Abstract
Numerical research of interconnected heat and mass transfer processes in the “two hot particles—polymeric material—air” system was executed. The joint effect of several local heat sources on the main integrated characteristic of ignition process (ignition delay time) was established. Two ignition models characterized by the relative positioning of hot particles on a polymeric material surface were revealed. Besides, there were established characteristics of local heat sources and the distance between them (700 K<Tp<1150 K andL>1.5orTp>1150 K and0.25<L<1.5)when regularities of heat and mass transfer processes in the “two hot particles—polymeric material—air” system are similar to regularities of heat and mass transfer processes in the “single hot particle—polymeric material—air” system.
Highlights
In recent years, polymeric materials have been widely adopted in various industries as decorative and constructive elements
The numerical research results [10, 11] were obtained for thermal conduction and thermal convection processes during a polymeric material ignition by a single metal particle heated to high temperature
Ignition conditions and heat transfer characteristics may be different for the “single hot particle—polymeric material— air” system and the “two hot particles—polymeric material— air” system
Summary
Polymeric materials (polymethyl methacrylate, polystyrene, polyethylene, etc.) have been widely adopted in various industries as decorative and constructive elements. Possible temperatures of technological processes for power production can reach more than 1000 K. Under such conditions, the probability of local power sources (metal and nonmetallic particles warmed to high temperature with sizes about several millimeters) formation is high [5,6,7,8,9]. The numerical research results [10, 11] were obtained for thermal conduction and thermal convection processes during a polymeric material ignition by a single metal particle heated to high temperature. Ignition conditions and heat transfer characteristics may be different for the “single hot particle—polymeric material— air” system and the “two hot particles—polymeric material— air” system. Mathematical Problems in Engineering of thermal conduction in condensed substance and thermal y decomposition of polymeric material, thermal convection, yL and diffusion and oxidation reaction in outside gas area
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