Nonlinear dynamics of flashover in compartment fires

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

doi:10.1016/0379-7112(93)90003-9

Cited by 63 publications

(68 citation statements)

References 9 publications

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“…Parametric studies are generated to demonstrate the behavior of the hot layer's temperature in the compartment and its stability behavior due to the variation of three utilized in previous works [16,22]. They are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…A simplified one zone compartment fire model [16] is used as the basis of the present 9 study. While this model can give only an overall picture with no fine details, it contains all the relevant physics and is sufficient for the present purpose, which is to identify the onset of thermal instability leading to flashover.…”

Section: Discussionmentioning

confidence: 99%

“…Physically, the radiant feedback to a fuel surface has been recognized as an important mechanism leading to the onset of flashover [13][14][15][16][17]. Indeed, without the presence of a radiation source such as the compartment wall or soot particulates within the hot gas, a gas layer temperature of 600 C might not be insufficient to generate the required floor heat flux of 20 kW/m 2 required for flashover.…”

Section: Introductionmentioning

confidence: 99%

“…While the zone model cannot predict localized spatial behavior of field variables such as temperature, mass concentration of various species and velocity, the model is generally expected to be sufficiently good in illustrating the key mechanisms leading to flashover, provided that all relevant physical processes are simulated with sufficient accuracy. Another advantage of the zone model is that it can be readily adapted to a nonlinear analysis using computational techniques of non-linear dynamics [16][17][18][19], which can be a powerful approach both in identifying and understanding the key mechanisms leading to flashover.…”

Section: Introductionmentioning

confidence: 99%

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The role of thermal radiation on the initiation of flashover in a compartment fire

Yuen

Chow

2004

International Journal of Heat and Mass Transfer

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Importance of thermal radiation for transition to flashover in a compartment fire will be demonstrated. A one zone model is developed with the objective of capturing the key mechanisms responsible for the initiation of flashover, i.e. physics of flashover. Thermal radiation is shown to be a key point and the inclusion of a three-dimensional radiation model is essential in the development of an accurate understanding of flashover. The 2 heat transfer from the bounding wall of the compartment, the particulate concentration in the hot layer and the ventilation opening are shown to be key parameters which can lead to thermal instability and the resulting initiation of flashover.Nomenclature a = the total potential heat flux generated by the free burning fire, parameter used in Eq.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of thermal radiation on the initiation of flashover in a compartment fire

Yuen

Chow

2004

International Journal of Heat and Mass Transfer

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“…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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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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References

2011

An Introduction to Fire Dynamics

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Nonlinear dynamics of flashover in compartment fires

Cited by 63 publications

References 9 publications

The role of thermal radiation on the initiation of flashover in a compartment fire

The role of thermal radiation on the initiation of flashover in a compartment fire

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

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