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Mixtures of dispersed combustible materials (such as gaseous or vaporised fuels, and some dusts) and oxygen in the air will burn only if the fuel concentration lies within well-defined lower and upper bounds determined experimentally, referred to as flammability limits or explosive limits.
Definition. Flammability limits refer to the range of concentrations of a combustible substance in air that can sustain a combustion reaction. These limits include a lower flammability limit (LFL) and an upper flammability limit (UFL), defining the minimum and maximum concentrations at which the substance can ignite and burn.
The article begins with a discussion of the importance and challenges of determining flammability limits. It then presents the theoretical, computational, and experimental methods available to understand the mechanism of flammability limits and to quantify them.
The flammability limit defines the minimum and maximum limits for the fraction of fuel in the fuel-air mixture in which ignition leads to the propagation of a sustained combustion flame. From: International Journal of Hydrogen Energy, 2023
What Does Flammability Limit Mean? Flammability limit can be defined as the limit or range of the composition of gases in fixed temperature and pressure conditions within which gaseous vapors can catch fire or an explosive condition is reached when an external source of ignition is introduced.
What Does Flammability Limit Mean? Flammability limit refers to the upper or lower limits of the gaseous or vaporized fuel or combustible material at a fixed temperature and pressure that can lead to flame propagation, detonation or an explosion.
Flammability limits refer to the concentration range of a gas or vapor in air that can ignite and sustain combustion. These limits are crucial because they define the minimum and maximum amounts of fuel that can mix with air for a flame to propagate.