Everyday there are tiny implosions that occur in sinks, pipes, even in lakes behind boats.
This low pressure causes the water to boil at ambient temperatures of the fluid, so, small steam bubbles are created due to boiling. These steam bubbles then implode due to the surrounding pressure of the water, then form again due to the energy transferred from the implosion. This principle can be seen in the following GIF of a bullet entering the water.For marine engineers, cavitation is desperately avoided.
However, modern engineers mitigate cavitation through innovative propeller design. In fact, the following video about the USS Pennsylvania—an American submarine—is a perfect example:Cavitation happens wherever water undergoes a rapid change in velocity, causing significant long-term damage. This shortens the lifespan of impeller pumps, which makes their design a tricky proposition.
Cavitation is only one example of the extremely powerful and destructive effects of physics around us. To those unaware, it is a great unseen danger to engineers around the world.
France Dernières Nouvelles, France Actualités
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