ARTICLE:

• AN IMPROVED SPECTRAL WSGGM OF WATER VAPOR USING A NARROW BAND MODEL  download article

Ook Joong Kim
Department of Thermal and Fluid Systems Korea Institute of Machinery and Materials, Taejon, Korea

Tae-Ho Song
Department of Mechanical Engineering Korea Advanced Institute of Science and Technology, Taejon, Korea

ABSTRACT

A WSGGM-based low resolution spectral modeling of radiative properties of water vapor using a narrow band model has been presented. For a given narrow band, models of gray gas absorption coefficients vs. temperature relation have been reviewed and an improved model is suggested. The modeled gray gas absorption coefficients become the basic radiative property which can be used for any solution methods for Radiative Transfer Equation (RTE). Comparisons between the modeled emissivity and the 'true' emissivity generated from a high temperature statistical narrow band parameters are made for a few typical bands. Application of the model to nonuniform gas layer is also made. Low resolution spectral intensities at the boundary are obtained for uniform, parabolic and boundary layer type temperature profiles using the obtained WSGGM's with 15 gray gases. The results are compared with the narrow band spectral intensities as obtained by a narrow band model-based code with the Curtis-Godson approximation. Good agreement is found between them. Local heat source strength and total wall heat flux are also compared for the reference cases, which again produced acceptable agreement.

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