Net emission coefficient for CO–H2 thermal plasmas with the consideration of molecular systems

Billoux, Tommy; Cressault, Yann; Gleizes, Alain

doi:10.1016/j.jqsrt.2015.07.011

Cited by 12 publications

(7 citation statements)

References 97 publications

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“…The derivation of the net emission coecient ϵ N requires to rst compute the spectrum of the absorption coecient k ′ ν . This is achieved thanks to the recent work of T. Billoux [8]. It yields to a huge database with a temperature range from 300 to 30.000 K and wavelengths from 0.209 µm to infrared, as shown in gures 2 and 3 (database provided by the LAPLACE laboratory).…”

Section: Net Emission Coecientmentioning

confidence: 99%

“…The approach developed in this paper is crucial when one is willing to derive the current/voltage characteristic of the arc, for a better specication of the power supply at very high pressure. A particular attention is paid to the radiative heat transfer through costly but precise computations of the absorption coecients [8] used in net emission coecient (NEC) method. As in most numerical approaches, physical parameters must be assigned denite values before the program can be run.…”

Section: Introductionmentioning

confidence: 99%

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A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

Gueye

Cressault

Rohani

et al. 2017

Journal of Applied Physics

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International audienceThis paper focuses on the modeling of a hydrogen arc column at very high pressure (20 bar). The problem is solved from Elenbaas-Heller equation where the radiation is carefully considered with the net emission coefficient. The absorption spectrum requires the integration of background continuum, molecular bands, and line spectra. This work directly aims to predict the electric current-voltage characteristics which is key for the design of new processes. We propose also a new analytic solution which generalizes the channel model of electric arc to the case when the volume radiation makes a significant contribution to the energy balance. The presented formalism allows a better determination of the plasma thickness parameter Rp for net emission coefficient method in cylindrical arcs and gives satisfactory results in comparison to earlier experimental works on high pressure hydrogen plasma

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Section: Net Emission Coecientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

Gueye

Cressault

Rohani

et al. 2017

Journal of Applied Physics

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“…The atmospheric properties of these objects are known to be strongly influenced by the spectra of the molecules they contain. On Earth, spectra of hot molecules are observed in flames [4,5], discharge plasmas [6,7], explosions [8] and in the hot gases emitted, for example, from smoke stacks [9]. In addition, high-lying states can be important in non local thermodynamic equilibrium (non-LTE) environments both in space, for example, emissions observed from comets [10,11], and on Earth.…”

Section: Introductionmentioning

confidence: 99%

The ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

Tennyson

Yurchenko

Al-Refaie

et al. 2016

Journal of Molecular Spectroscopy

449

316

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The ExoMol database (www.exomol.com) provides extensive line lists of molecular transitions which are valid over extended temperature ranges. The status of the current release of the database is reviewed and a new data structure is specified. This structure augments the provision of energy levels (and hence transition frequencies) and Einstein A coefficients with other key properties, including lifetimes of individual states, temperature-dependent cooling functions, Land? g-factors, partition functions, cross sections, k-coefficients and transition dipoles with phase relations. Particular attention is paid to the treatment of pressure broadening parameters. The new data structure includes a definition file which provides the necessary information for utilities accessing ExoMol through its application programming interface (API). Prospects for the inclusion of new species into the database are discussedPeer reviewe

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“…We are interested in the calculation of the radiative term in thermal plasmas composed of a mixture of hydrogen H 2 and carbon dioxide CO called syngas because it can be used for the production of synthetic natural gas or synthetic petroleum (Fischer-Tropsch process), ammonia or methanol. The key point is the derivation of the absorption coefficient spectrum, task which is achieved thanks to the work of Billoux et al [31]. More details can be found in that paper and the references therein.…”

Section: Few Words On Radiative Calculationmentioning

confidence: 99%

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

Gueye¹,

Cressault²,

Rohani³

et al. 2019

J. Phys. D: Appl. Phys.

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This paper focuses on the 3D MHD modeling of an arc plasma at industrial level; the torch is a 'Kvaerner-type' one, made of two concentric graphite electrodes and where spots are displaced with an external magnetic field. Different phenomenologies in arc movement were observed, ranging from a gliding arc on electrodes surfaces to hopping arc foots, agreeing with previous experimental works at atmospheric pressure. These dynamics have non-negligible consequences in the plasma process: the hopping mode induces more erosion due to a higher heat flux at the electrodes surfaces in comparison to the gliding arc; the latter mode results also in a strong gas swirling inside the torch, thus longer particles residence time is predicted.

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Net emission coefficient for CO–H2 thermal plasmas with the consideration of molecular systems

Cited by 12 publications

References 97 publications

A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

A simplified model for the determination of current-voltage characteristics of a high pressure hydrogen plasma arc

The ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

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