Correlation equations on fire-induced air flow rates through doorway derived by large eddy simulation

Chow, Wan Ki; Zou, G. W.

doi:10.1016/j.buildenv.2004.09.010

Cited by 46 publications

(37 citation statements)

References 13 publications

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“…The cooling performance of a designed enclosure model is checked by numerical thermal flow analysis with a computational fluid dynamics (CFD) code FLUENT (Ju et al, 2004). Correlation equations of mass flow rates proposed by Nakaya et al were studied numerically with FDS (Nakaya et al, 1986;Chow and Zou, 2005). Results analyzed by Chow and Zou are similar to experimental results deduced by Nakaya et al.…”

Section: Introductionsupporting

confidence: 70%

“…The numbers of cells along x, y and z directions are 100(36+2+35+2+25), 36 and 24, respectively. Therefore the total number of the cells is 86400(= 100 × 36 × 24) (Chow and Zou, 2005). The boundary conditions for the room walls are assumed to be thermally insulated and ambient temperature and pressure are 20 o C and 101.325 kPa, respectively.…”

Section: Numerical Analysis and Resultsmentioning

confidence: 99%

“…The burner was located at the center of the burn room. The propane gas of the burner was supplied at the rates of 50, 100, 150, 200, 250, 300 and 350 l/min, which are corresponded to the heat release rates of 86, 171, 257, 342, 428, 514 and 600 kW because the heat of combustion of propane at 25 o C is about 2044 kJ/mol(=46.45 kJ/g), respectively (Nakaya et al, 1986;Chow and Zou, 2005).…”

Section: Numerical Analysis and Resultsmentioning

confidence: 99%

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Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Ju¹,

Kim²

2012

Journal of Korean Society of Hazard Mitigation

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In the case of a fire of two-room's enclosure, the inflow and outflow mass rates through the doorway located between a burn room and an adjacent room have been researched. The objective of this study are to calculate the flow rates through the doorway of the burn room, to study the inflow and outflow coefficients of the doorway, and accurately to predict the neutral-plane height from the floor of the room in the stratified fire cases of the two-room's enclosure. The inflow and outflow mass rates are analyzed by FDS developed by the National Institute of Standard and Technology, USA. The analyzed results by FDS are compared with the experimental results performed by Nakaya et al. By our study it is known that the flow coefficients vary according to fire size and opening configuration and the mean values of the inflow and outflow coefficients are 0.8 and 1.0 respectively.

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Section: Introductionsupporting

confidence: 70%

Section: Numerical Analysis and Resultsmentioning

confidence: 99%

Section: Numerical Analysis and Resultsmentioning

confidence: 99%

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Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Ju¹,

Kim²

2012

Journal of Korean Society of Hazard Mitigation

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“…The outflow is larger for doorway D 23 than for doorway D 12 . The ventilation increases the outflow toward the downstream room L 3 and limits the one toward the upstream room L 1 .…”

Section: Mass Flow Ratesmentioning

confidence: 86%

“…Supported by experiments, correlations have been proposed to estimate the mass flow rate through the opening [6][7][8]. Research is still underway focusing on the generalization of correlations [9,10], comparisons with numerical codes [11,12] and experimental investigation using more detailed measurement techniques such as PIV (particle image velocimetry) [13].…”

Section: Introductionmentioning

confidence: 99%

Doorway Flows Induced by the Combined Effects of Natural and Forced Ventilation in a Three Compartment Assembly

Prétrel¹,

Audouin²

2011

Fire Safety Science - Proceedings of the 10th International Sym

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This research deals with the combined effects of fire and mechanical ventilation on the bidirectional flow occurring at a doorway for a fire scenario with a three compartment assembly. Based on large-scale fire tests, an experimental campaign has been carried out in order to investigate the effect of the ventilation rate and the fire heat release rate on doorway flow. The analysis focused on the velocity profiles at the doorway, the location of the neutral plane and the amplitude of the velocities entering and leaving the fire compartment. The conclusions point out the significant effects of the ventilation on the features of the doorway flow. The mechanical ventilation modified the relative contribution of inflows and outflows and might stop the release of smoke. Moreover, the position of the doorway in relation to the fire location and the direction of the ventilation flow have to be considered. A correlative approach has been proposed to support the analysis.KEYWORDS: compartment fires, smoke, doorway, mechanical ventilation, buoyancy, pressure. NOMENCLATURE LISTING

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Numerical experiments in fire science: a study of ceiling jets

2014

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Summary In this paper, a numerical experiment, consisting of 90 simulations in Fire Dynamics Simulator (FDS), is conducted for two different purposes. Firstly, numerical experiments are explored as a research method in fire science, and it is demonstrated that numerical experiments could be used as a complement to traditional fire experiments in fire science research. Secondly, an evaluation of previously derived correlations for ceiling jet excess temperatures and velocities is performed with the help of the results from the numerical experiment. The procedure used in this evaluation constitutes an outline for how a numerical experiment can be conducted in fire science. The evaluation indicates that the existing correlations will give a good estimate of the average temperature in a ceiling jet calculated by FDS. However, the correlations do not give a good estimate of the maximum excess temperature. A new correlation to estimate the maximum temperature has therefor been developed and is presented in the paper. Copyright © 2014 John Wiley & Sons, Ltd.

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Correlation equations on fire-induced air flow rates through doorway derived by large eddy simulation

Cited by 46 publications

References 13 publications

Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Doorway Flows Induced by the Combined Effects of Natural and Forced Ventilation in a Three Compartment Assembly

Numerical experiments in fire science: a study of ceiling jets

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