Radiative heat transfer in nonhomogeneous gases: A simplified approach

Grosshandler, William L.

doi:10.1016/0017-9310(80)90149-0

Cited by 134 publications

(52 citation statements)

References 13 publications

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“…For combustion gas radiation properties, a number of databases have been compiled based on line-by-line (LBL) [26,27], and narrow band [28,29] model, and global full-spectrum model [30,31]. The LBL is accurate at low temperatures, but requires excessive CPU time and is not suitable for high temperature combustion gases because the high temperature vibration-rotation absorption bands are not included.…”

Section: Fitted Snb-ck Radiation Model and Numerical Algorithmmentioning

confidence: 99%

Studies of radiation absorption on flame speed and flammability limit of CO2 diluted methane flames at elevated pressures

Chen

Qin

et al. 2007

Proceedings of the Combustion Institute

160

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The effects of spectral radiation absorption on the flame speed at normal and elevated pressures were experimentally and numerically investigated using the CO 2 diluted outwardly propagating CH 4 -O 2 -He flames. Experimentally, the laminar burning velocities of CH 4 -O 2 -He-CO 2 mixtures at both normal and elevated pressures (up to 5 atm) were measured by using a pressure-release type spherical bomb. The results showed that radiation absorption with CO 2 addition increases the flame speed and extends the flammability limit. In addition, it was also shown that the increase of pressure augments the effect of radiation absorption. Computationally, a fitted statistical narrow-band correlated-k (FSNB-CK) model was developed and validated for accurate radiation prediction in spherical geometry. This new radiation scheme was integrated to the compressible flow solver developed to simulate outwardly propagating spherical flames. The comparison between experiment and computation showed a very good agreement. The results showed that the flame geometry have a significant impact on radiation absorption and that the one-dimensional planar radiation model was not valid for the computation of the flame speed of a spherical flame. An effective Boltzmann number is extracted from numerical simulation. Furthermore, the FSNB-CK model was compared with the grey band SNB model. It was shown that the grey band SNB model over-predicts the radiation absorption. It is concluded that quantitative prediction of flame speed and flammability limit of CO 2 diluted flame requires accurate spectral dependent radiation model.

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Section: Fitted Snb-ck Radiation Model and Numerical Algorithmmentioning

confidence: 99%

Studies of radiation absorption on flame speed and flammability limit of CO2 diluted methane flames at elevated pressures

Chen

Qin

et al. 2007

Proceedings of the Combustion Institute

160

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“…Spectral emission from the fire is modelled using a statistical narrow band model, RADCAL, [39]. In the predictions of the external radiation heat flux presented in the following sections the spectrally integrated intensity is evaluated from integrations over the spectral window, 1μm-1000μm with approximately 300-400 narrow bands.…”

Section: Thermal Radiation Modellingmentioning

confidence: 99%

Modeling Lifted Methane Jet Fires Using the Boundary-Layer Equations

Cumber

Spearpoint

2006

Numerical Heat Transfer, Part B: Fundamentals

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The focus of this paper is turbulent lifted jet fires. The main objective is to present a lifted jet fire methodology using the boundary layer equations as a basis. The advantages of this are finite volume mesh independent predictions of the mean flow fields can be calculated on readily available computer resources which leads to rigorous model calibration. A number of lift-off models are evaluated. The model of choice is one based on the laminar flamelet quenching concept combined with a model for the large-scale strain rate.

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“…Ideally the spectral absorption coefficient should include the contribution from both the soot and participating species, however the calculation of the spectral line emission from gas molecules is a computationally challenging task compared to the continuous emission from the soot. No narrow or wide band approximations, [27,37] are available to model emission in the visible spectral window, as all such models have been formulated for banded emission in the infrared range, 1-1,000 μm. Therefore the spectral absorption coefficient is based on soot emission alone,…”

Section: Visible Radiation Modellingmentioning

confidence: 99%

A computational flame length methodology for propane jet fires

Cumber

Spearpoint

2006

Fire Safety Journal

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This paper presents a flame length methodology that mimics the human eye or camera using a CFD framework to calculate the flame structure. A parabolic flow model which accounts for turbulent combustion, soot kinetics and visible radiation distribution is extended to predict both rim-stabilised and lifted jet fires. The model is calibrated using a selected set of jet fire experiments and then validated against a wider range of data. Good agreement over a range of scales is demonstrated particularly when taking the degree of repeatability of the experiments into account. The flame length prediction is found to be insensitive to receiver location so long as the receiver is one or more flame lengths from the fire.

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Radiative heat transfer in nonhomogeneous gases: A simplified approach

Cited by 134 publications

References 13 publications

Studies of radiation absorption on flame speed and flammability limit of CO2 diluted methane flames at elevated pressures

Studies of radiation absorption on flame speed and flammability limit of CO2 diluted methane flames at elevated pressures

Modeling Lifted Methane Jet Fires Using the Boundary-Layer Equations

A computational flame length methodology for propane jet fires

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