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P: Fachverband Plasmaphysik
P 10: Atmospheric Pressure Plasmas and their Applications II
P 10.6: Vortrag
Dienstag, 27. Februar 2024, 15:30–15:45, WW 1: HS
Electrical Characterization and Imaging of the Discharge Morphology in a Small Scale Coaxial Packed Bed Dielectric Barrier Discharge — •Rezvan Hosseini Rad1, Volker Brüser1, and Ronny Brandenburg1,2 — 1Leibniz Institute for Plasma Science and Technology, Felix-HausdorffStraße 2, 17489 Greifswald, Germany — 2University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany
Packed Bed Dielectric Barrier Discharges (PB-DBDs) are gaining widespread attention due to direct interaction between plasma and catalyst, resulting in enhanced product selectivity in gas processing. In this contribution, a small scale coaxial DBD reactor, enabling the end-on view observation of the discharge gap, has been constructed. The primary objective is to correlate electrical measurements such as voltage-charge (V-Q) plots with the plasma morphology in PB-DBD for different pressures, gas compositions, packing materials and applied voltage amplitudes. Simultaneous imaging and V-Q plot analysis, with special attention to parasitic capacitances, result in the revision of equivalent circuit for PB-DBDs and a more accurate experimental determination of the key capacitance values, namely the cell capacity (Ccell), and effective dielectric capacity (ζdiel). Additionally, the analysis includes the role of parasitic discharges, which can lead to the overestimation of input power. We aim to enhance the understanding of PB- DBDs, to provide sound knowledge about the power input and penetration of the flowing gas by active plasma.
Keywords: electrical characterization,; parasitic capacitances,; packed bed dielectric barrier discharge,; plasma catalyst