Radiative heat transfer through the fuel-rich core of laboratory-scale pool fires

  1. Get@NRC: Radiative heat transfer through the fuel-rich core of laboratory-scale pool fires (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1080/00102202.2014.883221
AuthorSearch for: ; Search for:
Journal titleCombustion Science and Technology
Pages475489; # of pages: 15
SubjectAbsorption spectroscopy; Carbon dioxide; Carbon monoxide; Forecasting; Fuels; Loading; Methane; Plasma diagnostics; Radiative transfer; Soot; Absorption co-efficient; Fire dynamic simulators; Fuel-rich core; Gaseous species concentrations; Heat Release Rate (HRR); Radiative heat transfer; Soot volume fraction; Spectroscopic database; Fire protection
AbstractRadiative heat transfer calculations are conducted along the axis of six axisymmetric pool fires by using the "exact" line-by-line (LBL) method, the narrow band correlated k (NBCK) model, the full-spectrum correlated k (FSCK) model, the multi-scale full-spectrum k-distribution (MSFSK) model, and the wide-band model implemented in the fire dynamic simulator (FDS). The two baseline cases correspond to 34 kW and 176 kW methane pool fires generated on a burner of 0.38 m diameter. For each heat release rate, two other moderately and heavily sooting pool fires were generated by considering higher soot volume fractions while keeping temperature and gaseous species concentrations unaltered. For each radiative model, the corresponding absorption coefficients for carbon dioxide, water vapor, carbon monoxide, and methane were generated from the same high-resolution spectroscopic databases. Model results show that the contribution of carbon monoxide to the radiative intensity can be neglected, whereas that of methane increases with the heat release rate (HRR) and decreases as the soot loading increases. It is also found that the gray approximation for soot holds for the 34 kW pool fires and the weakly and moderately sooting 176 kW pool fires but ceases to be valid for the heavily sooting 176 kW pool fire. Concerning the accuracy of the different approximate radiative models, comparisons with the LBL solutions show that the NBCK model can be used as a reference if LBL solutions are not available. On the other hand, the FDS wide-band model fails in predicting accurately the radiative intensity through the fuel-rich core of pool fires. Finally, the FSCK provide predictions within 10% of LBL solutions with the exception of the heavily sooting 176 kW pool fire where the strong attenuation of radiation by methane invalidates the "correlated" assumption of the absorption coefficient. In this case, the MSFSK model must be considered, improving substantially the predictions of the FSCK. Copyright © Taylor & Francis Group, LLC.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards (MSS-SME)
Peer reviewedYes
NPARC number21272253
Export citationExport as RIS
Report a correctionReport a correction
Record identifier538ec6c1-a91f-4f6b-97cf-0ebf84f497de
Record created2014-07-23
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)