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Fonseca, Roberta Juliana Collet da; Fraga, Guilherme; Coelho, Felipe Ramos; França, Francis

doi:10.1016/j.ijheatmasstransfer.2022.123839

Cited by 10 publications

(12 citation statements)

References 54 publications

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“…Linear interpolations were used for in-between values of temperature and mole fraction. The results presented for = 1 atm were obtained with the use of the formulation presented by [11], which is the reference based on which the proposed method was developed.…”

Section: Methodsmentioning

confidence: 99%

“…In the present study, the proposed methodology-the wide-band based WSGG (WBW) model [11]is tested in the context of the pressures above the atmospheric pressure. The main goal of this spectral model is to improve the standard WSGG model by dividing the spectrum into several bands and determining the individual contributions of each band using the assumptions of the WSGG method.…”

Section: Methodsmentioning

confidence: 99%

“…In this framework, the main goal of this study is to present a methodology for the generation of the coefficients for the WSGG model at high pressures. The present method is based on the WBW model [11]-initially proposed for situations under atmospheric pressure-, in which the spectrum is divided into a set of bands and the standard WSGG model is used to solve the contribution of each spectral interval. The global result of the problem is given by the summation of the individual contributions of each band into which the spectrum was divided.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…With the advent of the spectroscopic databases mentioned in Section 3.1, significant research has gone into fine-tuning this model. These include a refinement of the gray-gas weights based on data in newer spectroscopic databases [113,114], the extension to a higher temperature and the pressure [115,116], extension to accommodate oxy-fuel combustion [117], and the extension to include soot [118][119][120]. It continues to have great popularity for combustion applications [121][122][123][124].…”

Section: Spectral (Nongray) Modelsmentioning

confidence: 99%

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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“…Although over the last decade, a huge number of studies have provided new WSGG parameters for CO 2 -H 2 O mixtures with the same mole ratio (MR) of H 2 O to CO 2 , this field has continued to have attention in recent years. Studies with MR set to 2.0 or 1.0 have been conducted in [19][20][21][22][23][24][25][26]. Values of MR set to 1.5 and 3.0 were considered in [27] and [28], respectively.…”

Section: Introductionmentioning

confidence: 99%

New gas radiation model based on the principle of weighted sum of gray gases. Application to CO ₂ –H ₂ O mixtures at high temperature

Asllanaj

França

Roche

et al. 2023

Numerical Heat Transfer, Part B: Fundamentals

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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A wide-band based weighted-sum-of-gray-gases model for participating media: Application to H2O-CO2 mixtures with or without soot

Cited by 10 publications

References 54 publications

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

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

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

New gas radiation model based on the principle of weighted sum of gray gases. Application to CO ₂ –H ₂ O mixtures at high temperature

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A wide-band based weighted-sum-of-gray-gases model for participating media: Application to H2O-CO2 mixtures with or without soot

Cited by 10 publications

References 54 publications

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

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

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

New gas radiation model based on the principle of weighted sum of gray gases. Application to CO 2 –H 2 O mixtures at high temperature

Contact Info

Product

Resources

About

New gas radiation model based on the principle of weighted sum of gray gases. Application to CO ₂ –H ₂ O mixtures at high temperature