Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 4: Atmospheric Pressure Plasmas I

P 4.2: Talk

Monday, March 5, 2018, 14:30–14:45, KI 1.174

Influence of feed gas humidity and reactor geometry on surface dielectric barrier discharges — •Michael Schmidt, Manfred Kettlitz, and Markus Becker — INP Greifswald, Felix-Hausdorff-Straße 2, 17489 Greifswald

Surface dielectric barrier discharges (SDBDs) are widely used for coating, gas cleaning and treatment of liquids or as plasma actuators. To achieve high energy efficiency and for safety reasons, smooth electrical operation parameters like low amplitudes and frequencies are desirable. The applicability of frequencies < 1 kHz and high voltage amplitudes < 7 kV for SDBDs in air is investigated in the presented study. It is found that the feed gas humidity has a substantial influence on the chemical activity of the plasma as well as on the electrical behavior of the discharge. Additionally, it is found that the reactor geometry and hence the flow properties of the feed gas also influences the performance of the SDBD significantly. The study shows that under dry conditions a large reactor volume, where only a small part of the feed gas is replaced continuously, has a higher chemical activity, measured by production of ozone, compared to a smaller reactor volume. However, the influence of the feed gas humidity is much stronger for the large reactor volume than for the smaller one. This is shown by power input into the plasma, plasma distribution throughout the SDBD and ozone production.