Spectral Photon Monte Carlo With Energy Splitting Across Phases for Gas–Particle Mixtures

Marquez, Ricardo; Modest, Michael F.; Cai, Jian

doi:10.1115/1.4030959

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…Over the past three decades, tremendous advances have been made in developing and applying the MC method to radiation transport in combustion environments [158,160,163,[177][178][179][180][181][182][183][184][185][186][187][188].…”

Section: Monte Carlo (Mc) Methodsmentioning

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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Section: Monte Carlo (Mc) Methodsmentioning

confidence: 99%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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“…where E 0 k j is the energy with which ray j entered cell k. Following [42], this energy is distributed across the gas and spray phases as…”

Section: Energy Accounting Across Phasesmentioning

confidence: 99%

Development of a multiphase photon Monte Carlo method for spray combustion and its application in high-pressure conditions

Roy

Cai

Modest

2017

International Journal of Heat and Mass Transfer

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In this work the development of a multiphase photon Monte Carlo (PMC) method with a focus on resolving radiative heat transfer in combustion simulations is presented. The multiphase PMC solver can account for description of participating media in both Lagrangian and Eulerian frameworks. The solver is validated against exact solutions in several one-dimensional configurations. The developed solver is then applied to Diesel spray combustions, where liquid spray droplets are assumed to be cold, nonemitting, large, and isotropically scattering. Several formulations for radiative properties of the Diesel spray are first explored. The PMC solver has then been coupled with the multiphase spray combustion solver in OpenFOAM and the coupled solver is used for simulations of high pressure Diesel spray combustion. It was found that in typical Diesel spray combustion applications, such as in an internal combustion engine, impact of radiation on the evolution of the liquid spray was insignificant. Although the impact of radiation on the spray was minimal, nongray spectral properties and the assumption of semi-transparency for Diesel spray were found to impact the radiative transfer significantly, while impact of scattering was marginal. Spray radiation was also found not to have much effect on global combustion characteristics in high-pressure engine-relevant configurations. However, a small but noticeable effect on minor species distribution relevant to pollutant formation was observed.

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“…The expensive but accurate Monte Carlo ray tracing (MCRT) method has been applied to combustion applications involving mainly gaseous media [6,7]. In the area of coal combustion, the MCRT method has been applied to solve the radiative transport equation (RTE) [8,9] only recently, due to the recent improvements in computing capabilities. Despite constraints such as high computational cost and long execution times, the MCRT method has the advantage of reproducing exact solution for sufficiently large statistical samples and the ability to treat inhomogeneous participative media and complex geometries with relative ease.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some detailed nongray spectral models are examined in the context of coal combustion [8,12]. Both the full spectrum k-distributions model [12] and the line-by-line (LBL) model [9] have been applied to account for the nongray gaseous properties of coal combustion. For coal particles, models that employ large particle limit assumptions [13], as well as the size-dependent Buckius-Hwang correlations [14] are examined in various coal combustion simulations [9,12,15].…”

Section: Introductionmentioning

confidence: 99%

“…Both the full spectrum k-distributions model [12] and the line-by-line (LBL) model [9] have been applied to account for the nongray gaseous properties of coal combustion. For coal particles, models that employ large particle limit assumptions [13], as well as the size-dependent Buckius-Hwang correlations [14] are examined in various coal combustion simulations [9,12,15]. To quantify the effects of radiative heat transfer in coal combustion, the present study attempts to bring together the most accurate RTE solver and the most accurate spectral models available for both the gaseous and particle phases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of multiphase radiation on coal combustion in a pulverized coal jet flame

Wu¹,

Roy²,

Zhao³

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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The accurate modeling of coal combustion requires detailed radiative heat transfer models for both gaseous combustion products and solid coal particles. A multiphase Monte Carlo ray tracing (MCRT) radiation solver is developed in this work to simulate a laboratory-scale pulverized coal flame. The MCRT solver considers radiative interactions between coal particles and three major combustion products (CO 2 , H 2 O, and CO). A line-by-line spectral database for the gas phase and a size-dependent nongray correlation for the solid phase are employed to account for the nongray effects. The flame structure is significantly altered by considering nongray radiation and the lift-off height of the flame increases by approximately 35%, compared to the simulation without radiation. Radiation is also found to affect the evolution of coal particles considerably as it takes over as the dominant mode of heat transfer for medium-to-large coal particles downstream of the flame. To investigate the respective effects of spectral models for the gas and solid phases, a Planck-mean-based gray gas model and a size-independent gray particle model are applied in a frozen-field analysis of a steady-state snapshot of the flame. The gray gas approximation considerably underestimates the radiative source terms for both the gas phase and the solid phase. The gray coal approximation also leads to under-prediction of the particle emission and absorption. However, the level of under-prediction is not as significant as that resulting from the employment of the gray gas model. Finally, the effect of the spectral property of ash on radiation is also investigated and found to be insignificant for the present target flame.

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Spectral Photon Monte Carlo With Energy Splitting Across Phases for Gas–Particle Mixtures

Cited by 7 publications

References 38 publications

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Development of a multiphase photon Monte Carlo method for spray combustion and its application in high-pressure conditions

Effect of multiphase radiation on coal combustion in a pulverized coal jet flame

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