Experimental and theoretical models of flashover

Holborn, P.G.; Bishop, Steven R.; Drysdale, Dougal; Beard, Alan N.

doi:10.1016/0379-7112(93)90030-t

Cited by 26 publications

(33 citation statements)

References 3 publications

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“…Similarly to the behaviour depicted in [2], a sudden drop was predicted. Although consistent with the predictions, the small number of reduced-scale experiments presented in [4] makes the comparison rather limited. A more detailed and comprehensive model for a fully-developed fire has been developed in [7], based on a well-stirred reactor approach (i.e., the gas is assumed to have uniform properties throughout the compartment).…”

Section: Introductionsupporting

confidence: 53%

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Assessment of the Burning Rate of Liquid Fuels in Confined and Mechanically-Ventilated Compartments using a Well-Stirred Reactor Approach

Beji

Merci

2014

Fire Technol

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The objective of this work is to provide a 'support tool' to assess the burning rate of a pool fire in a well-confined and mechanically-ventilated room using a single-zone model based on conservation equations for mass, energy and oxygen concentration. Such configurations are particularly relevant for nuclear facilities where compartments are generally sealed from one another and connected through a ventilation network. The burning rates are substantially affected by the dynamic interaction between the fuel mass loss rate and the rate of air supplied by mechanical ventilation. The fuel mass loss rate is controlled by (i) the amount of oxygen available in the room (i.e. vitiation oxygen effect) and (ii) the thermal enhancement via radiative feedback from the hot gas to the fuel surface. The steady-state burning rate is determined by the 'interplay' and balance between the limiting effect of oxygen vitiation and the enhancing effect of radiative feedback. An extensive sensitivity study over a wide range of fuel areas and mechanical ventilation rates shows that a maximum burning rate may be obtained.

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Section: Introductionsupporting

confidence: 53%

“…A large body of the literature has been devoted to a comprehensive characterization of naturally-ventilated enclosure fires (e.g. [1][2][3][4][5][6][7][8][9][10][11]), whereas fewer studies have focused on mechanically-ventilated room fires (e.g. [12][13][14][15][16][17]).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Burning Rate of Liquid Fuels in Confined and Mechanically-Ventilated Compartments using a Well-Stirred Reactor Approach

Beji

Merci

2014

Fire Technol

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“…2. where we have used the same example of a 0.4m cubical compartment as used in [3] for a, = 0.0138P '(1 -P)will vary continuously with P. In the two extreme cases P = 0,l the critical relationship in the plane of the parameters a,, a, is the same [5]. In Figure 2 the two lines plotted for these cases coincide exactly.…”

Section: The Critical Conditionsmentioning

confidence: 53%

“…Further development of this approach has also been made by Bishop et al [2], and Holborn et al [3,41 with the application of modem nonlinear dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows the critical dimensionless temperature for the range of values of P. The example of a 0.4m cubical compartment as used in [3] with an 185x185 mm2 fuel tray and a O.lm opening width was used. In addition to the data in [3] the height of the discontinuity above the floor was taken to be half the room height, and the emissivity of smoke was taken to be unity. The values of the governing parameters also vary with thermal inertia.…”

Section: Critical Temperaturementioning

confidence: 99%

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On Zone Models For Flashover

Graham¹,

Makhviladze²,

Roberts³

1997

Fire Safety Science - Proceedings of the 5th International Symp

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A zone model for the developmeii~ of a fire in a single compartment with one opening is studied to obtain explicit formulae for the critical conditions for occurrence of flashover and its temporal characteristics. In addition to previous studies, generalisation is presented for walls of arbitrary thermal inertia. The correlation between the model and previous models is also examined. Under reasonable assumptions all models are shown to be described by the same mathematical problem. This suggests that the formulae obtained for critical conditions and temporal characteristics can be used for any of the models observed. Results are illustrated for an experimental fire box used in many experiments.

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References

2011

An Introduction to Fire Dynamics

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Experimental and theoretical models of flashover

Cited by 26 publications

References 3 publications

Assessment of the Burning Rate of Liquid Fuels in Confined and Mechanically-Ventilated Compartments using a Well-Stirred Reactor Approach

Assessment of the Burning Rate of Liquid Fuels in Confined and Mechanically-Ventilated Compartments using a Well-Stirred Reactor Approach

On Zone Models For Flashover

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