Vibrational excitation cross sections for non-equilibrium nitric oxide-containing plasma

Laporta, V.; Vialetto, Luca; Guerra, Vasco

doi:10.1088/1361-6595/ac6a0f

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…The same angular scattering model has also been used for electron rotational excitation in NO [94] and H 2 O [95]. The DCS for a quadrupole moment can be derived in a similar way, and was found to be isotropic in the first-order approximation [96].…”

Section: Inelastic Collisionsmentioning

confidence: 99%

A tutorial overview of the angular scattering models of electron–neutral, ion–neutral, neutral–neutral, and Coulomb collisions in Monte Carlo collision modeling on low-temperature plasma

Yang

2024

Plasma Sources Sci. Technol.

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Over the past decade, massive modeling practices on low temperature plasma reveal that input data such as microscopic scattering cross sections are crucial to output macroscopic phenomena. In Monte Carlo collision (MCC) modeling on natural and laboratory plasma, angular scattering model is a non-trivial topic. Conforming to the pedagogical purpose of this overview, the classical and quantum theories of binary scattering, such as the commonly used Born-Bethe approximation are first introduced. Adequate angular scattering models, which MCC simulation can handle as input, are derived based on the above theories for electron-neutral, ion-neutral, neutral-neutral, and Coulomb collisions. The tutorial is not aiming to provide accurate cross section data by modern approaches in quantum theory, but to introduce analytical angular scattering models from classical, semi-empirical, and first-order perturbation theory. The reviewed models are expected to be readily incorporated into the MCC codes, in which scattering angle is randomly sampled through analytical inversion instead of numerical accept-reject method. Those simplified approaches are very attractive, and demonstrate in many cases the ability to achieve a striking agreement with experiments. Energy partition models on electron-neutral ionization are also discussed with insight from the binary-encounter-Bethe theory. This overview is written in a tutorial style, in order to serve as a guide for novice in this field, and at the same time as a comprehensive reference for practitioners in MCC modeling on plasma.

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Section: Inelastic Collisionsmentioning

confidence: 99%

A tutorial overview of the angular scattering models of electron–neutral, ion–neutral, neutral–neutral, and Coulomb collisions in Monte Carlo collision modeling on low-temperature plasma

Yang

2024

Plasma Sources Sci. Technol.

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Effect of multi-temperature models on heat transfer and electron behavior in hypersonic flows

Kim,

Yang

et al. 2024

Physics of Fluids

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In hypersonic computational fluid dynamics, the two-temperature (2-T) model is widely used to simulate thermochemical nonequilibrium. The 2-T model incorporates translational-rotational and electron-electronic-vibrational energies, assuming that the integrated energies have the equivalent temperature. In this study, multi-T models are constructed to accurately predict the effects on heat flux and free electrons due to the separation of energy modes under hypersonic environments. The three-temperature (3-T) model separates the electron-electronic energy from the electron-electronic-vibrational energy of the 2-T model. The 3-T model can accurately predict the distribution and temperature of free electrons by separating the energy of free electrons, which has different characteristics from heavy particles. The four-temperature model treats rotational energy as a nonequilibrium energy mode, distinct from translational-rotational energy. While the rotational temperature reaches equilibrium rapidly at low temperatures, at high-temperature regime rotational temperature shows a relaxation time similar to that of vibrational temperature, which cannot be ignored. To develop multi-T models, electron-vibrational relaxation and translational-rotational relaxation, which are omitted in the 2-T model, are considered. Various flight test and ground facility conditions are analyzed to verify the effects of electron and heat flux under circumstances that include shock, expansion, and shock wave boundary layer interaction. The results of the multi-T models show significant differences in electron temperature and distribution caused by electron-electronic nonequilibrium. Additionally, rotational nonequilibrium increases the shock standoff distance and alters the electron distribution at high altitudes. The heat flux difference across multi-T models is found to be negligible, except in the high degree of ionization condition.

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Vibrational excitation cross sections for non-equilibrium nitric oxide-containing plasma

Cited by 2 publications

References 54 publications

A tutorial overview of the angular scattering models of electron–neutral, ion–neutral, neutral–neutral, and Coulomb collisions in Monte Carlo collision modeling on low-temperature plasma

A tutorial overview of the angular scattering models of electron–neutral, ion–neutral, neutral–neutral, and Coulomb collisions in Monte Carlo collision modeling on low-temperature plasma

Effect of multi-temperature models on heat transfer and electron behavior in hypersonic flows

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