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  • 1
    Electronic Resource
    Electronic Resource
    Extinction of diffusion flames adjacent to flat surfaces of burning polymers (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 2955-2976 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Extinction of the diffusion flames in the stagnation-point flow above the commercial polymers, poly(methyl methacrylate), polyoxymethylene (two types), polyethylene (three types), and polystyrene, is studied. The extinction data are used in a theory developed to obtain overall rate parameters for gas-phase combustion of these fuels. Calculated overall rate parameters are corrected for surface heat loss by radiation. It is found that radiation corrections are most significant for polyethylene and polystyrene, in part because of their somewhat higher surface temperatures. Surface regression rates and corresponding surface temperatures are measured to aid in the radiation correction. The results are also used in an Arrhenius-type rate expression to obtain overall activation energies for the thermal degradation of these polymers for comparison with the literature. Effects of surface losses on flame extinction are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170191128
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    Paper (German National Licenses)
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  • 2
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    An experimental investigation on flame interaction and the existence of negative flame speeds (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Downstream interaction between two counterflow premixed flames of different stoichiometries are investigated. Various flame configurations are observed and quantified; these include the binary system of two lean or rich flames, the triplet system of a lean and a rich flame separated by a diffusion flame, and single diffusion flames with some degree of premixedness. Extinction limits are determined for methane/air and butane/air mixtures over the entire range of mixture concentrations. Results show that these extinction limits can be significantly modified in the presence of interaction such that a mixture much beyond the flammability limit can still burn if it is supported by a stronger flame. The experiment also demonstrates the existence of negative flames whose propagation velocity is in the same general direction as that of the bulk convective flow. Implications of the present results on the flammability of stratified mixtures and on the modeling of turbulent flames are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Format: text
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  • 3
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    Extinction of premixed flames by stretch and radiative loss (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The extinction of laminar premixed flames by stretch and radiative loss is studied for the model problem of counterflow opposed-jet combustion by using the matched asymptotic expansion technique for the highly temperature sensitive processes of radiative heat loss and large-activation-energy reaction kinetics. Explicit expressions for the critical Damkoehler number at extinction are derived and the influence of upstream vs downstream heat losses assessed. Results show that stretch exerts a much stronger influence than radiative loss on flame extinction.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: International Journal of Heat and Mass Transfer (ISSN 0017-9310); 27; 291-300
    Format: text
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  • 4
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    Theory of interactive combustion of counterflow premixed flames (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The framework of large activation energy asymptotics is used in an investigation of the extinction characteristics of two interacting premixed flames in counterflow configuration, analyzing the interactive combustion modes of two lean premixed flames, two rich premixed flames, and one of each type of flame separated by a diffusion flame. Regions corresponding to symbiotic combustion of two lean or two rich premixed flames exist in which either flame will be extinguished in the absence of the other. Conditions for the existence of superadiabatic flames within mixtures outside of the conventional flammability limit compositions are established, and practical implications of flame interaction for combustion in inhomogeneous mixtures are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combustion Science and Technology (ISSN 0010-2202); 45; 1-2
    Format: text
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