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Poster Session II

4:30 pm – 6:30 pm, Wednesday October 15 Session DW5 COEX, Lobby E
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Modelling and experimental investigation of microdischarges in zinc metal vapour

Poster 27
Presenter: Margarita Baeva (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany)
Authors: Aleksandar P. Jovanović (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany), Ralf Methling (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany), Dominik Bratek (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany), Niklas Schüler (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany), Carsten Uber (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany), Dirk Uhrlandt (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany)

This contribution presents complementary modelling and experimental studies of microdischarges in Zn vapour, which are potential sources of gas ignition in flammable atmospheres. The microdischarge in Zn vapour is simulated by a time-dependent one-dimensional unified non-equilibrium model at a constant current of 60 mA and varying the gap lengths to mimic the contact opening in the experiment. The model resolves the spatial structure of the discharge within the gap, enabling us to assess basic plasma parameters, such as electric potential, local temperatures of electrons and heavy particles, number densities of relevant excited states. It further allows us to indicate the main heating processes and the released heat, which is crucial for a thermochemical gas ignition. The model predicts the linear dependence of the voltage on the gap length in agreement with the experiment and identifies the Joule heating as the main heating component. The emission spectrum acquired by optical emission spectroscopy is qualitatively reproduced by the model.

Funding acknowledgement

This work was funded by the Deutsche Forschungsgemeinschaft (DFG) — project number 411446115.

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