Two Vortex Rings Colliding in SLOW MOTION - Smarter Every Day 195
Added 2018-06-20 16:58:24 +0000 UTCThis took 4 years to recreate. 12 Hour edit here: https://youtu.be/Cm9l8-qngjM
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I’ve been chasing this problem for over 4 years. The 12 hour edit chronicles the entire process after David Linderman and myself started working on it in earnest.
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Song “Rings in Rings in Rings” by Gordon McGladdery of A Shell In The Pit
Listen to it on Spotify: (It helps
https://open.spotify.com/track/5Itp2wFFmI6xtIAc54F1rM
All A Shell in the Pit music available at:
https://ashellinthepit.bandcamp.com/track/rings-in-rings-in-rings
http://ashellinthepit.bandcamp.com/
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GET SMARTER SECTION
A Vortex Ring is also called a Toroidal Vortex
https://en.wikipedia.org/wiki/Vortex_ring
Original Research Paper by T. T. Lim & T. B. Nickels (Published in Nature 1992)
http://202.118.74.190/~elizabeth/Docs/34_Instability_Head-on%20collision_of_large_VR.pdf
Governing Equations of Fluid Mechanics
http://www.eng.auburn.edu/~tplacek/courses/fluidsreview-1.pdf
Numerical Analysis of this phenomena
http://fluid.itcmp.pwr.wroc.pl/~znmp/Publikacje/JP_2014_Kudela_Kosior.pdf
Interesting Research Papers on Vortex Ring Reconnection
https://pdfs.semanticscholar.org/3721/e67f5bf8e88a47e2241058c7e3cc064c5e8a.pdf
Other Videos created by Dr. T T Lim
http://me.nus.edu.sg/dept/limtt/videogallery.html
Flow Visualization, A Book by Dr. T T Lim
Why we typically don’t talk about angular momentum in fluids.
We used a computer controlled cylinder to pump fluid behind a rubber membrane to fire toroidal vortices out of the vortex cannons.
We fixed one of the vortex cannon in a stationary position, and used a multi-axis microscope stage to align a second cannon to it… which sounds incredibly easy, until you realize that
DYE density was an experiment all on its own.
If the density of the dye mix was light than water, the vortex would go up.
If the dye was more dense than water the vortex would fall.
We had to overcome SO MANY VARIABLES to overcome and we basically spent about 4 hours figuring each variable.
Water/dye temperature differential
Water turbulence
Water turbidity (cloudiness or haziness of a fluid)
How to reset the aquarium
Cannon Spacing
Cannon Nozzle
Cannon Shape
Dye homogeneity in the vortex itself
The piston displacement volume
The piston stroke speed
Rubber diaphragm tension, would make one side fire faster than the other.
Water or air to drive diaphram?
Firing speed (too slow and they drift, too fast and turbulence tears apart secondaries)
We did a complete redesign of the cannon 3 different times.
The Dye loading method was changed several times
At times We tried to maintain negative pressure on the cannon chamber… we also tried to put shutters on the front of the muzzle. Ultimately I decided it was ok to live with dye dripping out of the front.
We had to premix the dyes and eventually we got there.
It got to the point where we didn’t even really know what success looked like and always thought we were there.
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The thought is my efforts making videos will help educate the world as a whole, and one day generate enough revenue to pay for my kids college education. Until then if you appreciate what you've learned in this video and the effort that went in to it, please SHARE THE VIDEO!
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Warm Regards,
Destin
Comments
Where can I get the high resolution pictures?
Alex Civitello
2020-09-06 18:46:10 +0000 UTCThis video, the insane effort and grit you demonstrate in pursing these things and the uplifting connection you make at the end are what make this channel amazing. I’m increasing my contribution because this was above and beyond and you then turned that into a message that has the potential to ripple that out across everyone who watches that video
Team Saunders
2020-08-16 14:06:49 +0000 UTCHave you seen this recently published article in Science Advances, which is entitled "Turbulence generation through an iterative cascade of the elliptical instability"? https://advances.sciencemag.org/content/6/9/eaaz2717
Daniel Turner
2020-03-06 12:45:54 +0000 UTCLove to see...specially because i work a lot with inks....and movement of ink...
