Modelling of Radiative Transfer in Air Arc Plasma

Bartlova, Milada; Kloc, Petr; Bogatyreva, N.; Aubrecht, V.; Pokorný, Jan

doi:10.14311/ppt.2017.3.261

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…In general, the results show that NEC (R = 1 mm) is a good choice for the models of the free-burning arc and the DC torch. Since the data set for the spectral absorption coefficient employed in this work differs from that in [9], in particular in the number of spectral lines, the present results also differ in some extend. As a matter of fact, the Q r values in the hottest region of the DC torch are by a factor of two lower in the present work than in [9] although maximum plasma temperature of about 27200 K is obtained in both works.…”

Section: Resultsmentioning

confidence: 63%

“…The number of frequency intervals and their boundaries are chosen with respect to the behaviour of the absorption coefficient. Five intervals with boundaries 0.003, 1.0, 2.8, 3.8, 6.67, and 10.0 in units of 10 15 Hz as reported in [5] are used in the present work. The evaluation of the spectral absorption coefficient κ ν in each interval of frequencies [ν i , ν i+1 ] can be performed applying Plank (κ P ) or Rosseland (κ R ) averaging [2] or a combination of both (κ h ) that leads to a hybrid mean value [3].…”

Section: Physical Backgroundmentioning

confidence: 99%

“…The frequency range (1•10 11 −1.2•10 16 ) Hz is divided by 1199991 frequencygrid points to ensure a step of 10 10 Hz. Notice that the data used in this work differs from that in [9]. An analysis of the influence of the database on the model's predictions will be considered in a forthcoming work.…”

Section: Physical Backgroundmentioning

confidence: 99%

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Radiative Heat Transfer in Models of DC Arc Plasma

Baeva,

Kloc,

Cressault

2023

PPT

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The radiative heat transfer in arc plasma models of a free-burning arc and a plasma torch in atmospheric pressure argon is taken into account in a self-consistent way. This is realized by the P1 method for solving the equation of radiative transfer and the multi-band approximation that considers the division of the emitted spectrum into a number of spectral bands. Net emission coefficients are evaluated by solving the equation of radiative transfer in three dimensions in an isothermal cylindrical plasma. The arc plasma parameters of the free-burning arc and the plasma torch obtained accounting for radiative transport have been compared with those from the temperature-dependent net emission coefficient for a radius of 1 mm. The results show that in general, the models applying the net emission coefficient provide results in the arc core close to that using the P1 method. The discrepancy is stronger in the arc periphery and near walls, where the P1 method predicts absorption of radiation.

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Section: Resultsmentioning

confidence: 63%

Section: Physical Backgroundmentioning

confidence: 99%

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Radiative Heat Transfer in Models of DC Arc Plasma

Baeva,

Kloc,

Cressault

2023

PPT

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“…in subbands with κ > 1 cm −1 . It was shown in [18] for pure air plasma that this approximation gives relatively good accuracy when compared to the exact spectral integration. Figs.…”

Section: P 1 Approximation and Mean Absorption Coefficientsmentioning

confidence: 99%

Influence of metal vapours on radiation characteristics of air arc plasmas

Bartlova¹,

Kloc²,

Aubrecht³

et al. 2020

PPT

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This paper deals with the evaluation of radiation properties of air arc plasma with various admixtures of Cu, Ag, and Fe, respectively. Under assumption of isothermal plasma cylinder, the net emission coefficients were calculated for various arc radii as a function of the plasma temperature up to 30000K. For plasma with prescribed temperature profile, the equation of radiation transfer was solved in the P1approximation, and the radiation flux and its divergence were calculated.

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“…As the radiative emission is wavelength dependent, to reduce the number of calculations, solutions are found for a number of averaged bands in the emission spectrum e.g. 11 in Peyrou et al 19 , Bartlova et al 20 and Tholin et al 18 , 5 in Eby et al 21 , and 4 in Aleksandrov et al 17 . Nordborg and Iordanidis 22 compare the accuracy of different methods of averaging the absorption coefficient in an SF 6 plasma and find that averaged models are sufficiently accurate so long as averages are calculated with a weighting based on their magnitude.…”

Section: Introductionmentioning

confidence: 99%

Equation of state driven radiative models for simulation of lightning strikes

Apsley,

Millmore,

Nikiforakis

2021

Preprint

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This work is concerned with the numerical simulation of plasma arc interaction with aerospace substrates under conditions akin to lightning strike and in particular with the accurate calculation of radiative heat losses. These are important because they have a direct effect on the calculation of thermal and pressure loads on the substrates, which can lead to material damage under certain conditions. Direct numerical solution of the radiation transport equation (RTE) in mesoscale simulations is not viable due to its computational cost, so for practical applications reduced models are usually employed. To this end, four approximations for solving the RTE are considered in this work, ranging from a simple local thermodynamical behaviour consideration, to a more complex spectral absorption dependent on the arc geometry. Their performance is initially tested on a one-dimensional cylindrical arc, before implementing them in a multi-dimensional magnetohydrodynamics code. Results indicate that inclusion of spectral absorption is necessary in order to obtain consistent results. However, the approaches accounting for the arc geometry require repeated solution of the computationally intensive Helmholtz equations, making them prohibitive for multi-dimensional simulations. As an alternative, a method using the net emission coefficient is employed, which provides a balance between computational efficiency and accuracy, as shown by comparisons against experimental measurements for a plasma arc attaching to an aluminium substrate.

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Modelling of Radiative Transfer in Air Arc Plasma

Cited by 4 publications

References 5 publications

Radiative Heat Transfer in Models of DC Arc Plasma

Radiative Heat Transfer in Models of DC Arc Plasma

Influence of metal vapours on radiation characteristics of air arc plasmas

Equation of state driven radiative models for simulation of lightning strikes

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