Evaporation, theory Explosions

Another theory of liquid-liquid explosion comes from Board et al. (1975). They noticed that when an initial disturbance, for example, at the vapor-liquid interface, causes a shock wave, some of the liquid is atomized, thus enhancing rapid heat transfer to the droplets. This action produces further expansion and atomization. When the droplets are heated to a temperature equal to the superheat temperature limit, rapid evaporation (flashing liquid) may cause an explosion. In fact, this theory resembles the theory of Reid (1979), except that only droplets, and not bulk liquid, have to be at the superheat temperature limit of atmospheric pressure (McDevitt et al. 1987). 

The theory explains why a succession of shocks may occur in BLEVEs. A first shock is produced by the escape of vapor, a second by evaporating liquid, a third by the second shock of the oscillating fluid bubble, and possible additional shocks produced by combustion of released fluid. It is also possible for these shocks to overlap each other, especially at greater distances from the explosion. 

Meanwhile, in 1938 at the AS USSR Institute of Chemical Physics A. F. Belyaev showed that the combustion of liquid explosives occurs in the gas phase after their evaporation. In analogy with this, Ya.B. proposed a theory of combustion of a solid powder (24) according to which the powder is heated in the solid phase and then decomposes, transforming into a gas it is only in the gas phase, at some distance from the surface, that the bulk of the chemical energy is released. Ya.B. also pointed out the peculiar effects of... 

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