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P: Fachverband Plasmaphysik

P 4: Atmospheric Pressure Plasmas I

P 4.6: Vortrag

Montag, 5. März 2018, 15:30–15:45, KI 1.174

Inception and Propagation of Pulsed Corona-like Discharges in Water — •Raphael Rataj, Tilo Schulz, and Juergen F. Kolb — Leibniz Institute for Plasma Science and Technology e.V., Felix-Hausdorff-Strasse 2, 17489 Greifswald, Germany

The potential of corona-like discharges in the liquid-phase for the treatment of sewage water was shown recently in chemical investigations on the degradation of pharmaceutical residues. However, the energy efficiency of this plasma treatment seems to be higher for the generation with short high voltage pulses. In particular discharges instigated with sub-microsecond high-voltage pulses were suggested.

A high-voltage Blumlein-line pulse generator for the application of defined 100-ns pulses was developed and connected to a plasma chamber with a point-to-half-sphere geometry. Single rectangular pulses were applied to the plasma reactor, which was operated with a continuous water flow. Plasma inception voltage and streamer propagation was investigated for different water conductivities, gap distances and pulse amplitudes.

First results show that neither electrode distance nor liquid conductivity have an impact on the streamer propagation lengths. For such short pulses in particular no stop-length could be identified. Detailed inception characteristics and plasma propagation behaviour are topic of the current research and will be presented.