Calculations of radiation transfer in SF<sub>6</sub>plasmas using the method of partial characteristics

Aubrecht, V.; Lowke, J. J.

doi:10.1088/0022-3727/27/10/013

Cited by 82 publications

(55 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Calculated radiation intensities, fluxes and divergence of fluxes for SF 6 arc plasmas with various temperature distributions were presented in our previous papers [3,4]. Similar results for argon arc plasma at pressures of 1, 5 and 10 atm are given in Figs.…”

Section: Resultssupporting

confidence: 77%

“…In our recent papers [3,4], we have used the approximate method of partial characteristics as formulated by Sevast'yanenko [5] for prediction of radiation intensities, radiation fluxes and the divergence of radiation fluxes for various temperature profiles of SF 6 arc plasmas. In this paper we applied the same method to the electric arc plasma in argon.…”

Section: Coefficients Of Absorptionmentioning

confidence: 99%

See 1 more Smart Citation

Calculation of radiative heat transfer in argon arc plasmas

Aubrecht

Bartlova

2000

Czech. J. Phys.

View full text Add to dashboard Cite

Radiation emission and absorption in arc plasmas are important energy transfer processes. Exact calculations, though possible in principle, are usually impossible in practice because of the need to treat a large number of spectral lines and also the continuum radiation in the whole spectrum range. Recently, we have used an approximate method of partial characteristics to evaluate the radiation intensities, radiation fluxes and the divergence of radiation fluxes for SF6 arc plasma with cylindrical symmetry. In this paper, we have extended our calculations to argon arc plasmas for the plasma pressures of 0.1, 0.5 and 1.0 MPa. We have calculated the coefficients of absorption for Ar plasmas at temperatures from 300 to 35 000 K, and have used these coefficients to calculate the partial characteristics. Both the continuum and the line spectra have been included in calculations. We have taken into account the radiative photo-recombination and bremsstrahlung for the continuous spectrum, and over 500 spectral lines for the discrete spectra.The method of partial characteristics has been applied to three-dimensional calculations of radiative heat transfer -i.e. radiation intensity, radiation flux and its divergence -in simplified temperature profiles. Conclusions have been made concerning validity and utilization of the method of partial characteristics in general gas dynamics problems. Coefficients of absorptionPrediction of both radiation emission and absorption requires data of the continuum and the line spectra, respectively. The spectral coefficients of absorption (absorptivity) need to be calculated as a function of radiation frequency in the whole spectral range, from the infrared to the far ultraviolet region.Absorptivity is proportional to the concentration of the chemical species occurring in the plasma. In the present paper, the pure Ar plasma is assumed as a mixture of Ar atoms, Ar + , Ar ++ , Ar +++ , Ar ++++ ions and electrons, according to the Fig. 1. Concentrations of each species were taken from [1].Both line and continuum radiation were considered in calculations of absorption coefficients. Photorecombination radiation and 'bremsstrahlung' radiation contribute to the continuous spectrum. Semi-empirical formulae described in more detail in [2] were used for calculation of the continuum absorption coefficients.The absorptivity for each spectral line depends on the line shape. The fine multiplet structure and the lines overlapping should also be taken into account in

show abstract

Section: Resultssupporting

confidence: 77%

Section: Coefficients Of Absorptionmentioning

confidence: 99%

Calculation of radiative heat transfer in argon arc plasmas

Aubrecht

Bartlova

2000

Czech. J. Phys.

View full text Add to dashboard Cite

show abstract

“…In this case is the Planck averaging useful? An answer to this question can be found analysing figure 15 representing the evolution of the absorption coefficient for Band 4 (zoom of figure 8 for this band or interval) at P = 1 bar and T = 300 K, and indicating three values of mean absorption previously defined by relations (10,(12)(13). and approximated values obtained using 7 new bands with the Planck mean absorption coefficients for T>6000K and normal mean absorption coefficients for T<6000 K.…”

Section: Mean Absorption Coefficient: First Resultsmentioning

confidence: 99%

“…For SF 6 the Som and ΔSim terms have been computed by Aubrecht and Lowke [10] and by Raynal et al [6;11].…”

Section: -Introductionmentioning

confidence: 99%

Improvements of radiative transfer calculation for SF₆ thermal plasmas

Randrianandraina

Cressault

Gleizes

2011

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

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.

show abstract

“…For example, this method has been successfully used in some previous papers (19)(20) for the prediction of radiation intensities, and H 2 O (several transitions) were also brought about. (21) Absorption coefficient as a function of wavelength was calculated from infrared to far ultraviolet regions and the tables of partial characteristics for 1,000 -35,000 K.…”

Section: Physical Modelmentioning

confidence: 99%

The Influence of Turbulence on Characteristics of a Hybrid-Stabilized Argon-Water Electric Arc

Jenista

Takana

Nishiyama

et al. 2013

JTST

View full text Add to dashboard Cite

The paper presents numerical simulations of the discharge and near outlet regions of the hybrid-stabilized argon-water electric arc. Calculations were carried out for the assumption of laminar and turbulent plasma flow models, respectively. Results of calculations for currents 300-600 A show that the influence of turbulence is weak and the maximum difference for all the monitored physical quantities is less than 10%. Comparison with available experiments exhibits good agreement.

show abstract

Calculations of radiation transfer in SF₆plasmas using the method of partial characteristics

Cited by 82 publications

References 22 publications

Calculation of radiative heat transfer in argon arc plasmas

Calculation of radiative heat transfer in argon arc plasmas

Improvements of radiative transfer calculation for SF₆ thermal plasmas

The Influence of Turbulence on Characteristics of a Hybrid-Stabilized Argon-Water Electric Arc

Contact Info

Product

Resources

About

Calculations of radiation transfer in SF6plasmas using the method of partial characteristics

Cited by 82 publications

References 22 publications

Calculation of radiative heat transfer in argon arc plasmas

Calculation of radiative heat transfer in argon arc plasmas

Improvements of radiative transfer calculation for SF6 thermal plasmas

The Influence of Turbulence on Characteristics of a Hybrid-Stabilized Argon-Water Electric Arc

Contact Info

Product

Resources

About

Calculations of radiation transfer in SF₆plasmas using the method of partial characteristics

Improvements of radiative transfer calculation for SF₆ thermal plasmas