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Amazing Dolphin Video: Playing with bubble rings

 
 
Reply Wed 1 Oct, 2008 01:00 am
I would be impressed as hell to see a human do this, but a dolphin?!

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Type: Discussion • Score: 1 • Views: 3,627 • Replies: 6
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OGIONIK
 
  1  
Reply Wed 1 Oct, 2008 01:05 am
@Robert Gentel,
amazing.
0 Replies
 
rosborne979
 
  1  
Reply Wed 1 Oct, 2008 02:10 pm
@Robert Gentel,
That was incredible. If I didn't see it on YouTube I wouldn't believe it Smile

Robert Gentel
 
  1  
Reply Wed 1 Oct, 2008 02:17 pm
@rosborne979,
Sounds like you still don't:

THE PHYSICS OF BUBBLE RINGS AND OTHER DIVER'S EXHAUSTS

Quote:
Bubble rings are an example of vortex rings. Other vortex rings are smoke rings blown by the experienced smoker.

There are few ways on how bubble rings can be created:

1. Rings can be created by letting air escape through an orifice that is opened and closed abruptly. A bubble-blowing diver falls in this category.
2. Rings can be created by letting a fixed amount of air escape through an orifice that is permanently opened. The bubble machine of David Whiteis falls in this category
3. 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.


Here is video of a scuba diver doing it:


rosborne979
 
  1  
Reply Wed 1 Oct, 2008 02:26 pm
@Robert Gentel,
Quote:
Sounds like you still don't:

I was just making a sly jab at the fact that we get so much of our information now from a medium which can be so easily faked. In this particular case I believe it because I've seen bubble rings before. But there's gonna come a time when video evidence will be virtually useless.

The Dolphins are amazing. I didn't know they could produce bubble rings, and I didn't know anyone (or anything) could "snap" them apart into smaller rings without disrupting them. The Dolphins are clearly skilled at manipulating fluid currents.
Robert Gentel
 
  1  
Reply Wed 1 Oct, 2008 02:32 pm
@rosborne979,
Well you made me curious, that's a kind of thing that would be easy to fake.
rosborne979
 
  1  
Reply Wed 1 Oct, 2008 02:41 pm
@Robert Gentel,
Quote:
Well you made me curious, that's a kind of thing that would be easy to fake.

Skepticism is good. Smile

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