Fundamental Aspects of Plasma Chemical Physics

Capitelli, M.; Colonna, Gianpiero; D’Angola, A.

doi:10.1007/978-1-4419-8182-0

Cited by 107 publications

(116 citation statements)

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“…In performed investigations, we assumed that microwave plasma at atmospheric pressure is generally in partial local thermodynamic equilibrium [13,14,[18][19][20]. This assumption allowed us to use the Boltzmann plot method to determine the T exc [14,15].…”

Section: Resultsmentioning

confidence: 99%

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Characterization of an Atmospheric-Pressure Argon Plasma Generated by 915 MHz Microwaves Using Optical Emission Spectroscopy

Miotk

Hrycak

Jasiński

et al. 2017

Journal of Spectroscopy

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The paper presents the investigations of an atmospheric-pressure argon plasma generated at 915 MHz microwaves using the optical emission spectroscopy (OES). The 915 MHz microwave plasma was inducted and sustained in a waveguide-supplied coaxial-linebased nozzleless microwave plasma source. The aim of presented investigations was to estimate parameters of the generated plasma, that is, excitation temperature of electrons T exc , temperature of plasma gas T g , and concentration of electrons n e . Assuming that excited levels of argon atoms are in local thermodynamic equilibrium, Boltzmann method allowed in determining the T exc temperature in the range of 8100-11000 K. The temperature of plasma gas T g was estimated by comparing the simulated spectra of the OH radical to the measured one in LIFBASE program. The obtained T g temperature ranged in 1200-2800 K. Using a method based on Stark broadening of the H β line, the concentration of electrons n e was determined in the range from 1.4 × 10 15 to 1.7 × 10 15 cm −3, depending on the power absorbed by the microwave plasma.

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Section: Resultsmentioning

confidence: 99%

“…The plasma was induced by microwaves at a frequency of 915 MHz in waveguide-supplied coaxialline-based nozzleless MPS [1]. The presented device allows the generation of so-called cold plasma which is classified as a partial local thermodynamic equilibrium (PLTE) plasma [13,14,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Characterization of an Atmospheric-Pressure Argon Plasma Generated by 915 MHz Microwaves Using Optical Emission Spectroscopy

Miotk

Hrycak

Jasiński

et al. 2017

Journal of Spectroscopy

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“…The number of accounted electronic energy levels is determined by the so called cut-off criteria, which usually contain the factor of lowering the ionization energy due to the presence of charged particles. 34 In the present study, we use the criteria suggested in Ref. 35: e c n E c À DE c , where E c is the ionization energy and the above mentioned lowering factor DE c is set to 1000 cm À1 .…”

Section: Governing Equationsmentioning

confidence: 99%

Transport coefficients and heat fluxes in non-equilibrium high-temperature flows with electronic excitation

Истомин

Кустова

2017

Physics of Plasmas

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The influence of electronic excitation on transport processes in non-equilibrium high-temperature ionized mixture flows is studied. Two five-component mixtures, N 2 =N þ 2 =N=N þ =e À and O 2 =O þ 2 =O=O þ =e À , are considered taking into account the electronic degrees of freedom for atomic species as well as the rotational-vibrational-electronic degrees of freedom for molecular species, both neutral and ionized. Using the modified Chapman-Enskog method, the transport coefficients (thermal conductivity, shear viscosity and bulk viscosity, diffusion and thermal diffusion) are calculated in the temperature range 500-50 000 K. Thermal conductivity and bulk viscosity coefficients are strongly affected by electronic states, especially for neutral atomic species. Shear viscosity, diffusion, and thermal diffusion coefficients are not sensible to electronic excitation if the size of excited states is assumed to be constant. The limits of applicability for the Stokes relation are discussed; at high temperatures, this relation is violated not only for molecular species but also for electronically excited atomic gases. Two test cases of strongly non-equilibrium flows behind plane shock waves corresponding to the spacecraft re-entry (Hermes and Fire II) are simulated numerically. Fluid-dynamic variables and heat fluxes are evaluated in gases with electronic excitation. In inviscid flows without chemical-radiative coupling, the flow-field is weakly affected by electronic states; however, in viscous flows, their influence can be more important, in particular, on the convective heat flux. The contribution of different dissipative processes to the heat transfer is evaluated as well as the effect of reaction rate coefficients. The competition of diffusion and heat conduction processes reduces the overall effect of electronic excitation on the convective heating, especially for the Fire II test case. It is shown that reliable models of chemical reaction rates are of great importance for accurate predictions of the fluid dynamic variables and heat fluxes. Published by AIP Publishing. [http://dx

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“…[46]). In this respect, the modeling via GEMS of atom-diatom chemical reactions is not only key to the progress in plasmas' investigations (because vicarial of unfeasible experimental measurements [47]) but it is also the driving force of the evolution of GEMS and of its ability to both enhance competitive/cooperative massive computational campaigns grounded on QoS and QoU and urge the selective bridging between HTC and HPC platforms.…”

Section: A Workflow-enabled Prototypementioning

confidence: 99%