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P: Fachverband Plasmaphysik

P 3: Atmospheric Pressure Plasmas and their Applications I

P 3.1: Hauptvortrag

Montag, 30. August 2021, 16:30–17:00, H6

An overview of the theoretical description and modelling of low-current arcs at small gap distances — •Margarita Baeva — Leibniz Institute for Plasma Science and Technology, Greifswald, Germany

This contribution will present the achievements of a three-year research project that was concerned with the development of a unified non-equilibrium modelling of direct current electric arcs of short lengths at low currents. Such arcs are currently considered as promising tools in material processing. They are also encountered in switching devices among others.

A thorough analysis of the physical processes and arc plasma properties were carried out in order to provide knowledge about the spatial structure of the arc when the arc length was reduced to only a few millimeters and below one millimeter, and the electric current amounted a few Amperes. Results will be presented that demonstrate the arc-electrode interaction over different arc lengths, the spatial extension of the regions of space charge, and how these regions change when the arc length becomes minuscule. The challenges in modelling of short arcs between melting electrodes will be discussed.

The potentials and limitations of the modelling approach will be considered with respect to further developments.

The project on modelling of microarcs is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 390828847.