Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 18: Atmospheric Pressure Plasmas and their Applications IV
P 18.3: Talk
Wednesday, February 28, 2024, 17:15–17:30, WW 1: HS
Impact of admixtures of H2O on the properties of a He jet plasma — •Tao Zhu1, Margarita Baeva1, Florian Sigeneger1, Peter Bruggeman2, and Shubham Dongawar2 — 1Leibniz Institute for Plasma Science and Technology, Greifswald, Germany — 2Department of Mechanical Engineering, University of Minnesota
Low temperature He plasma containing admixtures of H2O is currently investigated by modelling and experiments related to plasma catalysis in confined spaces in automotive exhaust. The RF plasma jet is operated in a capillary at atmospheric pressure at a power of a few watts. A global model describes the plasma chemistry and the gas heating. The model is extended to a plug flow model, which converts the temporal evolution of a volume element flowing with the gas into a spatial distribution. A power density profile is defined in the active region between the RF electrodes. This model provides the species densities, the electron mean energy and gas temperature. Experiments based on laser induced fluorescence deliver the density of OH radicals and the gas temperature. A fair agreement was found between modelling and experiments for two power values. The model delivered values of about 5e18 m-3 for the electron density and about 2.5 eV for the electron mean energy which are hardly influenced by the H2O admixture. The analysis of the dominant gain and loss processes of OH revealed pronounced changes of contributions from electron and heavy particle reactions depending on the power.
This work was supported by the DFG-NSF project 509169873.
Keywords: RF plasma; He; H2O; plug flow; chemical reaction