Informace o publikaci

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

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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

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Plasma Sources Science and Technology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://iopscience.iop.org/article/10.1088/1361-6595/ac56c5
Doi http://dx.doi.org/10.1088/1361-6595/ac56c5
Klíčová slova carbon dioxide conversion; fluid model; microwave plasma; discharge contraction
Popis 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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