Importance of Combined Lorentz-Doppler Broadening in High-Temperature Radiative Heat Transfer Applications

Wang, Anquan; Modest, Michael F.

doi:10.1115/1.1798951

Cited by 31 publications

(4 citation statements)

References 19 publications

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“…The Lorentz profile was used for the shape of spectral lines based on the line characteristics obtained from the spectral database of HITEMP2010. For the pressures equal or higher than 1 bar and temperatures less than 2500K, the Doppler broadening is negligible and therefore Lorentz profile sufficiently describe the shape of the absorption lines [34]. A minimum limit of 10 -9 cm -1 has been used for the line wings to be included (i.e.…”

Section: Line By Line Absorption Spectra Of Combustion Gasesmentioning

confidence: 99%

Numerically resolved line by line radiation spectrum of large kerosene pool fires

Bordbar

Hostikka

Boulet

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Line By Line Absorption Spectra Of Combustion Gasesmentioning

confidence: 99%

Numerically resolved line by line radiation spectrum of large kerosene pool fires

Bordbar

Hostikka

Boulet

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Although the Voigt profile might be the best option to describe the spectral line broadening at high pressures and elevated temperatures, the studies of Ref. [15] showed that it is still accurate to apply the Lorentz profile for the physical conditions studied in this paper. Linear interpolations were used for in-between values of temperature and mole fraction.…”

Section: Methodsmentioning

confidence: 90%

An Extension of the Wide-Band Based Weighted-Sum of-Gray-Gases Model to High Pressure Conditions

Fonseca

Fraga

Asllanaj

et al. 2023

Proceeding of Proceedings of the 10th International Symposium on Radiative Transfer, RAD-23 Thessaloniki, Greece, 12–16 June 20

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In this paper, an alternative method for the generation of correlations for the weightedsum-of-gray gases (WSGG) model at high pressure conditions is tested. The proposed methodology, which is an extension of the wide-band based WSGG (WBW) model, consists of dividing the radiation spectrum into a set of bands and applying the standard WSGG model to each one of these regions, in order to solve the gray gas coefficients. The WBW model firstly determines the emittance of each band in which the spectrum was segmented using line-by-line (LBL) calculations, and then the pressure-absorption and temperature-dependent coefficients are obtained through polynomial temperature fittings. The overall radiative transfer equation (RTE), the radiative heat flux and the radiative heat source are obtained by summing up the individual contributions from each spectral band. The results show that the WBW model provides accurate solutions of the radiative problem even for high pressures, with maximum deviations regarding the LBL integration less than 4 %, which is compatible with other WSGG approaches in the literature.

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“…The dependences of κ η,i , N and C η,i on η, p, T , and Y i were left explicit in the above equation, from which it can be seen that the wavenumber dependence of the absorption spectrum is inherited solely from the absorption cross-section. The spectral absorption coefficient was obtained based on Lorentz's line broadening [34] using the high-resolution spectroscopic database HITEMP2010 [35]. More details of the methodology can be found in [13,21,23] 5 For the line-by-line integration method (applied both for constructing the emmitance charts in Section 3 and as a reference for the radiative transfer calculations reported in Section 5) the κ η,i spectra for H 2 O and CO 2 is obtained for 150000 wavenumber values between η = 100 and η = 10000 cm −1 .…”

Section: Generating Absorption Spectral Datamentioning

confidence: 99%

A Compact WSGG Formulation to Account for Inhomogeneity of H2O–CO2 Mixtures in Combustion Systems

Selhorst

Fraga

Coelho

et al. 2022

Journal of Heat Transfer

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An alternative weighted-sum-of-gray-gas (WSGG) model is proposed to deal with conditions that are common in oxy-?red combustion. The method proposes a single set of pressure-based absorption coefficients that account for different mole fraction ratios (MR) of H2O-CO2, thus requiring no further interpolation, which in turn brings not only less uncertainty into the model, but also simplifies its use. The HITEMP-2010 spectral database along with the line-by-line (LBL) integration is employed to generate a set of accurate total emissivities from which the WSGG coefficients are fitted. The fitting procedure employs a novel formulation to account for the MR dependence, leading to a more compact set of WSGG correlations when compared to the alternatives available in the literature. As oxy-?red combustion usually occurs in two distinct scenarios, dry- and wet- ?ue-gas-recirculation (FGR), the paper also proposes two other sets of coefficients intended to support the MR ranges corresponding to these specific conditions. Comparisons made against the benchmark LBL integration and other WSGG models, for one- and three-dimensional calculations, show the satisfactory level of accuracy of the proposed sets of correlations. In particular, the three-dimensional test case illustrates that the new model is also applicable to conditions observed in air-fuel combustion.

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Importance of Combined Lorentz-Doppler Broadening in High-Temperature Radiative Heat Transfer Applications

Cited by 31 publications

References 19 publications

Numerically resolved line by line radiation spectrum of large kerosene pool fires

Numerically resolved line by line radiation spectrum of large kerosene pool fires

An Extension of the Wide-Band Based Weighted-Sum of-Gray-Gases Model to High Pressure Conditions

A Compact WSGG Formulation to Account for Inhomogeneity of H2O–CO2 Mixtures in Combustion Systems

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