Experimental investigation on spray characteristics of twin-fluid nozzle for water mist and its heptane pool fire extinguishing performance

In this study, the effects of discharge area and atomizing gas type in a twin-fluid atomizer on heptane pool fire-extinguishing performance were investigated under the heat release rate conditions of 1.17 and 5.23 kW in an enclosed chamber. Large and small full cone twin-fluid atomizers were prepared. Nitrogen and air were used as atomizing gases. With respect to the droplet size of water mist, as the water and air flow rates decreased and increased, respectively, the Sauter mean diameter (SMD) of the water mist decreased. The SMD of large and small atomizers were in the range of approximately 12–60 and 12–49 μm, respectively. With respect to the discharge area effect, the small atomizer exhibited a shorter extinguishing time, lower peak surface temperature, and higher minimum oxygen concentration than the large atomizer. Furthermore, it was observed that the effect of the discharge area on fire-extinguishing performance is dominant under certain flow rate conditions. With respect to the atomizing gas type effect, nitrogen and air appeared to exhibit nearly similar extinguishing times, peak surface temperatures, and minimum oxygen concentrations under most flow rate conditions. Based on the present and previous studies, it was revealed that the effect of atomizing gas type on fire-extinguishing performance is dependent on the relative positions of the discharged flow and fire source.

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Spray Characteristics Determination of Water Mist for Suppressing Pool Fire

10.1063/1.2747476 ◽

2007 ◽

Author(s):

Li G. Zheng ◽

Ming G. Yu ◽

Shui J. Yu ◽

Zhi C. Liu

Keyword(s):

Water Mist ◽

Pool Fire ◽

Spray Characteristics

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A study of the probability distribution of pool fire extinguishing times using water mist

Process Safety and Environmental Protection ◽

10.1016/j.psep.2014.05.009 ◽

2015 ◽

Vol 93 ◽

pp. 240-248 ◽

Cited By ~ 18

Author(s):

Tianshui Liang ◽

Mengjie Liu ◽

Zhonglin Liu ◽

Wei Zhong ◽

Xiukun Xiao ◽

...

Keyword(s):

Probability Distribution ◽

Water Mist ◽

Pool Fire ◽

Fire Extinguishing

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Effects of Spray Characteristics of Water Mist on The Extinction of a Liquid Pool Fire

Transactions of the Korean Society of Mechanical Engineers B ◽

10.3795/ksme-b.2004.28.12.1591 ◽

2004 ◽

Vol 28 (12) ◽

pp. 1591-1599

Keyword(s):

Water Mist ◽

Liquid Pool ◽

Pool Fire ◽

Spray Characteristics

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Experimental and Numerical Study on the Suppression of Pool Fire with Water Mist

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.790.686 ◽

2013 ◽

Vol 790 ◽

pp. 686-689

Author(s):

Chen Jian ◽

Xu Yan Ying ◽

Wang Yan Sheng

Keyword(s):

Systems Engineering ◽

Numerical Study ◽

Fire Suppression ◽

Inhibitory Effect ◽

Water Mist ◽

Pool Fire ◽

Optimized Design ◽

Operating Pressure ◽

Fire Extinguishing ◽

Oil Pool

The objective of this work is to investigate the diesel analog pool fire with water mist .For this purpose, a series of water mist fire suppression experiment are carried out by changing the nozzle operating pressure, the source of fire power, opening and closing the exhaust fan to analyze the inhibitory effect of water mist to oil pool fire in the enclosed compartment of 5.0m × 5.0m × 3.0m. The results shows that extinguishing efficiency first increases and then decreases when the nozzle operating pressure increases from 8MPa to 12MPa, reaching the highest efficiency at 10MPa; increasing the power of the source of fire, the burning speed increases and the water mist fire extinguishing efficiency decreases; fresh oxygen coming in when smoke exhaust fan is turned on and water mist fire suppression efficiency decreases. Using FDS to simulate the water mist extinguishing oil pool fire, the predict temperature field and extinguishing time are basically consistent with the experimental results. In the actual applications of water mist fire suppression systems engineering, we can use the FDS field simulation methods to predict the characteristic parameters variation of the fire fighting fire temperature and component concentration, which is significant to the fire extinguishing system optimized design.

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Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Fire Safety Journal ◽

10.1016/j.firesaf.2016.05.006 ◽

2016 ◽

Vol 83 ◽

pp. 90-98 ◽

Cited By ~ 9

Author(s):

Yusuke Koshiba ◽

Shinji Okazaki ◽

Hideo Ohtani

Keyword(s):

Experimental Investigation ◽

Water Mist ◽

Fire Extinguishing

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A Study on the New Portable Effervescent Atomized Water Mist Equipment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.392.116 ◽

2013 ◽

Vol 392 ◽

pp. 116-121

Author(s):

Qiang Liang ◽

Yan Feng Li ◽

Guo Cai Yao ◽

Xue Fei Xing

Keyword(s):

Heat Flux ◽

Fire Suppression ◽

Water Mist ◽

Pool Fire ◽

Radiation Heat ◽

Radiation Heat Flux ◽

Wood Crib ◽

Fire Extinguishment ◽

Fire Extinguishing ◽

Atomized Water

A new effervescent atomized water mist fire extinguishing equipment was developed by combining the characters of water mist and effervescent atomization. A series of wood crib and gasoline pool fire suppression experiments were performed using the equipment. The fire extinguishment time, temperature and radiation heat flux of the flame were measured, and then the process of putting out different type fire was analyzed. A wood crib fire of 0.6A can be put out in 180 seconds using water mist produced by effervescent atomization equipment. Only 38 seconds was taken to suppress a gasoline fire.

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