2018-07-12 15:23:37 +0000 UTCDestin, I admire your tenacity. Your video turned out to be a great "dadding" moment. My daughter was enjoying looking at the equipment and asking questions. Then she fell in love with the collision. Your comments afterwards about not giving up allowed me to segue into a conversation about pushing through any hiccups or failures to get your goal. Thank you for that!
2018-07-02 16:38:55 +0000 UTCfor the collisions like at 5:35:15, i cant help but think of members colliding proposed by string theory. Maybe totally unrelated but I could of swore hearing and watching about a theory of how our universe was created, from collision of two membranes.
Steve Govea
2018-06-28 17:47:45 +0000 UTCThanks man!
Smarter Every Day
2018-06-24 23:00:11 +0000 UTCI love how you take this incredibly complex problem and turn it back around to the viewers to encourage the tackling of problems. Keep spreading life, Destin!
2018-06-22 13:27:39 +0000 UTCDoc Edgerton would be very, very proud of you. Your approach and attitude is totally “Strobe Lab”. Well d
2018-06-21 13:14:06 +0000 UTCThey did good. I hope I didn't offend him!
Smarter Every Day
2018-06-21 06:40:10 +0000 UTCIt might have been all the links, but gmail filtered this email into my spam folder automatically instead of my inbox.
Russell Uresti
2018-06-21 05:26:00 +0000 UTCPictures are Awesome!! Way to stick it out man!
2018-06-21 02:44:03 +0000 UTCHave you ever seen "Outside In"? Some of the transitions after collision look familiar, which makes some sense given the rough similarities between the vortex collisions and sphere eversion. <a href="https://en.wikipedia.org/wiki/Sphere_eversion" rel="nofollow noopener" target="_blank">https://en.wikipedia.org/wiki/Sphere_eversion</a> <a href="http://www.geom.uiuc.edu/docs/outreach/oi" rel="nofollow noopener" target="_blank">http://www.geom.uiuc.edu/docs/outreach/oi</a> <a href="https://youtu.be/wO61D9x6lNY" rel="nofollow noopener" target="_blank">https://youtu.be/wO61D9x6lNY</a>
Randy Thomson
2018-06-21 02:21:34 +0000 UTCFreaking amazing video! You are the best!
2018-06-21 01:04:48 +0000 UTCDude, you’re amazing. Thank you for your persistence and thank you for sharing your efforts with us all!
Jason Williamson
2018-06-21 00:54:11 +0000 UTCDid you attempt to locate T.T. Lim or T.B. Nickels? Considering they were using a "potatp", they got some very clear shots of the mini-vortices.
Kristy
2018-06-20 22:46:02 +0000 UTCI am unabashedly in awe.
2018-06-20 20:00:56 +0000 UTCGreat video Destin! I love your passion for learning, it's very inspiring. I've just finished my degree in Astrophysics!
2018-06-20 19:59:48 +0000 UTCWell if you increase the viscosity much it becomes a whole lot harder to get everything aligned to get such good shots. Also I hypothesize that at a certain lower viscosity, the viscous forces will dominate the instability that forms in the outer rings so it will not form the smaller vortices.
2018-06-20 19:43:10 +0000 UTCThis is amazing... So what happens when you change the viscosity? Also, I think you highlighted a great lesson about persistance, but I also think a lot of young scientists and engineers would love to hear (or need to hear) about breaking things down into managable steps and managing multiple projects.
Charles Bosse
2018-06-20 19:32:49 +0000 UTCThis is so cool, Destin. I've seen the clip of the original experiment a few times over the last few years and I never even realised it was in water. I thought it was smoke rings colliding in air! I applaud your persistence and determination here - It absolutely paid off.
Stu
2018-06-20 19:19:07 +0000 UTCcan some one send me high res photos of vortex collision?
2018-06-20 18:47:36 +0000 UTCI've been on a 14 year quest to build a spherical motor to control how a spacecraft points (a "Reaction Sphere"). Just turned in the final paper for a 2 year program with NASA to try to get this to flight readiness but didn't quite get there. So this video of a 3 year struggle really hits home with me today. Thanks for being so inspiring!
Emory Stagmer(VAXHeadroom)
2018-06-20 17:58:32 +0000 UTC
