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Weighted-sum-of-gray-gases models for non-gray thermal radiation of hydrocarbon fuel vapors, CH4, CO and soot
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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15
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Fire Safety Journal, Volume 125
Abstract
Using the high-resolution experimental spectral absorption coefficients of six fuel gases and the line by line absorption spectra of CO and CH4 based on HITRAN and HITEMP spectral databases, in this paper, novel coefficients for weighted-sum-of-gray-gases (WSGG) model are presented for Heptane, Methane, Methanol, MMA, Propane, Propylene, Toluene, and CO. Moreover, for soot, the spectral absorption coefficients were calculated assuming Rayleigh regime implementing the complex index of refraction obtained from the correlations of Chang and Charalampopoulos. The presented WSGG models were coupled with those of literature for CO2 and H2O by means of the superposition method. The models were first validated in several one-dimensional benchmarks representing various levels of inhomogeneous conditions in temperature, gas concentration and soot loading. Then, the WSGG models were employed in solving a three-dimensional case representing a Heptane pool fire. Using the time averaged 3-D CFD profiles, the WSGG models solved the spectral radiative heat transfer exhibiting excellent agreement with the results of line by line calculations in terms of radiative heat flux and radiative heat source. Moreover, the emissivity charts were provided comparing the emissivity calculated by LBL calculations with those of the new WSGG models.
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Funding Information: The authors greatly acknowledge the support of the Academy of Finland under grant No. 314487 and the Finnish Fire Protection Fund (Palosuojelurahasto). They also thank Dr. Kaoru Wakatsuki of Shinshu University for providing the experimental spectral absorption data of the fuel gases. Funding Information: The authors greatly acknowledge the support of the Academy of Finland under grant No. 314487 and the Finnish Fire Protection Fund (Palosuojelurahasto). They also thank Dr. Kaoru Wakatsuki of Shinshu University for providing the experimental spectral absorption data of the fuel gases. Publisher Copyright: © 2021 The Authors
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Sadeghi, H, Hostikka, S, Fraga, G C & Bordbar, H 2021, 'Weighted-sum-of-gray-gases models for non-gray thermal radiation of hydrocarbon fuel vapors, CH4, CO and soot', Fire Safety Journal, vol. 125, 103420. https://doi.org/10.1016/j.firesaf.2021.103420