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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    title = "A transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures",
    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.",
    keywords = "water mist, suppression, zone modelling, total flooding, machinery space, spray fire, heptane",
    author = "Jukka Vaari",
    year = "2002",
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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

    TY - JOUR

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    PY - 2002

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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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