Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Atmospheric-pressure plasma and applications 2
P 7.1: Hauptvortrag
Dienstag, 10. März 2020, 11:00–11:30, b305
Simulation of microarcs: challenges and perspectives — •Margarita Baeva1, Detlef Loffhagen1, Markus M. Becker1, Erwan Siewert2, and Dirk Uhrlandt1 — 1Leibniz Institute for Plasma Science and Technology, 17489 Greifswald, Germany — 2Linde AG, Geschäftsbereich Linde Gas, 85716 Unterschleissheim, Germany
Microarcs are generated on sub-millimetric scale. They are encountered in switching devices and are currently considered as promising tools in material processing. Experiments on microarcs are extremely difficult so that modelling can be seen as an alternative for their characterization. Studies on microarcs can greatly contribute to the overall arc plasma modelling. In particular, a unified numerical modelling of microarcs opens the opportunity to clarify questions of fundamental importance: to what extent do arc column and near-electrode regions interact with each other over different arc lengths; is the division of the arc plasma into sub-regions relevant to short-length arcs; what is the extension of the regions with considerable space-charge; how do the near-electrode regions change in space; do cathode and anode boundary regions merge when the arc length becomes minuscule. Results of a recent unified model of microarcs will be presented and discussed along with those obtained by means of a fully non-equilibrium approach, in which the space charge sheaths are so far unresolved.
The project on modelling of microarcs is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 390828847.