Net emission coefficient of radiation in SF<sub>6</sub>arc plasmas

Aubrecht, V.; Gross, B.

doi:10.1088/0022-3727/27/1/014

Cited by 36 publications

(27 citation statements)

References 7 publications

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“…In our work, we use line by line integration, respecting the overlapping. It was reported in our previous paper [19] that neglecting the line overlapping gives higher net emission coefficients by up to 70%.…”

Section: Airmentioning

confidence: 67%

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Aubrecht

Bartlova

2008

Plasma Chem Plasma Process

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Net emission coefficients of radiation were calculated for isothermal plasmas of air and SF 6 as a function of the plasma temperature 5,000-30,000 K and the arc radius (0.01-10 cm) at various plasma pressures. Calculations take into account continuum and line radiations, special attention has also been taken to influence of molecular species in case of the air plasmas. It has been found that the molecular bands of O 2 , N 2 , N 2 ? , NO and NO ? have very strong effect on the net emission coefficients at low temperatures (below 10,000 K). In case of SF 6 , effect of PTFE admixture on the net emission coefficients was also studied. It follows from the calculations that the net emission coefficients vary very little with various admixtures of PTFE. Values of net emission coefficients if SF 6 plasma calculated for various spectral regions were compared.

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Section: Airmentioning

confidence: 67%

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Aubrecht

Bartlova

2008

Plasma Chem Plasma Process

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“…We have plotted in figure 3 the photo-absorption cross sections of SF 6 , SF 4 and F 2 , given by literature and used in our calculation, versus the wavelength of the absorbed photon. For SF 6 we have made a compilation of 4 papers [28][29][30][31] So the literature data cover only a part of the spectrum and should be extrapolated.…”

Section: -Basic Data For the Radiative Spectrum Of Sf 6 Plasmasmentioning

confidence: 99%

“…This NEC was initially proposed by Lowke [1] and first calculated for SF 6 by Liebermann and Lowke [2]. Since this pioneer work, other teams have been calculating the NEC for SF 6 [3][4] and several works demonstrated the interest in and accuracy of this coefficient for calculating the temperature field in arcs [5] introducing a multiplying factor [6][7].…”

Section: -Introductionmentioning

confidence: 99%

Improvements of radiative transfer calculation for SF₆ thermal plasmas

Randrianandraina

Cressault

Gleizes

2011

J. Phys. D: Appl. Phys.

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We present a comparison between an exact calculation of radiative transfer in SF6 thermal plasma based on a fine description of the spectrum with 300 000 spectral points for each temperature value, for simplified conditions (1D and 2D geometries with imposed symmetrical temperature profiles and local thermodynamic equilibrium) and two kinds of approximated calculations. The first is the classical net emission coefficient largely used in arc modelling. The second one is based on a very simplified spectral description with only seven intervals assuming a grey body condition within each interval and using the Planck and the Rosseland averaging for deducing the mean absorption coefficient (MAC). At high temperature the use of the Rosseland averaging is not satisfactory. The other two approximated methods (net emission and the Planck averaging) are acceptable but the radiative flux is in general not very accurate. The radiative transfer calculation can be improved following three ways: a better knowledge of the basic processes and in particular of the absorption coefficients for diatomic and polyatomic molecules, the use of different definitions of MACs (Planck averaging at high temperature and mean natural value at low temperature) and a careful choice of the spectral intervals.

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“…In addition, Coulomb field approximation with L-S or j-l coupling schemes [2,6,7] has been used for prediction of non-tabulated f values. For each spectral line we have calculated the values of half-widths and spectral shifts [11]. Spectral lines having value of the oscillator strength higher than 0.001 have been finally taken into consideration.…”

Section: Line Radiationmentioning

confidence: 99%

Radiation absorption coefficients in arc plasmas

Aubrecht

Bartlova

2004

Czech. J. Phys.

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In the present paper, attention is given to the calculation of spectral coefficients of absorption and their comparisons with other sources of data for various types of the arc plasmas. The coefficients of absorption have been calculated for various kinds of arc plasmas (sulphur hexafluoride, hydrogen, oxygen) at different plasma temperatures and pressures above 1 bar. Photon absorption cross sections have been calculated using an approximation method of quantum defect. For the contributions from the line radiation, oscillator line strengths, widths and shifts of neutral and ionized atoms have been calculated using semi-empirical formulas. Curves are given for the absorption coefficients of radiation for wavelengths of 10 to 3000 nm. PACS: 52.25.Os

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Net emission coefficient of radiation in SF₆arc plasmas

Cited by 36 publications

References 7 publications

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Improvements of radiative transfer calculation for SF₆ thermal plasmas

Radiation absorption coefficients in arc plasmas

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Net emission coefficient of radiation in SF6arc plasmas

Cited by 36 publications

References 7 publications

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Net Emission Coefficients of Radiation in Air and SF6 Thermal Plasmas

Improvements of radiative transfer calculation for SF6 thermal plasmas

Radiation absorption coefficients in arc plasmas

Contact Info

Product

Resources

About

Net emission coefficient of radiation in SF₆arc plasmas

Improvements of radiative transfer calculation for SF₆ thermal plasmas