Dembele, S., Lima, K. L. M. and Wen, Jennifer X. (2011) Assessment of an unstructured exponential scheme discrete ordinates radiation model for non-gray media. Heat and Mass Transfer, Volume 47 (Number 11). pp. 1349-1362. doi:10.1007/s00231-011-0805-9

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Abstract

For radiative transfer in complex geometries, Sakami and his co-workers have developed a discrete ordinates method (DOM) exponential scheme for unstructured meshes which was mainly applied to gray media. The present study investigates the application of the unstructured exponential scheme to a wider range of non-gray scenarios found in fire and combustion applications, with the goal to implement it in an in-house Computational Fluid Dynamics (CFD) code for fire simulations. The original unstructured gray exponential scheme is adapted to non-gray applications by employing a statistical narrow-band/correlated-k (SNB-CK) gas model and meshes generated using the authors’ own mesh generator. Different non-gray scenarios involving spectral gas absorption by H2O and CO2 are investigated and a comparative analysis is carried out between heat flux and radiative source terms predicted and literature data based on ray-tracing and Monte Carlo methods. The maximum discrepancies for total radiative heat flux do not typically exceed 5%.

Item Type:	Journal Article
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Heat and Mass Transfer
Publisher:	Springer
ISSN:	0947-7411
Official Date:	2011
Dates:	Date Event 2011 Published
Volume:	Volume 47
Number:	Number 11
Page Range:	pp. 1349-1362
DOI:	10.1007/s00231-011-0805-9
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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