DOI: 10.1615/ICHMT.1995.RadTransfProc
ISBN Print: 978-1-56700-068-9
ISSN Online: 2642-5629
ISSN Flash Drive: 2642-5661
ACCURACY OF VARIOUS GAS IR RADIATIVE PROPERTY MODELS APPLIED TO RADIATIVE TRANSFER IN PLANAR MEDIA
SINOPSIS
The accuracy of different gas radiative property models is studied by comparing their results to a reference line-by-line approach for a planar geometry. The corresponding computational times are compared. The parameters of the four approximate models, i.e. correlated-k (CK), correlated-k fictitious gas (CKFG), statistical narrow-band (SNB) and weighted sum of gray gases (WSGG), have been obtained from the line-by-line approach using the same spectroscopic data base in order to study the intrinsic qualities of each model. The studied medium is a H2O-N2 mixture contained between two isothermal parallel walls. Results are discussed from different points of view: advantages of models expressed in terms of absorption coefficients, ability of models to treat wall reflection, optically thin and thick media, long-range sensing applications, etc. The WSGG model is less time consuming than other models, but is generally characterized by a poor accuracy. The other approximate models are characterized by accuracies depending on the considered conditions. The choice of a model for a given application is discussed.