rod cathodes at high
currents, where the Joule heating causes a dramatic change of thermal and electrical regimes of the
cathode. The Joule heating has virtually no effect over characteristics of spots on rod and infinite
planar cathodes.
Descrição
Palavras-chave
Joule heat generation Thermionic cathodes High-pressure arc discharges . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Benilov, M. S., & Cunha, M. D. (2013). Joule heat generation in thermionic cathodes of high-pressure arc discharges. Journal of Applied Physics, 113(6), 063301.
Editora
American Institute of Physics