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k-MOMENT APPROXIMATION FOR THE NARROW BAND MODELING OF THE RADIATIVE PROPERTIES OF NONUNIFORM GASEOUS MEDIA

DOI: 10.1615/ICHMT.2007.RadTransfProc.200
page 10

Frederic Andre
Univ Lyon, CNRS, INSA-Lyon, Universite Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France

Rodolphe Vaillon
Centre de Thermique de Lyon (CETHIL, CNRS/INSA Lyon/UCBL), Domaine Scientifique de La Doua, 20 av. A. Einstein, 69621 Villeurbanne Cedex, France

Resumo

Moments of the absorption coefficient distribution function are used for the derivation of Statistical Narrow Band (SNB) model parameters of nonuniform optical paths in gases. The approach yields approximations for the path averaged first and second order k-moments from which equivalent SNB parameters are determined in the frame of the Malkmus model. The approach is assessed through comparisons with LBL data. The nonuniform approximation is shown to enable the computation of transmissivities and radiation intensities with accuracy similar or higher than those achieved by the Curtis-Godson one.

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