Comparison of Mean Absorption Methods for Radiation Transfer Models in Air Plasma at Various Pressures

Comparison of Mean Absorption Methods for Radiation Transfer Models in Air Plasma at Various Pressures

Článek WoS

Mean Absorption Coefficients (MACs) represent a potentially suitable way of calculation of radiation transfer in relatively complex geometries. They allow utilization of well established radiation transfer models such as DOM or P1 approximation while removing the complexity of the real spectrum, thus greatly reducing the computation power and time requirements of these models. However, no generally accepted method of MAC prediction was proposed so far, which would be applicable in the wide variety of conditions. This paper presents but a small, yet important step in a search for the ultimate MAC method. It provides an accuracy evaluation of three different MAC methods, namely line-limited Planck MAC, Rosseland MAC and hybrid MAC, while applied to the case of air plasma at various pressures. The line limited Planck MAC proved to be the most accurate method at low pressure, but its reliance on predefined spatial parameter called Characteristic absorption length makes it hard to apply in real situations. The other two methods proved unsatisfactory results for low pressure thermal plasma. However, the hybrid MAC was found to be superior at elevated pressure providing possibly the most universal option for radiation evaluation.

Mean Absorption Coefficients (MACs) represent a potentially suitable way of calculation of radiation transfer in relatively complex geometries. They allow utilization of well established radiation transfer models such as DOM or P1 approximation while removing the complexity of the real spectrum, thus greatly reducing the computation power and time requirements of these models. However, no generally accepted method of MAC prediction was proposed so far, which would be applicable in the wide variety of conditions. This paper presents but a small, yet important step in a search for the ultimate MAC method. It provides an accuracy evaluation of three different MAC methods, namely line-limited Planck MAC, Rosseland MAC and hybrid MAC, while applied to the case of air plasma at various pressures. The line limited Planck MAC proved to be the most accurate method at low pressure, but its reliance on predefined spatial parameter called Characteristic absorption length makes it hard to apply in real situations. The other two methods proved unsatisfactory results for low pressure thermal plasma. However, the hybrid MAC was found to be superior at elevated pressure providing possibly the most universal option for radiation evaluation.

Plasma radiation; Arc; Mean absorption coefficients; Numerical optimization; Air plasma; Wall-stabilized arc

Plasma radiation; Arc; Mean absorption coefficients; Numerical optimization; Air plasma; Wall-stabilized arc

KLOC, P.; AUBRECHT, V.; BARTLOVÁ, M.; FUCHS, R.

2023

16.12.2022

SPRINGER

0272-4324

Plasma chemistry and plasma processing

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1

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https://link.springer.com/article/10.1007/s11090-022-10304-9