München 2019 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 4: Atmospheric Pressure Plasmas I
P 4.5: Vortrag
Montag, 18. März 2019, 15:15–15:30, HS 20
Energy flux measurements in atmospheric pressure plasmas — •Luka Hansen1, Kristian Reck1, Stephan Reuter2, and Holger Kersten1 — 1Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 2Department of Computer and Electrical Engineering, Lublin University of Technology, Lublin, Poland
Passive thermal probes (PTPs) have been successfully used to diagnose energy dissipation in low pressure discharges relevant for plasma surface interaction in e.g. film growth, and surface cleaning and activation. The present work implements PTP diagnostics to study plasma surface interaction at atmospheric pressure, where mass transport by convection and diffusion plays an important role for the energy transfer. The gained insight may proof useful for many industrial and biomedical applications.
Measurements on a surface barrier discharge (DSCBD) and on a cold atmospheric pressure plasma jet (CAPjet) are presented to show the role of fluid dynamics on the energy flux. Variation of the working gas for the DCSBD demonstrate the influence of gas- and surface reactivity on the energy flux. For the CAPjet, first time Rayleigh measurements of flow regime in combination with the PTP measurements show the effect of laminar vs. turbulent flow on energy dissipation. Charging of the (biased) PTP by the impinging jet with varying gas composition and flow indicate that Penning ionization and ion recombination time scales are relevant factors for the energy transfer from the plasma to surface.