Calculation of radiation transmittance through n-heptane in a pool fire

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Calculation of radiation transmittance through n-heptane in a pool fire. / Isojärvi, Teemu; Bordbar, Hadi; Hostikka, Simo.

In: Journal of Physics: Conference Series, Vol. 1107, No. 4, 042002, 14.11.2018.

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@article{aa69dccbaa194688802d50210a8f81b9,
title = "Calculation of radiation transmittance through n-heptane in a pool fire",
abstract = "The radiative transfer mechanisms in a volatile hydrocarbon pool fire were investigated by solving the transmittance of infrared radiation through fuel (n-heptane) layers of different depths. The incoming radiation was assumed to have the same relative amounts of different wavelengths as a spectrum obtained experimentally for a 2 meter pool fire, and the transmittances were calculated by integrating either the single-ray Lambert-Beer formula, the two-flux (Schuster-Schwarzschild) method solution or the analytical plane-parallel monochromatic/gray solution of the radiative transfer equation over wavelength, using the liquid absorption coefficients from several sources. The obtained transmittances were compared to earlier heat flux measurements, and the possibility of calculating them with significantly less computation time by using a k-distribution method was investigated. The results managed to replicate the measured heat flux values at depths over 1 mm in the liquid with reasonable accuracy, and the use of the k-distribution, more known and used in gas phase thermal radiation calculations, significantly speeds up the calculations.",
keywords = "hydrocarbon, infrared spectra, pool fire, thermal radiation, transmittance",
author = "Teemu Isoj{\"a}rvi and Hadi Bordbar and Simo Hostikka",
year = "2018",
month = "11",
day = "14",
doi = "10.1088/1742-6596/1107/4/042002",
language = "English",
volume = "1107",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "4",

}

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TY - JOUR

T1 - Calculation of radiation transmittance through n-heptane in a pool fire

AU - Isojärvi, Teemu

AU - Bordbar, Hadi

AU - Hostikka, Simo

PY - 2018/11/14

Y1 - 2018/11/14

N2 - The radiative transfer mechanisms in a volatile hydrocarbon pool fire were investigated by solving the transmittance of infrared radiation through fuel (n-heptane) layers of different depths. The incoming radiation was assumed to have the same relative amounts of different wavelengths as a spectrum obtained experimentally for a 2 meter pool fire, and the transmittances were calculated by integrating either the single-ray Lambert-Beer formula, the two-flux (Schuster-Schwarzschild) method solution or the analytical plane-parallel monochromatic/gray solution of the radiative transfer equation over wavelength, using the liquid absorption coefficients from several sources. The obtained transmittances were compared to earlier heat flux measurements, and the possibility of calculating them with significantly less computation time by using a k-distribution method was investigated. The results managed to replicate the measured heat flux values at depths over 1 mm in the liquid with reasonable accuracy, and the use of the k-distribution, more known and used in gas phase thermal radiation calculations, significantly speeds up the calculations.

AB - The radiative transfer mechanisms in a volatile hydrocarbon pool fire were investigated by solving the transmittance of infrared radiation through fuel (n-heptane) layers of different depths. The incoming radiation was assumed to have the same relative amounts of different wavelengths as a spectrum obtained experimentally for a 2 meter pool fire, and the transmittances were calculated by integrating either the single-ray Lambert-Beer formula, the two-flux (Schuster-Schwarzschild) method solution or the analytical plane-parallel monochromatic/gray solution of the radiative transfer equation over wavelength, using the liquid absorption coefficients from several sources. The obtained transmittances were compared to earlier heat flux measurements, and the possibility of calculating them with significantly less computation time by using a k-distribution method was investigated. The results managed to replicate the measured heat flux values at depths over 1 mm in the liquid with reasonable accuracy, and the use of the k-distribution, more known and used in gas phase thermal radiation calculations, significantly speeds up the calculations.

KW - hydrocarbon

KW - infrared spectra

KW - pool fire

KW - thermal radiation

KW - transmittance

UR - http://www.scopus.com/inward/record.url?scp=85057528475&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/1107/4/042002

DO - 10.1088/1742-6596/1107/4/042002

M3 - Article

VL - 1107

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 4

M1 - 042002

ER -

ID: 30325616