Cavitation break up of ... snails ???? 1

[BigInch]

This is an interesting video about how a manta shrimp opens up snails for feeding. It gives them an over 200 lb force whack with a claw. Not bad strength for a tiny little shrimp eh? While measuring the force belted out by the shrimp, two impacts were observed. The second approximately equalling the same incredible force of the original blow. What was responsible for the second impact?
20,000 frames per second reveals that cavitation damage is apparently being employed by the shrimp in obtaining its meal.

This is a bit long (11 m 30 s) getting to the conclusion, but worth the effort, if you're interested in the damage mechanics of cavitation.

http://www.ted.com/index.php/talks/view/id/77

Do we need self-molting impellers?

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[BigInch]

Of additional interest here may be how in the hell they get 20,000 frames/sec. Wouldn't mind seeing that equipment.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[BillBirch]

I can't believe I sat through that! Mind you, she does have an entertaining lecture style.
Regards,
Bill

P.S How do you stumble on these sites?

 

[BigInch]

That's why I warned you.

She does manage to connect with her audience quite well.

Ya. Regular TV in Spain is total crap.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[KiwiMace]

I actually went back and watched this, somewhat surprising myself.

It was pretty interesting to *see* the formation and the collapse of the bubble and I totally didn't know that light was given off. It was drama trying to get a data card for 1 kHz several years back, hard to believe 'they' can capture low light video at 20000 frames/sec.

 

[BigInch]

Must be some kind of big disk spinning at 120,000 rpm. Was it light, or the aberration/refraction of the low light striking the vapor contained inside the bubble, that appeared as a light emmission? I'm not sure that was clear.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[btrueblood]

Haven't watched the video, but see

http://en.wikipedia.org/wiki/Sonoluminence

 

[BigInch]

There you have it. Cool.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[dcasto]

wow, now I'll sit in awe for a second or two before I eat my next shrimp!

 

[BigInch]

LOL Ya I'm poking them to make sure they're really dead before I put them in my mouth now.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[KiwiMace]

According to the wiki site, the temperature inside the bubbles is 20,000K - is mankind on the verge of a self-grilling seafood dinner where the light blinks when it's done.

 

[pmover]

ok,

to read about how high speed video/photography is conducted, you may read this article.

http://www.americanheritage.com/articles/magazine/it/1997/

This magazine is my favorite magazine! Enjoy!
-pmover

 

[ozmosis]

..and all because Spanish TV is crap..now that is amazing!

 

[BigInch]

A blessing in disguise, heh? Its mostly soaps imported from Venezuela & Colombia. Total rubbish, but still better than native Spanish TV. They actually had one show last year where the only set was in front of the office coffee machine (filmed with a fish-eye behind a transparent front panel of the machine). Different workers would show up, get coffee and gossip with the others standing around about their office collegues that wern't getting coffee at the time. UGH!

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[25362]

Take a look at supercavitation wikipedia to see what is being done with this type of phenomenon.

 

[pumpking]

Check that those shrimps arent wired to the plate before you try to eat them !!

Ash Fenn

http://www.cdrpumps.co.uk