Greifswald 2024 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 24: Codes and Modeling II

P 24.3: Vortrag

Donnerstag, 29. Februar 2024, 17:15–17:30, ELP 6: HS 4

Modelling study of the effects of gas temperature on self-pulsing spark discharges in atmospheric-pressure argon — •Aleksandar P. Jovanović¹, Hans Höft¹, Detlef Loffhagen¹, Markus M. Becker¹, and Torsten Gerling^{1, 2, 3} — ¹Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany — ²Kompetenzzentrum Diabetes Karlsburg (KDK), Karlsburg, Germany — ³ZIK plasmatis, Greifswald, Germany

Self-pulsing discharges, such as transient sparks, are commonly used to generate non-thermal atmospheric pressure plasmas. Although the self-pulsing prevents excessive gas heating and thermalisation of the discharge, gas might still heat to some extent. The increase in gas temperature could alter the discharge stability and the characteristics of the plasma, such as mode transitions and the excitation of ion acoustic waves. In the present contribution, the self-pulsing discharges in argon at atmospheric pressure are analysed by means of a fluid-Poisson model coupled with a circuit equation. The effects of gas heating on the discharges and self-pulsing modes are investigated by treating the gas temperature as a parameter in the model and by coupling a heat equation for the background gas to the fluid-Poisson model. The modelling results show that higher gas temperatures affect both the frequency and the periodicity of the discharges, noting that the change in gas density has the most significant influence, while temperature-dependent collisional processes play a minor role.

Funded by the Deutsche Forschungsgemeinschaft (DFG) – project number 466331904.

Keywords: fluid model; self-pulsing discharge; gas heating