To read the full version of this content please select one of the options below:

Heating of the cathode with a conical tip by atmospheric-pressure arc plasma

Meng-Ran Liao (Department of Science and Technology on Thermal Energy and Power Laboratory, Wuhan Second Ship Design and Research Institute, Wuhan, China)
Tang Chen (School of Astronautics, Beihang University, Beijing, China)
Wei-Jian Lv (Department of Science and Technology on Thermal Energy and Power Laboratory, Wuhan Second Ship Design and Research Institute, Wuhan, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 11 July 2019

Abstract

Purpose

In this study, the authors performed a numerical investigation on the heating of a hot cathode with a conical tip by atmospheric arc, taking into account of the two temperature sheath effect for the first time.

Design/methodology/approach

The Schottky effect at cathode surface is considered, which is based on the analytic solution of a one-dimensional sheath model. The unified model allows one to predict the cathode-plasma heat transfer.

Findings

The total heat flux to cathode surface is smaller than its components’ heat flux due to electron back diffusion is as large as that due to ion flux with the increase of cathode length the total heat transported to the cathode body has an obvious decrease.

Originality/value

It is found that two kinds of solution exist for the cathode with a 140° conical tip; however, only one stable solution exists when the conical angle is reduced to 130°.

Keywords

Citation

Liao, M.-R., Chen, T. and Lv, W.-J. (2019), "Heating of the cathode with a conical tip by atmospheric-pressure arc plasma", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 5, pp. 2379-2395. https://doi.org/10.1108/HFF-03-2019-0246

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited