An experimental study of the ignition conditions (limiting heat source temperature) and characteristics (delay time) for high-porosity condensed materials under local conductive heating is reported. The study has been carried out on dry pine needles, a typical high-porosity combustible forest material. The dependence of the ignition delay for the material on the initial temperature of the heat source—a single cylindrical particle preheated to a high temperature—has been elucidated. A hypothesis concerning the mechanism of ignition of high-porosity condensed materials under local conductive heating has been formulated: the effect of high open porosity on the intensity of heat and mass transfer in the boundary layer of the material in the induction period has been substantiated.
- experimental study
- high-porosity condensed material
- ignition delay
- limiting conditions
- steel particle
ASJC Scopus subject areas
- Physical and Theoretical Chemistry