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Title: Boundary conditions at the walls with thermionic electron emission in two temperature modeling of “thermal” plasmas

In this paper, we propose new boundary conditions for the electric potential, the electron energy equation, and the energy equation for heavy particles (ions and neutrals) at the hot walls with thermionic electron emission for two-temperature thermal arc models. The derived boundary conditions assume that the walls are made from refractory metals and, consequently, the erosion of the wall is small and can be neglected. In these boundary conditions, the plasma sheath formed at the electrode is viewed as the interface between the plasma and the wall. The derived boundary conditions allow the calculation of the heat flux to the walls from the plasma. This allows the calculation of the thermionic electron current that makes the model of electrode-plasma interaction self-consistent.
Authors:
;  [1]
  1. Victor Technologies, West Lebanon, New Hampshire 03781 (United States)
Publication Date:
OSTI Identifier:
22490095
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; ELECTRIC POTENTIAL; ELECTRODES; ELECTRON EMISSION; EROSION; HEAT FLUX; HOT PLASMA; IONS; NEUTRAL PARTICLES; PLASMA SHEATH; REFRACTORY METALS; SIMULATION; THERMIONIC EMISSION; WALLS