Computational modelling and simulation of forward-smouldering of porous media in a fixed bed

Ghabi, Chekib; Benticha, H.; Sassi, Mohamed

doi:10.1504/pcfd.2007.013889

Cited by 4 publications

(4 citation statements)

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“…Previous 2D studies showed peripheral extinction [24,36,38,39] with the centerline self-sustaining smouldering weakening to global quenching (i.e., complete extinction) by increasing radial heat losses (e.g., H > 20 W/m 2 K). Heat losses also lowered temperatures [36,44] and oxygen consumption near the wall in comparison to the centerline [42]. Increasing the radial heat loss decreased the smouldering front velocity because of decreasing temperature and reaction rate (i.e., char mass fraction distribution) [36,38,41] and, by increasing the radial heat transfer coefficient from 20 to 100 W/m 2 K, the maximum temperature and smouldering front velocity decreased to roughly one third [43].…”

Section: Introductionmentioning

confidence: 93%

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Investigation of multi-dimensional transfer effects in applied smouldering systems: A 2D numerical modelling approach

Miry

Zanoni

Rashwan

et al. 2022

Combustion and Flame

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Section: Introductionmentioning

confidence: 93%

“…oxygen mass fraction [40,42], heat release rate [36], and chemistry distribution that affect the smouldering front shape, velocity, and propagation [20,24,37,43].…”

Section: Introductionmentioning

confidence: 99%

Investigation of multi-dimensional transfer effects in applied smouldering systems: A 2D numerical modelling approach

Miry

Zanoni

Rashwan

et al. 2022

Combustion and Flame

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“…The solid phase' characteristics are defined using the char and ash mass fraction. The effect of radiation is modeled in the optically thick limit; using the Rosseland approximation (Ghabi et al, 2007a). We introduce radiation conductivity rad k , the total thermal conductivity of the solid s k is:…”

Section: B Heat and Mass Transfer Coefficientsmentioning

confidence: 99%

Computational Model of Smoldering Combustion in Polyurethane Foam

2019

JAFM

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Smoldering phenomenon can be described as a slow, low-temperature, flameless form of combustion, sustained by heterogeneous reactions with oxygen occurring at the surface of a condensed-phase fuel. In this work a computational study on the smoldering ignition and propagation in polyurethane foam is carried out. First, we investigated numerically the heat transfer and the fluid flow in porous media using the generalized lattice Boltzmann method (LBM). Our appropriate code is validated through the study of a thermal injected flow. LBM results are compared to analytical solutions and numerical results obtained using the Finite Difference Method. Second, the numerical model is extended to account for chemical reactions. We introduce the two-dimensional, transient, governing equations for smoldering combustion in a porous fuel. The model describes opposed and forward propagation according to appropriate assumptions. The kinetics model is based on a three-step mechanism. The temperature and char mass fraction profiles are studied at different cross-sections. Obtained results are compared to literature solutions. At the beginning, the important quantity of char is produced near the ignited boundary. To follow the phenomenon, the isotherms are presented at different instants. The results reproduce the features of the smoldering process and represent a significant step forward in smoldering combustion modeling.

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“…The coefficients g i are determined from the optimized experimental analysis found in (Ghabi et al, 2007). However, they are assumed to be constant and do not depend on temperature.…”

Section: Reactions Of Pyrolysismentioning

confidence: 99%

Two-Dimensional Computational Modeling and Simulation of Wood Particles Pyrolysis in a Fixed Bed Reactor

Ghabi¹,

Benticha²,

Sassi

2008

Combustion Science and Technology

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A two-dimensional theoretical and numerical model of biomass pyrolysis has been developed to determine the kinetic of wood particles pyrolysis in a fixed bed reactor. The adopted chemical model is coupled with a global transport bi-dimensional, and two temperatures model. The three modes of heat transfer (conduction, convection and/or radiation) between the solid and gas phases, and the wall are considered. The system of all unsteady and reactive equations is resolved by a finite volume method with a hybrid spatial interpolation and an implicit interpolation for time. The resulting algebraic equations are then resolved by using the bi-conjugate gradient stabilized and normalized method. The obtained model is validated in several experimental cases for data of one biomass particle. This model is applied to predict the pyrolysis phenomenon in a fixed bed of particles. Using the proposed numerical model the time space evolutions, of temperature and char fraction, are presented and discussed. In this configuration, the obtained numerical results agree with the experimental data found in the literature.

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Computational modelling and simulation of forward-smouldering of porous media in a fixed bed

Cited by 4 publications

References 0 publications

Investigation of multi-dimensional transfer effects in applied smouldering systems: A 2D numerical modelling approach

Investigation of multi-dimensional transfer effects in applied smouldering systems: A 2D numerical modelling approach

Computational Model of Smoldering Combustion in Polyurethane Foam

Two-Dimensional Computational Modeling and Simulation of Wood Particles Pyrolysis in a Fixed Bed Reactor

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