The interaction of thermal radiation and water mist in fire suppression

Yang, Wenhua; Parker, Terry; Ladouceur, H. D.; Kee, Robert J.

doi:10.1016/j.firesaf.2003.07.001

Cited by 57 publications

(29 citation statements)

References 15 publications

(27 reference statements)

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“…(Cheung, 2009) • With an increasing fi re size, the attenuation of radiation also increases (Cheung, 2009)/ another source states that when a source radiates at lower temperatures (energy in longer wavelengths) there is easier attenuation. (Yang et al, 2003) • With a decreasing nozzle diameter, the attenuation of radiation increases → production of fi ner droplets (3/8" is better than 7/16"); Nozzle 3/8" -approved by NFPA. (Cheung, 2009) • They also have a signifi cant cooling effect.…”

Section: Water Curtains and Their Characteristicsmentioning

confidence: 99%

“…(Cheung, 2009, Yang et al, 2003 -Droplets from several tens to several hundred μm have strong absorptive and anisotropic scattering characteristics, whereas water vapour and CO 2 only absorb radiation (depending on the wavelength). (Boulet et al, 2006) • The maximum attenuation factor of radiation was achieved when the radius of droplets was approximately equal to IR -wavelength (0.6 -25 μm) (Cheung, 2009, Ravigururajan et al, 1989)/ another source states that the spray provided maximum blocking effi ciency when the droplet diameter was the same order as the maximum emission wavelength of the source.…”

Section: Water Curtains and Their Characteristicsmentioning

confidence: 99%

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Attenuation of Infrared Radiation When Passing Through a Water Curtain

Balner¹,

Barčová²,

Dostál³

2017

TRANSACTIONS of the VŠB – Technical University of Ostrava, Safety Engineering Series

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Abstract:This article focuses on the interaction of infrared (IR) radiation with water droplets. The main objective of the article is the production of water mist in order of evaluation the reduction in intensity of IR radiation. In the experiments described in this paper, a set of fi ve different nozzles was used with various spray characteristics. The respective nozzles were gradually located between the IR radiation source and a detector and the attenuation of IR radiation was assessed. The reduction in IR radiation intensity was determined and IR radiation transmittance was calculated for the respective tested nozzles.

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Section: Water Curtains and Their Characteristicsmentioning

confidence: 99%

Section: Water Curtains and Their Characteristicsmentioning

confidence: 99%

Attenuation of Infrared Radiation When Passing Through a Water Curtain

Balner¹,

Barčová²,

Dostál³

2017

TRANSACTIONS of the VŠB – Technical University of Ostrava, Safety Engineering Series

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“…This was done using a built compartment with two different fire sources for comparison. The effect of water droplets on the suppression of fire and as a shielding mechanism has been the subject of many studies [7][8][9][10][11][12][13][14][15][16][17]. Kermida [7] found the ability of water droplets to suppress fires is due to the following four methods; gas phase cooling, oxygen dilution, fuel bed cooling, and radiation attenuation.…”

Section: Introductionmentioning

confidence: 99%

“…This study utilized the ability of water to attenuate radiation to reduce the heat flux leaving the compartment. The main mechanisms involved are radiation absorption and scattering by water droplets [7][8][9][10][11][12][13]. Chow [14] and Choi [15] performed similar experiments in order to determine if a room could be protected from a fire in an adjacent room with the use of a water curtain.…”

Section: Introductionmentioning

confidence: 99%

“…Chow [14] and Choi [15] performed similar experiments in order to determine if a room could be protected from a fire in an adjacent room with the use of a water curtain. Studies have investigated the ability of water curtains as a shield to protect property [11,12,17,18]. This research was undertaken to determine if the This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.…”

Section: Introductionmentioning

confidence: 99%

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Investigation into the use of a water curtain over openings to prevent fire spread

Turco

Lhotsky²,

Hadjisophocleous

2016

MATEC Web of Conferences

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Abstract. This paper presents the results of several full-scale experiments to study heat radiation attenuation and shielding using sprinklers to create a water curtain between a compartment fire and a target wall. This work builds on the concept that water absorbs and scatters heat radiation and applies it as a shielding mechanism, which can be used to protect personnel and property exposed to an opening during a compartment fire. The purpose of the study is to determine the effectiveness of a water curtain created using sprinkler heads in attenuating the heat flux from flames exiting a compartment fire, shielding the target wall and preventing fire spread. The results show that the water curtain reduces heat flux to the target wall which may allow for decreasing the building distance from the property line. Heat fluxes along the target wall are compared to heat fluxes required for the piloted ignition of wood products. The effects of fire size, sprinkler system flow rate, and separation distance to the target wall are discussed.

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Attenuation of thermal radiation through water mist

Balner

Barčová

2017

Process Safety Progress

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This article focuses on the interaction of thermal radiation with water droplets and the creation of water mist for the purpose of evaluating the decrease of heat flux when positioning a water curtain of various parameters between a radiation source and a radiometer. The change of water curtain parameters, affecting the passing through of thermal radiation, was performed using five nozzles with a variable spray characteristics. For the respective nozzles the attenuation of thermal radiation was determined and the thermal radiation transmittance was calculated. Water mist was created using a high‐pressure pump and nozzles with a different size of the orifice. The measurement of droplet size was performed using the time‐shift technique. The Omegalux radiant panel was used as the radiation source and the Hukseflux SBG01 radiometer with a working range of 0–5 kW.m−2 was used as the detector. © 2017 American Institute of Chemical Engineers Process Process Saf Prog 37:18–24, 2018

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The interaction of thermal radiation and water mist in fire suppression

Cited by 57 publications

References 15 publications

Attenuation of Infrared Radiation When Passing Through a Water Curtain

Attenuation of Infrared Radiation When Passing Through a Water Curtain

Investigation into the use of a water curtain over openings to prevent fire spread

Attenuation of thermal radiation through water mist

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