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Progress in Plasma Processing of Materials, 2001

ISBN Imprimir: 1-56700-165-3

RADIATIVE TRANSFER IN OXYGEN, NITROGEN AND AIR THERMAL PLASMAS BETWEEN 300 AND 30 000 K

Sinopsis

We have calculated the mean absorption coefficients of pure nitrogen and oxygen in the assumption of a grey body on six frequency intervals. This calculation takes into account the radiation due to the atomic continuum, the molecular continuum, the molecular bands (several systems for O2, N2, NO and N2*) and the atomic lines. A special treatment of the resonance lines has been performed in order to take into account the self-absorption of these lines. Then, a 1D calculation of the radiative transfer has been performed and has shown that nitrogen is more emissive than oxygen in the temperature range between 8 000 and 15 000 K, whereas the absorption by molecular oxygen is higher than that of nitrogen when T < 4000 K. This last phenomena is mainly due to the photodissociation mechanism.
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