Accuracy of Engineering Methods for Radiative Transfer in Co2-H2o Mixtures at High Temperature

André, Frédéric; Coelho, Felipe Ramos; Consalvi, Jean-Louis; França, Francis; Galtier, Mathieu; Nmira, Fatiha; Solovjov, Vladimir P.; Webb, Brent W.

doi:10.1615/rad-19.500

Cited by 9 publications

(6 citation statements)

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“…It is clear that the FSCK and SLW models have comparable accuracy, while the WSGG model is somewhat less accurate than these two frontrunners. A newly developed transmissivity-based spectral model-an -distribution model [155]-also showed a good level of accuracy in a recent study [156]. Although somewhat obsolete and not as accurate, step-wise gray (or box) models based on either narrow-band or wide-band data continue to be used [105] for modeling combustion in practical systems because of their ease of use and implementation-notably, most commercial CFD codes provide an in-built step-wise gray model framework.…”

Section: Spectral-line-based Weighted-sum-of-gray-gases (Slw)mentioning

confidence: 89%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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Modeling thermal radiation in combustion environments can be extremely challenging for two main reasons. First, the radiative transfer equation (RTE), which is the cornerstone of modeling radiation in such environments, is a five-dimensional integro-differential equation. Second, the absorption and scattering coefficients of molecular gases and particulates prevalent in combustion environments oscillate strongly with the wavenumber (or wavelength), i.e., the medium is strongly nongray, requiring the solution of the RTE for a large number of wavenumbers. This article reviews the progress that has been made in this area to date with an emphasis on the work performed over the past three decades. Progress in both deterministic and stochastic (Monte Carlo) solutions of the RTE is reviewed, in addition to the review of the treatment of the spectral properties of gases, soot, and fuel droplets that dominate combustion environments, i.e., spectral or nongray models. The application of the various state-of-the-art nongray models and RTE solution methods to flames (particularly turbulent), fires, combustors, and other combustion systems are summarized along with a critical discussion of the pros and cons of the models and methods. Finally, the challenges that remain in modeling thermal radiation in combustion systems are highlighted and future outlooks are shared.

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Section: Spectral-line-based Weighted-sum-of-gray-gases (Slw)mentioning

confidence: 89%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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“…The LBL method on the other hand computes an emissivity for every line of the spectrum resulting in the need of solving the RTE for each of the lines for every direction [10]. For modelling of complex industrial applications, the WSSG model often is chosen and delivers accurate estimates [11]. Most WSGG formulations offer different sets of parameters depending on the gas composition in the cell.…”

Section: Radiative Transfer and The Wsgg Modelmentioning

confidence: 99%

Numerical investigation of radiative transfer during oxyfuel combustion of hydrogen and hydrogen enriched natural gas in the container glass industry

Ott,

Losacker,

Schmitz

et al. 2024

J. Phys.: Conf. Ser.

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The substitution of natural gas with hydrogen is one way to eliminate direct CO2 emissions. However, oxyfuel combustion of hydrogen or hydrogen enriched natural gas leads to different exhaust gas properties due to a changed composition compared to conventional combustion. In combustion simulation, the emissivity of a gas mixture is usually approximated using a Weighted Sum of Gray Gases (WSGG) model. Most of the existing WSGG models have been validated for natural gas combustion with air or oxyfuel and are therefore not applicable to hydrogen-oxyfuel combustion. CFD simulations showed, that none of the investigated WSGG models is able to predict the radiative heat transfer for all considered combustion scenarios with appropriate accuracy. In addition, in container glass manufacturing more than 95% of the heat flux to the glass surface is transferred by radiation because of the high process temperatures. Due to the changed gray gas emissivity, the high content of water vapor leads to a different emission spectrum of the exhaust gas. The influence of the changed emission spectrum on radiative heat transfer and the penetration depth of radiation in the glass melt is investigated using a simulation model of a pilot plant and non-gray modelling of the radiation transport. The CFD simulations show slightly enhanced radiative heat transfer to the glass and a slightly deeper penetration depth especially for wavelength below 2.2 μm for hydrogen-oxyfuel combustion.

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“…Recent comparisons [98] between these two approaches have also shown that the FSCK scheme of Cai and Modest cannot be recommended in situations where absorption by gases is dominant, whereas both methods provide acceptable and similar accuracies in emission-dominant cases as encountered in most combustion applications. Consequently, in general, the RC-FSK method (or its SLW predecessor, the RC-SLW method) is now recommended for radiative heat transfer calculations [99].…”

Section: Figurementioning

confidence: 99%

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Liu

Consalvi

Coelho

et al. 2020

Fuel

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Radiative heat transfer (RHT) is often the dominant mode of heat transfer in flames, fires, and combustion systems and affects significantly temperature distributions directly and kinetically controlled chemical processes indirectly. Modeling RHT accurately in multidimensional flames and combustion systems is challenging mainly due to the highly spectral dependence of radiative properties of combustion products, the high computational cost of solving the radiative transfer equation (RTE), and the strong turbulence and radiation interactions (TRI). Significant progress has been made in all the three aspects in the last three decades and the state-of-the-art models and methods have been incorporated into CFD practice for modeling fires, turbulent jet flames, and turbulent combustion in combustion systems. In this article, we first discuss the coupling between RHT and combustion and the important role played by RHT in some fundamental flame phenomena. Then we discuss the state-of-the-art radiation models with a focus on RTE solvers, radiative property models and TRI. Next, we review the recent simulations of turbulent combustion systems involving these state-of-the-art radiation models. Finally, we provide concluding remarks and some potential research areas to advance RHT modeling in multiphase reacting flows. Nomenclature, , area normal to directions x, y and z [m 2 ] non-grey stretching factor for WSGG, SLW, and FSK methods absorption cross-section of a soot primary particle [m 2 ] absorption cross-section of a soot aggregate [m 2 ] diameter [m] , , integral over a control angle of the direction cosines relative to x, y and z-axis particle size parameter [-] radiant fraction [-] array of variables defining the absorption coefficient, = { , , , } Ω solid angle [sr] Subscript Fuel direction j spectral line S soot at a given wavenumber Superscript aggregate lth direction (DOM) or lth control angle (FVM) mth direction (DOM) or mth control angle (FVM) primary particle Operators 〈 〉 Reynolds averaged quantity ′ Reynolds fluctuating quantity ̅ filtered (or resolved) quantity ′′ subgrid-scale (or residual) fluctuation Recently, quasi-MC methods [43], [44] were employed to solve RHT problems in 3D participating media, aimed at the improvement of the convergence rate, and therefore the computational efficiency. In these methods, the random numbers are replaced by low-

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Accuracy of Engineering Methods for Radiative Transfer in Co2-H2o Mixtures at High Temperature

Cited by 9 publications

References 0 publications

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Numerical investigation of radiative transfer during oxyfuel combustion of hydrogen and hydrogen enriched natural gas in the container glass industry

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

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