Dolphins playing with air rings

Discussion in 'General Discussions and Advice' started by chikaboo, 21 Sep 2010.

  1. chikaboo

    chikaboo

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    I hope this works ... its absolutely fascinating ... mind blowing how cool these creatures are ..... Think I must seriously get me a few dolphins :p
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    The attached video is of dolphins playing with rings which they have the
    ability to make under water to play with. It isn't known how they learn
    this, or if it's an inbred ability.

    As if by magic the dolphin does a quick flip of its head and a silver
    ring appears in front of its pointed beak. The ring is a solid, donut
    shaped bubble about 2-ft across, yet it doesn't rise to the surface of
    the water!
    It stands upright in the water like a magic doorway to an unseen
    dimension.

    The dolphin then pulls a small silver donut from the larger one.
    Looking at the twisting ring for one last time a bite is taken from it,
    causing the small ring to collapse into a thousands of tiny bubbles
    which head upward towards the water's surface. After a few moments the
    dolphin creates another ring to play with. There also seems to be a
    separate mechanism for producing small rings, which a dolphin can
    accomplish by a quick flip of its head.

    An explanation of how dolphins make these silver rings is that they are
    'air-core vortex rings'. Invisible, spinning vortices in the water are
    generated from the tip of a dolphin's dorsal fin when it is moving
    rapidly and turning. When dolphins break the line, the ends are drawn
    together into a closed ring. The higher velocity fluid around the core
    of the vortex is at a lower pressure than the fluid circulating farther
    away. Air is injected into the rings via bubbles released from the
    dolphin's blowhole. The energy of the water vortex is enough to keep the
    bubbles from rising for a reasonably few seconds of play time

    Mods if this works plz put it in the appropriate forum and thread .....
     
    Last edited: 21 Sep 2010
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