Interaction of a water mist with a buoyant methane diffusion flame

Downie, Bruce; Polymeropoulos, C. E.; Gogos, George

doi:10.1016/0379-7112(95)00029-1

Cited by 73 publications

(36 citation statements)

References 10 publications

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“…The interaction of water sprays with fires has been modelled computationally in many papers especially during the last two decades [14][15][16][17][18]. However, there is no need to discuss here the state-of-the-art in this field because the present paper is focused on another particular problem.…”

Section: Motion and Evaporation Of Water Dropletsmentioning

confidence: 99%

An infrared scattering by evaporating droplets at the initial stage of a pool fire suppression by water sprays

Dombrovsky

Dembele

Wen

2018

Infrared Physics & Technology

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h i g h l i g h t sAn initial stage of a pool fire suppression is considered. The motion, heating, and evaporation of water droplets are calculated. Focusing of evaporating water droplets in local regions is obtained. A strong infrared scattering by small water droplets is analyzed. The spectral region of a significant infrared scattering is determined. a r t i c l e i n f o b s t r a c tThe computational analysis of downward motion and evaporation of water droplets used to suppress a typical transient pool fire shows local regions of a high volume fraction of relatively small droplets. These droplets are comparable in size with the infrared wavelength in the range of intense flame radiation. The estimated scattering of the radiation by these droplets is considerable throughout the entire spectrum except for a narrow region in the vicinity of the main absorption peak of water where the anomalous refraction takes place. The calculations of infrared radiation field in the model pool fire indicate the strong effect of scattering which can be observed experimentally to validate the fire computational model.

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Section: Motion and Evaporation Of Water Dropletsmentioning

confidence: 99%

An infrared scattering by evaporating droplets at the initial stage of a pool fire suppression by water sprays

Dombrovsky

Dembele

Wen

2018

Infrared Physics & Technology

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“…The heat transfer mechanisms between a methane-air flame front and a water spray or mist have been fully described by Parra et al [4]. Besides the flame extinction mechanisms [5,2,6] and the mitigation effects of the spray [7][8][9][10][11][12][13] are characterized for methane-or propane-air flame. The fine analysis of the above topics is very limited in the literature and some discrepancies are observed between the experimental data and numerical results.…”

Section: Lumped Parameter Analysis: Hydrogen Combustion Under Liquid mentioning

confidence: 99%

On the use of spray systems: An example of R&D work in hydrogen safety for nuclear applications

Joseph-Auguste

Cheikhravat

Chaumeix

et al. 2009

International Journal of Hydrogen Energy

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“…The phase-out of halons and the need for efficient sprinkler systems on commercial ships has sparked a renewed interest in understanding the dynamics of water-mist suppression of fires in large compartments or in multi-compartment enclosures. Downie et al [11] has studied the suppression of a large methane fire subjected to a steady water mist spray from a single hollow cone nozzle mounted above the fire. The large plume to flame thrust ratio in their experiment resulted in negligible direct penetration of the droplets into the fire region.…”

Section: Introductionmentioning

confidence: 99%

Advanced Simulation Tool for Improved Damage Assessment 2) Water-Mist Suppression of Large Scale Compartment Fires

Prasad¹,

Patnaik²,

Kailasanath³

2000

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and 12b. DISTRIBUTION CODE ABSTRACT {Maximum 200 words)This report is the second in a series that discusses the development of an advanced simulation tool for improved damage assessment. In the first report, we adopted a domain decomposition approach, based on the multiblock Chimera technique, to simulate fires in single uncluttered compartments and predicted spread of smoke in multicompartment ship geometries. These simulations demonstrated the capability of the tool to simulate complex flow fields in large multicompartment enclosures.In this report, we focus on simulating water-mist suppression of fires in large enclosures. A two-continuum formulation is used in which the gas phase and the water-mist are both described by equations of the Eulerian form. The water-mist model is coupled with previously developed codes based on the multiblock Chimera technique for simulating fires. Computations are now performed to understand the various physical processes that occur during the interaction of water-mist and fires in large enclosures. Droplet sectional density contours and velocity vectors are used to track the movement of water-mist and to identify the regions of the fire compartment where the droplets evaporate and absorb energy. Parametric studies are performed to optimize various water-mist injection characteristics for maximum suppression. The effects of droplet diameter, mist injection velocity, injection density, nozzle locations and injection orientation on mist entrainment and flame suppression are quantified. Numerical results indicate that for similar injection parameters such as mist injection density, injection velocity and droplet diameter, the time for suppression was smallest for the top injection configuration. Water-mist injection through the side walls, the front and rear walls, and the floor were found to be less efficient than the top injection configuration. These results are compared with our earlier predictions on water-mist suppression of small-scale methanol pool fires and other experimental studies.

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Interaction of a water mist with a buoyant methane diffusion flame

Cited by 73 publications

References 10 publications

An infrared scattering by evaporating droplets at the initial stage of a pool fire suppression by water sprays

An infrared scattering by evaporating droplets at the initial stage of a pool fire suppression by water sprays

On the use of spray systems: An example of R&D work in hydrogen safety for nuclear applications

Advanced Simulation Tool for Improved Damage Assessment 2) Water-Mist Suppression of Large Scale Compartment Fires

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