Ultrasonically generated cavities (microvacuum nuclei group) Detonation and explosion 2024/4/16
To explain the behavior of ultrasonic cavities, I have explained that at 20 KHz, a shock wave is generated outward from the central core of the cavity in about 1/40,000 of a second (positive shock wave), and in the next 1/40,000 of a second a shock wave is generated toward the central core (negative shock wave). This process repeats 20,000 times per second.
However, now that we have some control over the speed of annihilation and the speed of negative shock waves, I think a different expression may be easier to understand.
That is, positive shock wave = explosion, negative shock wave = deflagration. Explosion and deflagration are repeated 20,000 times per second. This is the principle of ultrasonic cleaning. And now, we are conducting an experiment to utilize the shock force of implosion and contraction to create a new material. by shibano