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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

RECENT DEVELOPMENTS IN MODELING THE INFRARED RADIATIVE PROPERTIES OF HOT GASES

Get access (open in a dialog) DOI: 10.1615/IHTC11.2700
pages 175-187

Abstract

Recent works related to gas inlrared radiative properties are reported. The advantages and drawbacks of ap proximate models suitable at high temperature are discussed. Only models with parameters generated from spectroscopic data bases arc considered in order to enable to study their intrinsic accuracy by comparison with a line-by-line approach using the same bases. These approximate models include band models for radiative transfer (box model, statistical narrow-band model, correlated-k (CK) model), band models for long-range sensing (CK with fictitious gases, ... ) and global models (weighted sum of gray gases (WSGG) model, and models based on a global weighted distribution function of the absorption coefficient such as the spectral line based WSGG model, called SLW, the ADF model and its variant with fictitious gases, ADFFG). All these models are summarized and problems arising from their implementation are discussed, in particular their ability to deal with frequency dependent radiative properties of walls or particles, with nonisothermal or nonhomogeneous media, and with mixtures of absorbing gases. The compatibility of these models with various methods of solution of the radiative transfer equation is also discussed, in particular for applications involving wall reflection, or scattering by partides.