EXTINCTION OF DISPERSED HETEROGENEOUS SYSTEMS

We consider extinction, of various dispersed systems. Isolated boron p articles and boron particles in gases are studied. Stability analysis of steady-state thermal regimes of reacting heterogeneous systems for the case of two parallel reactions on the reaction surface using the F rank-Kamenetskii method gives extinction conditions in. oxygen-contain ing media. Curves of the extinction particle size versus the ambient t emperature, oxidizer concentration, and, for particles in gases, also versus the oxidizer-to-fuel ratio are plotted. Approximate analytical calculations showed that the extinction process can be most actively c ontrolled by varying the combustion temperature: a decrease in the lat ter increases the extinction particle size and decreases the completen ess of fuel combustion It is shown that at low ambient temperatures th e extinction particle size for suspensions is larger than that for iso lated particles. This effect is caused by a decrease in the oxidizer c oncentration during combustion of suspensions. At high temperatures, t he role of this factor weakens.