Account of near-cathode sheath in numerical models of high-pressure arc discharges

Benilov, M. S.; Almeida, N. A.; Baeva, M.; Cunha, M. D.; Benilova, L. G.; Uhrlandt, D.

http://hdl.handle.net/10400.13/2599

Use this identifier to reference this record.

Name:	Description:	Size:	Format:
Account of near-cathode sheath in numerical models of high-pressure arc discharges.pdf		1.72 MB	Adobe PDF	Download

Send Feedback

Authors

Abstract(s)

Three approaches to describing the separation of charges in near-cathode regions of highpressure arc discharges are compared. The first approach employs a single set of equations, including the Poisson equation, in the whole interelectrode gap. The second approach employs a fully non-equilibrium description of the quasi-neutral bulk plasma, complemented with a newly developed description of the space-charge sheaths. The third, and the simplest, approach exploits the fact that significant power is deposited by the arc power supply into the near-cathode plasma layer, which allows one to simulate the plasma–cathode interaction to the first approximation independently of processes in the bulk plasma. It is found that results given by the different models are generally in good agreement, and in some cases the agreement is even surprisingly good. It follows that the predicted integral characteristics of the plasma–cathode interaction are not strongly affected by details of the model provided that the basic physics is right.

Keywords

High-pressure arcs Near-electrode phenomena Arc-cathode interaction Space-charge sheaths . Faculdade de Ciências Exatas e da Engenharia

URI

http://hdl.handle.net/10400.13/2599

Citation

Benilov, M. S., Almeida, N. A., Baeva, M., Cunha, M. D., Benilova, L. G., & Uhrlandt, D. (2016). Account of near-cathode sheath in numerical models of high-pressure arc discharges. Journal of Physics D: Applied Physics, 49(21), 215201.