Vortex Ring Toy
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High Quality Content by WIKIPEDIA articles! The most common vortex toy works by expelling a quantity of air from the toy in such a way as to create a vortex ring. The energy from this vortex is transferred between air particles, in effect moving the vortex downrange. The core region of the vortex ring always consists of the same fluid, as it travels through the fluid. While outside this core the fluid will be set in motion by the approaching vortex ring, move for some time and return to rest after the passage of the ring. That is the way for instance a smoke ring stays visible after quite long...
High Quality Content by WIKIPEDIA articles! The most common vortex toy works by expelling a quantity of air from the toy in such a way as to create a vortex ring. The energy from this vortex is transferred between air particles, in effect moving the vortex downrange. The core region of the vortex ring always consists of the same fluid, as it travels through the fluid. While outside this core the fluid will be set in motion by the approaching vortex ring, move for some time and return to rest after the passage of the ring. That is the way for instance a smoke ring stays visible after quite long distances of travel; while most of the smoke from outside the vortex ring core is left behind in the region near its' source.
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