Heat loss to the interior of a free burning vertical PMMA slab and its influence of estimation of heat of pyrolysis

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    Abstract

    Conduction heat transfer into a vertical free burning PMMA (polymethylmethacrylate) slab as a function of time and distance from the leading edge for clear and black PMMA, and its contribution to the known values of heat of pyrolysis were estimated. The heat conduction into the pyrolyzing surface was deduced from the measured temperatures in the interior of burning slabs. The surface conduction heat flux decreased from 14 kW/m2 for clear PMMA and 13 kW/m2 for black PMMA at t=300 s to almost 8 kW/m2 at around t=1000 s and then reached a plateau, indicating a substantial degree of unsteadiness in the early part of combustion of slabs. It is concluded that, when estimating burning rates in numerical calculations one has to be careful in selecting a value for the heat of pyrolysis because of the generally unsteady nature of heat conduction into the solid interior.

    Original languageEnglish (US)
    Pages (from-to)359-365
    Number of pages7
    JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
    Volume106
    StatePublished - Dec 1 1989

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    Polymethyl Methacrylate
    Heat losses
    Pyrolysis
    Heat conduction
    Heat flux
    Hot Temperature
    Temperature

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

    Cite this

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    title = "Heat loss to the interior of a free burning vertical PMMA slab and its influence of estimation of heat of pyrolysis",
    abstract = "Conduction heat transfer into a vertical free burning PMMA (polymethylmethacrylate) slab as a function of time and distance from the leading edge for clear and black PMMA, and its contribution to the known values of heat of pyrolysis were estimated. The heat conduction into the pyrolyzing surface was deduced from the measured temperatures in the interior of burning slabs. The surface conduction heat flux decreased from 14 kW/m2 for clear PMMA and 13 kW/m2 for black PMMA at t=300 s to almost 8 kW/m2 at around t=1000 s and then reached a plateau, indicating a substantial degree of unsteadiness in the early part of combustion of slabs. It is concluded that, when estimating burning rates in numerical calculations one has to be careful in selecting a value for the heat of pyrolysis because of the generally unsteady nature of heat conduction into the solid interior.",
    author = "Kulkarni, {Anil Kamalakant} and Kim, {C. I.}",
    year = "1989",
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    TY - JOUR

    T1 - Heat loss to the interior of a free burning vertical PMMA slab and its influence of estimation of heat of pyrolysis

    AU - Kulkarni, Anil Kamalakant

    AU - Kim, C. I.

    PY - 1989/12/1

    Y1 - 1989/12/1

    N2 - Conduction heat transfer into a vertical free burning PMMA (polymethylmethacrylate) slab as a function of time and distance from the leading edge for clear and black PMMA, and its contribution to the known values of heat of pyrolysis were estimated. The heat conduction into the pyrolyzing surface was deduced from the measured temperatures in the interior of burning slabs. The surface conduction heat flux decreased from 14 kW/m2 for clear PMMA and 13 kW/m2 for black PMMA at t=300 s to almost 8 kW/m2 at around t=1000 s and then reached a plateau, indicating a substantial degree of unsteadiness in the early part of combustion of slabs. It is concluded that, when estimating burning rates in numerical calculations one has to be careful in selecting a value for the heat of pyrolysis because of the generally unsteady nature of heat conduction into the solid interior.

    AB - Conduction heat transfer into a vertical free burning PMMA (polymethylmethacrylate) slab as a function of time and distance from the leading edge for clear and black PMMA, and its contribution to the known values of heat of pyrolysis were estimated. The heat conduction into the pyrolyzing surface was deduced from the measured temperatures in the interior of burning slabs. The surface conduction heat flux decreased from 14 kW/m2 for clear PMMA and 13 kW/m2 for black PMMA at t=300 s to almost 8 kW/m2 at around t=1000 s and then reached a plateau, indicating a substantial degree of unsteadiness in the early part of combustion of slabs. It is concluded that, when estimating burning rates in numerical calculations one has to be careful in selecting a value for the heat of pyrolysis because of the generally unsteady nature of heat conduction into the solid interior.

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