A transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures

Jukka Vaari (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

As water mist fire fighting systems become increasingly common, there is a need to transform the accumulated practical experience to quantitative models. As a contribution to this process, this paper proposes a transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures. The one-zone approach is based on the experimentally observed ability of the water sprays to mix the gas volume of the protected space. From this assumption, the model solves the time evolution of temperature, gas density, gas composition and water mist concentration inside the protected space. The model incorporates a detailed description of the liquid phase (mist droplets) and the evaporation process. The extinguishment of a hydrocarbon flame is predicted based on the adiabatic flame temperature concept. The possibilities and limitations of the model are demonstrated by validation against experimental data from large-scale machinery space fire suppression tests.
Original languageEnglish
Pages (from-to)229-257
JournalFire Safety Journal
Volume37
Issue number3
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

mist
Fog
enclosure
Enclosures
Fires
retarding
Water
water
fire fighting
Gases
Adiabatic flame temperature
Density of gases
flame temperature
gas composition
machinery
gas density
Hydrocarbons
Machinery
sprayers
flames

Keywords

  • water mist
  • suppression
  • zone modelling
  • total flooding
  • machinery space
  • spray fire
  • heptane

Cite this

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abstract = "As water mist fire fighting systems become increasingly common, there is a need to transform the accumulated practical experience to quantitative models. As a contribution to this process, this paper proposes a transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures. The one-zone approach is based on the experimentally observed ability of the water sprays to mix the gas volume of the protected space. From this assumption, the model solves the time evolution of temperature, gas density, gas composition and water mist concentration inside the protected space. The model incorporates a detailed description of the liquid phase (mist droplets) and the evaporation process. The extinguishment of a hydrocarbon flame is predicted based on the adiabatic flame temperature concept. The possibilities and limitations of the model are demonstrated by validation against experimental data from large-scale machinery space fire suppression tests.",
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A transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures. / Vaari, Jukka (Corresponding Author).

In: Fire Safety Journal, Vol. 37, No. 3, 2002, p. 229-257.

Research output: Contribution to journalArticleScientificpeer-review

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AB - As water mist fire fighting systems become increasingly common, there is a need to transform the accumulated practical experience to quantitative models. As a contribution to this process, this paper proposes a transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures. The one-zone approach is based on the experimentally observed ability of the water sprays to mix the gas volume of the protected space. From this assumption, the model solves the time evolution of temperature, gas density, gas composition and water mist concentration inside the protected space. The model incorporates a detailed description of the liquid phase (mist droplets) and the evaporation process. The extinguishment of a hydrocarbon flame is predicted based on the adiabatic flame temperature concept. The possibilities and limitations of the model are demonstrated by validation against experimental data from large-scale machinery space fire suppression tests.

KW - water mist

KW - suppression

KW - zone modelling

KW - total flooding

KW - machinery space

KW - spray fire

KW - heptane

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