Implosion
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Implosion is a reverse explosion that concentrates matter and energy. Buildings are colloquially described to implode when demolished through explosives, causing them to collapse on themselves. Implosion is the inward collapse, the opposite of explosion. A hollow sphere of Plutonium may be imploded by spherical explosive charges to trigger a fission bomb, which itself may contain and be an implosive trigger for a fusion bomb.
In the context of cavitation, implosion is a suctional process that causes matter to move inwards, not outwards as is the case with explosion. This inward (centripetal) motion, however, does not follow a straight (radial) path to the centre; it follows a spiralling, whirling path. This is called a vortex. In cavitation, a number of small bubbles of water vapor are created by the low pressure on one side of a propellor. When these bubbles collapse they can produce intense local shock waves which create noise and can cause local failure at the propellor's surface, a process leading to material erosion.
A characteristic feature of a vortex is that the outside of the vortex moves slowly and the centre moves fast. As water is imploded in a vortex, suspended particles, which are denser than water, are sucked into the centre of flow, frictional resistance is reduced and the speed of the flow is increased.
One of the great researchers of implosion in nature was Viktor Schauberger (1885-1958).de:Implosion nl:implosie pl:Implozja (fizyka)