Two Vortex Rings Colliding in SLOW MOTION - Smarter Every Day 195

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2018Jun 20

This took 4 years to recreate. 12 Hour edit here: • Behind the Scenes: Two Vortex Rings Collid... Please subscribe if this video earned it: http://bit.ly/Subscribe2SED Get a free audio book! http://www.audible.com/Smarter ⇊ Click below for more links! ⇊ High Resolution images will be provided to the Patrons of Smarter Every Day at: / high-quality-19568610 / smartereveryday If you’d like to support big adventures like this, consider becomingbeing a Patron! 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. • Behind the Scenes: Two Vortex Rings Collid... People don't tweet me their thoughts about videos enough. I'd love to hear from you. / smartereveryday Smarter Every Day on Facebook / smartereveryday Smarter Every Day on Patreon / smartereveryday Smarter Every Day On Instagram / smartereveryday Smarter Every Day SubReddit / smartereveryday 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/5Itp2w... All A Shell in the Pit music available at: https://ashellinthepit.bandcamp.com/t... http://ashellinthepit.bandcamp.com/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION A Vortex Ring is also called a Toroidal Vortex https://en.wikipedia.org/wiki/Vortex_... 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/co... Numerical Analysis of this phenomena http://fluid.itcmp.pwr.wroc.pl/~znmp/... Interesting Research Papers on Vortex Ring Reconnection https://pdfs.semanticscholar.org/3721... Other Videos created by Dr. T T Lim http://me.nus.edu.sg/dept/limtt/video... Flow Visualization, A Book by Dr. T T Lim https://www.amazon.com/Flow-Visualiza... Why we typically don’t talk about angular momentum in fluids. https://physics.stackexchange.com/que... 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET STUFF SECTION: (If I did this right these should be working Amazon affiliate links to purchase the stuff I like to use. When people purchase from these links it will support Smarter Every Day.) ❓Mystery Item (just for fun): https://amzn.to/2KOep01 📷Camera I use : https://amzn.to/2VSiruw Favorite Lens: https://amzn.to/2KPDQ1a Lav Mic: https://amzn.to/3aRek6r My Tripod: https://amzn.to/2Yl6RtJ My Multi-tool: https://amzn.to/2zGm5Pz 💾How I get footage off my phone: https://amzn.to/2KMem4K Travel Tripod: https://amzn.to/2zEa9Oi Favorite Bidet: https://amzn.to/2xnMG3b 🥽Goggle Up! : https://amzn.to/2zG754g https://www.smartereveryday.com/store ~~~~~~~~~~~~~~~~~~~~~~~~~~ If you appreciate what you've learned in this video feel free to pitch a few dollars Smarter Every Day by becoming a Patron. / smartereveryday #smartereveryday #vortex #fluiddynamics