The reattachment process in nonequilibrium arc simulations

The reattachment process is an essential part of the dynamics of thermal plasma flows. Simulations of the flow inside a direct-current arc plasma torch performed with a two-temperature model produce a reattachment process triggered by local flow instabilities and driven by local high electric fields...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2008-08, Vol.36 (4), p.1024-1025
Main Authors: Trelles, J.P., Heberlein, J.V.R., Pfender, E.
Format: Article
Language:English
Subjects:
Anodes
Arc reattachment
Breakdown
Computer simulation
Dynamics
Electric breakdown
Electric fields
Electron temperature
Electrons
finite element method
Finite element methods
Gas flow
Instability
Local flow
Mathematical models
non-equilibrium
Plasma
Plasma properties
Plasma simulation
Plasma temperature
plasma torch
Simulation
thermal plasma
Thermal plasmas
Thermal spraying
Thermodynamics
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Description
Summary:The reattachment process is an essential part of the dynamics of thermal plasma flows. Simulations of the flow inside a direct-current arc plasma torch performed with a two-temperature model produce a reattachment process triggered by local flow instabilities and driven by local high electric fields and electron temperatures. These results indicate that an arc reattachment can occur not only due to a breakdown of the gas surrounding the plasma but also due to the macroscopic characteristics of the flow, and these emphasize the importance of nonlocal thermodynamic equilibrium-based models to properly describe arc dynamics.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2008.922420