Crazy! Anyone seen this before?
"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."
[YT]http://www.youtube.com/watch?v=bT-fctr32pE[/YT]
not sure why the youtube tags never work for me. here's the link
http://www.youtube.com/watch?v=bT-fctr32pE
"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."
[YT]http://www.youtube.com/watch?v=bT-fctr32pE[/YT]
not sure why the youtube tags never work for me. here's the link
http://www.youtube.com/watch?v=bT-fctr32pE
