Abstract
In many initiation and ignition mechanisms, the most pronounced and important factors are dynamic activated cavities and gas-containing voids. Loss mechanisms, from gas heating and viscous and radiation losses, can change a dynamic bubble qualitatively in many ways. There are known spontaneous explosions where no adequate stimulus can easily be determined. Examples of soft excitations are physical explosions of liquid gases (retardation of ebullition) and explosives (hydrazoic acid). It is interesting, therefore, to explore whether this simplified bubble model can explain such occurrences. Parametric amplifications are the most powerful and effective in any amplification mechanisms. Produced by stimuli not usually attributable to an excitation, amplification can take place exponentially in time, except in a system in absolute equilibrium. A prerequisite of such an amplification mechanism is that not all factors in the vibration equation are constants; time dependence is required. Bubble vibrations can be driven by different means. A bubble may be pushed by a velocity shock so that a V-motion is activated. The volume V changes when the pressure in a bubble is suddenly released or increased.
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