The effect of a sprinkler on the stability of a smoke layer beneath a ceiling

Bullen, M.L.

doi:10.1007/bf02338883

Cited by 33 publications

(28 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For a single droplet, in accordance with Newton's second law, Bullen [18] presented an equation for the droplet vertical velocity as:…”

Section: Characterization Of the Sprinkler Spray Droplets Propertiesmentioning

confidence: 99%

Studies of Cooling Effects of Sprinkler Spray on Smoke Layer

Li¹,

Yang²,

Huo³

et al. 2008

Fire Saf. Sci.

View full text Add to dashboard Cite

An experimental study was performed to measure the cooling of a smoke layer by water sprays. This was followed by the development of a mathematical model based on the theory of Chow and Tang. The predictions of the model agree well with the experimental measurements. Water sprays investigated in the present work provided significant cooling of the smoke layer. We observed little effect of increasing the water pressure from 50 to 100 kPa on the cooling of the smoke layer. KEYWORDS:

show abstract

“…For a single droplet, in accordance with Newton's second law, Bullen [18] presented an equation for the droplet vertical velocity as:…”

Section: Characterization Of the Sprinkler Spray Droplets Propertiesmentioning

confidence: 99%

Studies of Cooling Effects of Sprinkler Spray on Smoke Layer

Li¹,

Yang²,

Huo³

et al. 2008

Fire Saf. Sci.

View full text Add to dashboard Cite

show abstract

“…The sprinkler spray systems, which can directly control or suppress the fire, are very reliable in protecting buildings against fire [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The smoke logging is a risk to evacuation and fire fighting [1][2][3][4][5][6][7][8][9][10]. However, this behavior was not considered in the most popular zone fire models, such as the latest version of CFAST (6.0).…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of smoke layer with sprinkler spray was studied by Bullen [2] in 1974. A smoke layer assumed with a constant thickness was considered.…”

Section: Introductionmentioning

confidence: 99%

“…So the smoke layer element below the sprinkler nozzle should move downward to penetrate the interface, descend into the lower cool air layer and form a downward "smoke-logging" plume under the sprinkler spray. However, in some experiments reported [2][3][4][5], the smoke layer would still remain stable and no downward "smoke-logging" plume was seen under certain spray conditions. On the other hand, the smoke layer thickness was not even considered in Cooper's model, but it will certainly have a major contribution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A mathematical model on interaction of smoke layer with sprinkler spray

Huo

et al. 2009

Fire Safety Journal

View full text Add to dashboard Cite

A mathematical model was developed for predicting the downward descending behavior of the buoyant smoke layer under sprinkler spray. The behavior of the smoke layer was determined by considering the interaction between the drag force of the sprinkler spray and the buoyancy force of the hot smoke layer itself in the spray region. The smoke layer may be pulled down with its thickness increased at the center of the spray region due to the cooling and drag effects of the sprinkler spray, thus to form a downward "smoke logging" plume. In the mathematical model developed in this paper, the critical condition under which the smoke layer lost its stability, as a serious concern, was predicted. Additionally, the length of the downward plume, which was rarely investigated before, was also further calculated.

show abstract

References

2011

An Introduction to Fire Dynamics

View full text Add to dashboard Cite

The effect of a sprinkler on the stability of a smoke layer beneath a ceiling

Cited by 33 publications

References 1 publication

Studies of Cooling Effects of Sprinkler Spray on Smoke Layer

Studies of Cooling Effects of Sprinkler Spray on Smoke Layer

A mathematical model on interaction of smoke layer with sprinkler spray

References

Contact Info

Product

Resources

About