Publication details

Charged particle kinetics and gas heating in CO2 microwave plasma contraction: comparisons of simulations and experiments

Authors

VIALETTO Luca VAN DE STEEG Alex ARSÉNIO NUNES ALEIXO VIEGAS Pedro LONGO Savino VAN ROOIJ Gerardus VAN DE SANDEN Richard VAN DIJK Jan DIOMEDE Paola

Year of publication 2022
Type Article in Periodical
Magazine / Source Plasma Sources Science and Technology
MU Faculty or unit

Faculty of Science

Citation
Web https://iopscience.iop.org/article/10.1088/1361-6595/ac56c5
Doi http://dx.doi.org/10.1088/1361-6595/ac56c5
Keywords carbon dioxide conversion; fluid model; microwave plasma; discharge contraction
Description This work investigates kinetics and transport of CO2 microwave plasmas through simulation results from a 1D radial fluid model and experiments. Simulation results are validated against spatially resolved measurements of neutral species mole fractions, gas temperature, electron number density and temperature obtained by means of Thomson and Raman scattering diagnostics, yielding good agreement. As such, the model is used to complement experiments and assess the main chemical reactions, mass and energy transport in diffuse and contracted plasma regimes. From model results, it is found that, as pressure is raised, the inhomogeneous gas heating induces significant gradients in neutral and charged species mole fractions profiles. Moreover, the transition from diffuse to contracted plasma is accompanied by a change in the dominant charged species, which favours electron–ion recombination over dissociative attachment. Associative ionization rates increase in the plasma core from diffuse to contracted regime. These processes contribute to the increase in the peak electron number density with pressure, that determines radial plasma contraction.
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