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- W1964352803 abstract "A numerical model is developed to predict endothermic pyrolysis and piloted ignition delay of solid composite materials exposed to an external radiant heat flux. The model considers the coupled thermochemical processes that take place in the condensed phase and therefore describes the piloted ignition of solid combustible materials only under conditions of fast chemical kinetics in gas phase. The condensed phase processes considered in the model include oxidative and thermal pyrolysis, phase change, radiation absorption, and heat and mass transfer in a multiphase and multicomposition medium. Ignition is considered to occur when a critical pyrolysate mass flow is reached at the composite surface. The implication is that the ignition of the material is subjected to the attainment of a minimum concentration of fuel in the gaseous mixture adjacent to the pilot (lean flammability limit). The ignition delay is predicted over a wide range of external heat fluxes for polypropylene/fiberglass composite with varied composition and thickness. The results agree well with the available experimental data and show that the ignition delay and critical external heat flux for ignition depend on the composition of the material, increasing as the fiber content is increased. From the results it is possible to identify the fiberglass content required to prevent ignition at a given radiant flux, a result that could provide guidelines toward the development of fire-safe composites. Finally, based on the ignition delay, it is possible to identify three categories of fuel thickness: thermally thin, transition, and thermally thick, each representing a distinct ignition delay." @default.
- W1964352803 created "2016-06-24" @default.
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- W1964352803 date "2000-01-01" @default.
- W1964352803 modified "2023-09-30" @default.
- W1964352803 title "Numerical modeling of endothermic pyrolysis and ignition delay of composite materials exposed to an external radiant heat flux" @default.
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- W1964352803 doi "https://doi.org/10.1016/s0082-0784(00)80698-0" @default.
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