Comparison of spectral models in the computation of radiative heat transfer in participating media composed of gases and soot

Mossi, Anderson C.; Galarça, Marcelo Moraes; Brittes, Rogério; Vielmo, Horácio A.; França, Francis

doi:10.1590/s1678-58782012000200002

Cited by 9 publications

(8 citation statements)

References 15 publications

(6 reference statements)

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“…However, one difficulty that arises is that without a comparison with benchmark solutions, generally achievable only with LBL integration, it is not possible to access the accuracy of a given model. Evaluation of gas models against LBL solutions has been published for one-dimensional slabs [4,6,8,[32][33][34], and for two-dimensional geometries [35][36][37][38][39][40][41][42]. However, since the temperature and concentration fields were not made available for most of those two-dimensional studies, their LBL results cannot be easily used to evaluate other gas models.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of gas radiation heat transfer in a 2D axisymmetric geometry using the line-by-line integration and WSGG models

Centeno

Brittes

Ezekoye

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Introductionmentioning

confidence: 99%

Evaluation of gas radiation heat transfer in a 2D axisymmetric geometry using the line-by-line integration and WSGG models

Centeno

Brittes

Ezekoye

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…recent studies also indicate good accuracy in the results for the radiant flux and the radiation source term, important parameters of the heat transfer process when compared to more current spectral models such as spectral-line-based WSGG (SLW) [43], absorption distribution function (ADF) [44], multi-scale FSCK (MSFSCK) [45], full spectrum correlated-k (FSCK) [46] and cumulative wavenumber (CW) [47]. Moreover, when the WSGG is compared with the benchmark solutions obtained with the line-by-line integration (LBL) of the spectrum [28,[48][49][50] the accuracy is very satisfactory. This paper uses the DTRM model with 16 rays.…”

Section: Radiative Transfer Equationmentioning

confidence: 99%

CFD analysis of the combustion process in a boiler of a 160 MWe power plant: leakage influence

Silva

Dondoni

Ermel

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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This paper presents a developed and validated CFD model of a boiler with the objective of studying a presumed defective actual operating condition, that is, air leakage into the furnace. Three cases were assessed, concerning the amount of air leakage across the boiler water seal. The base case considered the actual operational condition of 5% air leakage. Case 1 assumed 10%, and Case 2 simulated a more extreme leakage of 25%. The influence of the air leakage was analyzed with emphasis on temperature profiles, flow, wall heat flux, O 2 , CO, NOx, Soot and CO 2 formation. Eddy dissipation together with finite rate chemistry models were used to model the combustion process, while the k-ω approach was considered to predict the turbulence effect. Brazilian pulverized coal type CE3100 was adopted as fuel, burning in atmospheric air. The conservation equations of mass, momentum, energy and chemical species were solved by Finite Volume Method using Ansys CFX commercial software. As main results, it has been observed that air leakage across the water seal has influence over the profiles of temperature and concentration of oxygen and carbon dioxide. Significant amounts of air leakage can induce the plant staff to change the amount of air to be fed through the burners, changing the burning condition, thus impairing energy generation. Although the simulated case concerns a specific operational condition of a given thermal power plant, the results demonstrate the capability of CFD as a decision support tool. It has been found that even a small drop in the flue gas temperature in the combustion chamber due to air leakage in the water seal significantly affects the radiation heat transfer from flue gases to the chamber walls. The overall reduction in average wall heat flux was − 0,3% and − 1,81% of base case for cases 1 and 2, respectively. This situation alters the boiler behavior related to the formation of pollutants, especially NOx, also reduces the burning efficiency, increasing the concentration of CO and CH 4 in the exit region.

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“…This process demands a computational burden that is impossible to reach in the context of CFD simulation of practical engineering systems. Even for homogenous and isothermal medium, the numerical solution of the spectral RTE demands a significant computational effort [7].…”

Section: Thermal Radiation Modelingmentioning

confidence: 99%

“…These configurations exhibit the essential features of the radiation heat transfer occurring in practical devices. The canonical configuration of the hot combustion products between planes has been solved by a line-by-line method [7], which provides essentially an exact solution for comparison purposes. The second configuration studied is an enclosed flame jet that contains the basic ingredients of mass, momentum and heat transfer, as well as soot formation and oxidation.…”

Section: Thermal Radiation Modelingmentioning

confidence: 99%

Comparative study of thermal radiation properties models in turbulent non-premixed sooting combustion

Orbegoso

Silva

Serfaty

2015

Numerical Heat Transfer, Part A: Applications

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This work presents a numerical study of radiation heat transfer and its interaction with gray and spectral radiation of combustion products and soot that are formed in a turbulent non-premixed combustion process. To this purpose, WSGGM, Rayleigh, Narrow-Band Model and semi-empirical radiation properties models are considered. Two situations are studied, 1-D radiation problem and non-premixed gaseous combustion process. The results demonstrate that models exhibit discrepancies that are smaller than available line-by-line or experimental data. A study of the factors which influences such a disagreement is presented, underscoring the role of chemical kinetics of hydrocarbon species and of soot oxidation.

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Comparison of spectral models in the computation of radiative heat transfer in participating media composed of gases and soot

Cited by 9 publications

References 15 publications

Evaluation of gas radiation heat transfer in a 2D axisymmetric geometry using the line-by-line integration and WSGG models

Evaluation of gas radiation heat transfer in a 2D axisymmetric geometry using the line-by-line integration and WSGG models

CFD analysis of the combustion process in a boiler of a 160 MWe power plant: leakage influence

Comparative study of thermal radiation properties models in turbulent non-premixed sooting combustion

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