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Dolphin Bubbles
Old 03-17-2009, 06:39 AM   #1
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Dolphin Bubbles

This is really cool, if you're interested in animal behavior.



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Old 03-17-2009, 08:32 AM   #2
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That is cool - thanks for sharing.

I was interested in the science behind it and found this...
Dolphins create bubble rings by blowing air in a water vortex ring: by flipping a fin they create a vortex ring of water. The then blow air in the ring, which goes to the center of the vortex ring. In the water vortex ring the natural location of the air is in the center of the vortex. When air and water move in a circular path like they do in the vortex ring, air and water are separated due to the centripetal force. Since density of water is larger than air, water moves at the outside, while the air ends up in the middle.
Deep Ocean Diving - Science, technology and medicine related to scuba diving

There's a paper that focuses more on the social aspects of the behavior here:

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Old 03-17-2009, 08:46 AM   #3
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I was pretty skeptical -- this looks gravity-defying to me. But according to this is valid.

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Old 03-17-2009, 01:28 PM   #4
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That was amazing - TY for posting.
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Old 03-17-2009, 03:13 PM   #5
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Next they will work on Lissajous figures. Neat the way the manipulate the air rings. Thanks for the post.
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Old 03-17-2009, 07:47 PM   #6
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Totally cool. DW and I both appreciate the post.

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