Studies on Smoke Temperature Distribution in a Building Corridor Based on Reduced-scale Experiments

Zhou, Jin; Mao, Jinfeng; Huang, Yan; Xing, Zheli

doi:10.3130/jaabe.16.341

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…This activation temperature is typical of commercial water mist and sprinkler systems [53]; Due to the high temperature, the relative humidity of the air falls to 3%. (ii) Condition 2: the smoke layer temperature is raised to 150 • C. The temperature of a smoke layer produced by fire usually varies between 100 and 180 • C and can reach up to 200 • C [54][55][56][57] based on the distance from the fire source. Therefore, an average value of 150 • C is considered for the analysis.…”

Section: Resultsmentioning

confidence: 99%

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The Behaviour of Water-Mists in Hot Air Induced by a Room Fire: Effect of the Initial Size of Droplets

Mahmud

Thorpe

Moinuddin

2022

Fire

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This paper presents work on investigating the effect of the initial size of water mist droplets on the evaporation and removal of heat from the fire-induced hot gas layer while travelling through the air in a compartment. The histories of the temperature, diameter and position of droplets with different initial diameters (varied from 100 µm to 1000 µm) are determined considering surrounding air temperatures of 75 °C and 150 °C and a room height of 3.0 m. A water droplet evaporation model (WDEM) developed in a previous study (Fire and Materials 2016; 40:190–205) is employed to navigate this work. The study reveals that tiny droplets (for example, 100 µm) have disappeared within a very short time due to evaporation and travelled a very small distance from the spray nozzle because of their tiny size. In contrast, droplets with a larger diameter (for example, 1000 µm) reached the floor with much less evaporation. In the case of this study, the relative tiny droplets (≤200 µm) have absorbed the highest amount of energy from their surroundings due to their complete evaporation, whereas the larger droplets have extracted less energy due to their smaller area/volume ratios, and their traverse times are shorter. One of the key findings of this study is that the smaller droplets of spray effectively cool the environment due to their rapid evaporation and extraction of heat from the surroundings, and the larger droplets are effective in traversing the hot air or smoke layer and reaching the floor of the compartment in a fire environment. The findings of this study might help in understanding the behaviour of water-mist droplets with different initial diameters in designing a water-mist nozzle.

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Section: Resultsmentioning

confidence: 99%

“…(ii) Condition 2: the smoke layer temperature is raised to 150 °C. The temperature of a smok layer produced by fire usually varies between 100 and 180 °C and can reach up to 200 °C [54][55][56][57] based on the distance from the fire source. Therefore, an average value of 150 °C is considered for the analysis.…”

Section: Resultsmentioning

confidence: 99%