Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v6.i3.60
18 pages

ELECTRODE PHENOMENA IN DC ARCS AND THEIR INFLUENCE ON PLASMA TORCH DESIGN

Joachim V. Heberlein
Department of Mechanical Engineering University of Minnesota 111 Church Street S.E. Minneapolis, MN 55455, USA and Department of Mechanical Science and Engineering Tokyo Institute of Technology, Tokyo, Japan

RESUMO

Control over the physical phenomena, which characterize the arc — electrode interaction strongly, influences plasma torch design. Arc cathodes are characterized by their electron emission mechanism as thermionic (hot) cathodes or as cold cathodes with an explosive or evaporative emission, and by their geometrical configuration as rod, button or well type cathodes. The anode is, in most cases, a passive component of the electrical circuit, collecting electrons from the arc, and the characterization of this current transfer is intimately coupled with the thermal and flow fields in the anode region, i.e. the anode boundary layer. The anode surface can be perpendicular or parallel to the arc axis and the flow. Since the arc electrode surface is necessarily in contact with the high temperature plasma, cooling is necessary and some erosion usually unavoidable. Means for controlling the arc - electrode interaction will be discussed concentrating on the use of fluid dynamics to influence the boundary layers. Recent theoretical and experimental results will be presented, which demonstrate the effectiveness of such approaches.


Articles with similar content:

ELECTRODE PHENOMENA IN DC ARCS AND THEIR INFLUENCE ON PLASMA TORCH DESIGN
Progress in Plasma Processing of Materials, 2003, Vol.0, 2003, issue
Joachim V. Heberlein
LARGE - AN INNOVATIVE PLASMA TORCH PRODUCING A SHEET-SHAPED PLASMA JET
Progress in Plasma Processing of Materials, 1999, Vol.1, 1999, issue
K. D. Landes, J. Zierhut, R. Hartmann
PARAMETRIC STUDY OF FOULING AND EXCESS HEAT TRANSFER AREA IN PLATE HEAT EXCHANGERS
Proceedings of an International Conference on Mitigation of Heat Exchanger Fouling and Its Economic and Environmental Implications, Vol.0, 1999, issue
H. U. Zettler , T. Kho, Hans Muller-Steinhagen
LOW ENERGY PLASMA HEAT TRANSFER AS APPLIED TO MICROELECTRONIC MANUFACTURING
Annual Review of Heat Transfer, Vol.12, 2002, issue 12
Portonovo S. Ayyaswamy, Ira M. Cohen
HEAT TRANSFER AND FLUID DYNAMICS PHENOMENA IN MOLTEN DROPLET-SURFACE INTERACTIONS
ICHMT DIGITAL LIBRARY ONLINE, Vol.4, 2001, issue
Dimos Poulikakos