Comparative study of WSGG and SLW models coupled with control volume finite element method for non gray radiation prediction

Ali, H. Belhaj; Askri, Faouzi; Nasrallah, Sassi Ben

doi:10.1016/j.ijthermalsci.2016.11.009

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…That is, the effect of temperature on the emissivity of the gas mixture for a large molar ratio is smaller than that for a small molar ratio. Moreover, this is similar to that under atmospheric pressure in the literature . It can be concluded that the increase in the flue gas temperature will reduce the emissivity of the gas mixture under pressurized oxy‐fuel conditions.…”

Section: Resultssupporting

confidence: 87%

“…Moreover, this is similar to that under atmospheric pressure in the literature. 16 It can be concluded that the increase in the flue gas temperature will reduce the emissivity of the gas mixture under pressurized oxy-fuel conditions. The smaller the molar ratio is, the more obvious this phenomenon will be.…”

Section: Emissivity Results Under Pressurized Conditionsmentioning

confidence: 99%

“…where the blackbody emission intensity can be expressed as I b (x) = σT(x) 4 /π; the items in Equation 16 were determined based on the state at position x. b s represents the 1-dimensional major directions of the calculation, which are divided into positive and negative directions. Therefore, 2 groups of directions exist when the DOM is used.…”

Section: Radiation Transfer Equationmentioning

confidence: 99%

“…For the radiation heat transfer calculation of oxy‐fuel combustion, the weighted‐sum‐of‐gray‐gases (WSGG) model can quickly and accurately calculate the radiation characteristics of oxy‐fuel gases; and it has been widely used in oxy‐fuel furnace computational fluid dynamics (CFD) simulation research . In recent years, scholars have developed different WSGG models for oxy‐fuel conditions based on different benchmark models.…”

Section: Introductionmentioning

confidence: 99%

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New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

et al. 2017

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Summary Pressurized oxy‐fuel combustion technology has received considerable attention due to its ability to improve the overall system efficiency and to control CO2 emissions. The characteristics of radiation heat transfer are significant for pressurized oxy‐fuel gas mixture and different from those under atmospheric conditions. Therefore, to calculate the radiation characteristics of pressurized oxy‐fuel gas mixture quickly and accurately, new weighted‐sum‐of‐gray‐gases (WSGG) model for pressurized oxy‐fuel conditions was first presented in this paper, which was applied in 3 typical high pressure conditions: 5, 10, and 15 bar. The new WSGG model correlations were suitable for pressurized conditions with a molar ratio range of 0.125‐2, temperature range of 400‐2500 K, and path length range of 0.1‐20 m. Calculations for a variety of typical pressurized oxy‐fuel combustion cases showed that the new WSGG model can accurately predict the radiation characteristics and heat transfer characteristics of the gas mixtures compared with the SNB model benchmark. In addition, the application of the previous atmospheric WSGG models yielded non‐ideal results under pressurized conditions. Consequently, the new model can provide efficient and accurate radiation heat transfer results for pressurized oxy‐fuel conditions and can be used to design pressurized oxy‐fuel combustion furnaces or boilers.

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Section: Resultssupporting

confidence: 87%

Section: Emissivity Results Under Pressurized Conditionsmentioning

confidence: 99%

Section: Radiation Transfer Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

et al. 2017

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“…All conditions taken into account of the real process of fuel combustion. For conducting numerical modeling were used control volume method [26][27], where in International Journal of Mathematics and Physics 9, №1, 60 (2018) computational experiment the chamber has been divided into 126 496 cells.…”

Section: Methodsmentioning

confidence: 99%

Heat and mass transfer processes at high-temperature media during combustion of low-grade pulverized coal

Аскарова

Bolegenova

Šafařík

et al. 2018

Int. j. math. phys.

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The article is devoted to the complex research processes of heat and mass transfer occurring in the real conditions of solid fuel (coal) combustion. Development of technological processes with economic and ecological advantages are the main purpose for many researches in thermal physics and technical physics. The complex processes of heat and mass transfer in the presence of combustion are non-stationary, strongly non-isothermal with a constant change in the physical and chemical state of the environment. It greatly complicates their experimental study. In this case, studying of heat and mass transfer in high-reacting media with simulation of physical and chemical processes occur during combustion of pulverized coal is important for the solution of modern power engineering industry and ecology problems. In this regard, a comprehensive study of heat and mass transfer processes at hightemperature media observed. Investigations based on the achievements of modern physics by using numerical methods for 3D modeling. Numerical experiments are conducted to describe and study aerodynamic characteristics, heat and mass transfer processes during the burning of pulverized Kazakhstan low-grade coal. The results obtained are of great practical importance, since they allow us to develop recommendations for the improvement and design of new combustion chambers and burners, and also can be useful in optimizing the whole process of burning fossil fuels.

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Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

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Summary It is well‐known that the pollutant formation processes and temperature distribution in various combustion systems that operate at high temperatures are influenced by radiation heat transport. Detailed modeling of radiation transport in internal combustion (IC) engines demands additional computational power, and hence the calculation of radiation phenomenon is not commonly applied in IC engines. At the same time, current operating conditions in IC engines consider high temperatures and recirculation of exhaust gases that enhance gas radiation. Therefore, the application of radiation models is needed to increase the correctness of radiative absorption, combustion characteristics, and the formation of pollutant emissions. In this paper, the implementation and validation of the spectral line‐based weighted‐sum‐of‐gray‐gases (SLW) model for calculating soot and gas radiation are performed. The SLW model is implemented in the computational fluid dynamics code AVL FIRE by programable user routines. The radiative transfer equation was calculated employing the finite volume method applicable for multiprocessing, moving meshes, and a mesh rezone procedure required for IC engine modeling. The validation of the SLW model is performed on one‐dimensional geometric cases that include analytical results of radiation intensity, for which agreement within 10% of the relative error was achieved. Additionally, the SLW model is applied to compression ignition engine simulations, where the obtained results are compared with the measured pressure and concentrations of NO and soot emissions. The calculated heat losses through the wall boundary layer were around 12% of the total fuel energy, approximately 9.5% of the total fuel energy was lost due to the convective flow. 7%–8% of convection heat loss was due to the higher emission than absorption of participating CO2 and H2O gasses, and the rest are net soot losses. For the observed operating cases, the computational time is increased nearly double for SLW model than in the simulation without radiation. Finally, the results calculated using SLW indicate an improved agreement with the experimental mean pressure, temperature, soot, and NO concentrations compared to simulations without radiation.

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Comparative study of WSGG and SLW models coupled with control volume finite element method for non gray radiation prediction

Cited by 10 publications

References 28 publications

New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

Heat and mass transfer processes at high-temperature media during combustion of low-grade pulverized coal

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

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