CFD and experimental studies of room fire growth on wall lining materials

Yan, Zhenghua; Holmstedt, Göran

doi:10.1016/s0379-7112(96)00044-6

Cited by 61 publications

(25 citation statements)

References 5 publications

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“…Thus, our model is applicable to flame spread over thermally thick and thermally thin materials. This is also true for charring materials (no moving mesh [7] or dual mesh [8] is required for the solution of the equations, and the applicability in three dimensions is an interesting advantage over 'integral type' models [2][3][4][5][6]). …”

Section: Discussion: Relation With Existing Pyrolysis Modelsmentioning

confidence: 99%

“…Indeed, as the only heat transfer mechanism towards the virgin material is by conduction, it is inevitable that, at the moment when the formerly pyrolysing cell becomes pure char, the temperature of the neighbouring virgin cell is still below the pyrolysis temperature. This was already recognised in [8], but the problem was not really solved there. A dual mesh technique was introduced, effectively reducing the mentioned undesired phenomenon, but not solving the problem.…”

Section: Discussion: Zero-th Order Temperature Field Representationmentioning

confidence: 99%

“…This allows the model to be used for multi-dimensional solid-phase treatments, which becomes far more cumbersome with intrinsically one-dimensional pyrolysis models, such as integral type models [2][3][4][5], or with moving mesh [7] or dual mesh [8] models.…”

Section: Model Description -Enthalpy Equationmentioning

confidence: 99%

“…During the past two decades, several researchers have developed numerical models for pyrolysis of charring materials, with different levels of complexity, such as: Arrhenius-type models [1]; 'integral' models [2][3][4][5]; an 'extended' integral model [6]; a moving mesh model [7]; a dual mesh model [8]. A review on pyrolysis modelling has recently been provided in [9].…”

Section: Introductionmentioning

confidence: 99%

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An enthalpy-based pyrolysis model for charring and non-charring materials in case of fire

Wasan

Rauwoens

Vierendeels

et al. 2010

Combustion and Flame

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In a simulation of a developing fire, flame spread must be properly accounted for. The pyrolysis model is important in this respect. To that purpose, we develop a simplified enthalpy based pyrolysis model that is extendable to multi-dimensional solid-phase treatments. This model is to be coupled to gas phase turbulent combustion simulations. The description of the pyrolysis process is simplified in order to acquire short simulation times. In this paper, first, the basic thermodynamic description of pyrolysis phenomena is revisited for charring and non-charring materials, possibly containing moisture. The heat of pyrolysis is defined and its relation to the formation enthalpies of individual constituents is explained.Solving only one equation for enthalpy on a fixed computational mesh, provides a useful description of the transport of heat and the pyrolysis process inside the solid material. Models for e.g. char oxidation or complex transport of the pyrolysis gases or water vapour inside the solid material can be coupled to the present model. Next, numerical issues and implementation are discussed. We consider basic test cases with imposed external heat flux to a solid material that can be dry or contain moisture. We illustrate that continuous pyrolysis gases mass flow rates are obtained when a piecewise linear representation of the temperature field is adopted on the fixed computational mesh. With constant temperature per computational cell, discontinuities, with sudden drops to zero, are encountered, as reported in the literature. We show that the present model formulation is robust with respect to numerical aspects (cell size and time step) and that the model performs well for variable external heat fluxes. For charring and non-charring materials, we validate the model results by means of numerical reference test cases and experimental data. By means of a numerical test case, we show that the model, when coupled to CFD calculations, is able to simulate flame spread.

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Section: Discussion: Relation With Existing Pyrolysis Modelsmentioning

confidence: 99%

Section: Discussion: Zero-th Order Temperature Field Representationmentioning

confidence: 99%

Section: Model Description -Enthalpy Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An enthalpy-based pyrolysis model for charring and non-charring materials in case of fire

Wasan

Rauwoens

Vierendeels

et al. 2010

Combustion and Flame

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show abstract

“…It is more difficult to predict these processes under more realistic fire conditions, which explains why the pyrolysis process is generally ignored in computational fluid dynamics (CFD) modeling and the rate of heat release (RHR) is taken as an input data [2,3]. However, considerable efforts have been expended to develop CFD-based surface flame-spread models (e.g., [4][5][6][7][8][9]). Some of them have been incorporated in widely available CFD codes such as FDS [5], SMARTFIRE [6], SMAFS [7], and SOFIE [9].…”

Section: Introductionmentioning

confidence: 99%

A Blocked-Off-Region Strategy to Compute Fire-Spread Scenarios Involving Internal Flammable Targets

Consalvi¹,

Porterie²,

Loraud³

2005

Numerical Heat Transfer, Part B: Fundamentals

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A finite-volume blocked-off-region procedure is developed to represent internal flammable targets in fire-spread scenarios. In this procedure, the computational domain includes both gas and solid regions. The standard numerical scheme is modified to render hydrodynamically inactive the solid regions and to match the interface conditions at the burning solid surface correctly. A two-grid refinement procedure is used to solve the conjugate heat and mass transfer problem accurately. The first large-scale scenario concerns the flame spread over a vertical panel exposed to a burner flame. Second, the procedure is used to simulate cone calorimeter tests of particle board. For the latter application, the predicted mass loss rates are in qualitative agreement with experimental data.

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A comparison of fire retarded and non-fire retarded wood-based wall linings exposed to fire in an enclosure

et al. 1999

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CFD and experimental studies of room fire growth on wall lining materials

Cited by 61 publications

References 5 publications

An enthalpy-based pyrolysis model for charring and non-charring materials in case of fire

An enthalpy-based pyrolysis model for charring and non-charring materials in case of fire

A Blocked-Off-Region Strategy to Compute Fire-Spread Scenarios Involving Internal Flammable Targets

A comparison of fire retarded and non-fire retarded wood-based wall linings exposed to fire in an enclosure

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