Droplets levitate on a bath of liquid nitrogen and are spontaneously self-propelled. Thanks Audible! Start a 30-day trial and your first audiobook is free. Go to https://audible.com/VERITASIUM or text VERITASIUM to 500500.
Special thanks to Dr. Anaïs Gauthier
Physics of Fluids: https://pof.tnw.utwente.nl/
Self-propulsion of inverse Leidenfrost drops on a cryogenic bath
Anaïs Gauthier, Christian Diddens, Rémi Proville, Detlef Lohse, and Devaraj van der Meer
PNAS January 22, 2019 116 (4) 1174-1179; published ahead of print January 22, 2019
https://www.pnas.org/content/116/4/1174
For a detailed description of the setup:
http://www.lps.ens.fr/~adda/papiers/Langmuir2016.pdf
And self-propulsion is also seen: http://www.lps.ens.fr/~adda/papiers/InvLeidenfrost.avi
Other recent (hot) Leidenfrost experiments that might be interesting:
* Leidenfrost wheels: https://www.youtube.com/watch?v=glRGl-eYuXo
* Leidenfrost maze: https://www.youtube.com/watch?time_continue=174&v=vPZ7sx3EwUY
* Leidenfrost explosions: https://www.youtube.com/watch?v=z0sp3AjgUy4
Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd
Thanks to Prof. Kevin McKeegan at UCLA for the liquid nitrogen
Filming by Raquel Nuno
Additional animations by Alan Chamberlain
source
English needs a few more words. Reverse and inverse are both not quite inappropriate for this effect.
And the best thing about audible is you can even hear your audiobook and then give it back ^^. It works about 30 times before you can't do it, but then you can just go to a support live chat and ask them if they can give some books back for you and they just do it. So I basically use it as a library for $10 a month. It's very nice!!
"…why would there be a wave?" It seems obvious if you understand how sound travels… But…
Because the vapor that is the inverse effect breaks the surface tension when you drop it in. Effectively the mass of the oil pushes the vapor to create the ripple in the nitrogen.
It's like a self fulfilling prophecy…
I would hypothesize that the drop is being propelled by the Magnus-effect. The initial imbalance causes a motion in one specific direction ( over the alternative vector ), and the evaporating liquid nitrogen vapor moving differentially quickly over the 'front' side of the droplet ( the side facing its forward motion vector ) produces lift in that direction. I'm hypothesizing that its 'forward' motion is due to the Magnus effect instead of the Bernoulli effect because I would expect the oil droplet to have some form of angular momentum upon forming, and this angular momentum likely causes the droplet's initial direction of travel, and initializes the Magnus effect due to its initial spin. All just a guess, but one I'd bet some cookies on….
5:10 Shinra tensei.
And now, because of you, i will click every title that doesn't make any sense to me 😉
this one could use a new title ( levitating droplets on vaporwaves)
The application example on cryogenics inspired thoughts of seeding life on very distant systems.
That scientist lady in the beginning is my dream woman
Now i know what i'm gonna call my next german-goth-doom-prog-metal band.
"You've probably heard of the Leidenfrost Effect."
Well… yes, I have… but I don't think this is common knowledge.
Is the droplet itself static? or is the droplet rotating as its moving?
what is not great about it is that you always say what is great about it
Twente university ftw! =)
Now this video needs a more click-baity title!
Can this vid also get a thumbnail-title-packaging change?
Like me, when she speaks English, she sounds more French than when she is actually speaking French 🙂
imagine, in 150 years from now, were traveling from point A to point B in a silicone bubble
Did not expect to see my hometown university here
What's the application for this?
You can make bomb ass videos
Two things, first of all change the name since this video has only a little more than a third of another video that incorporates the Leidenfrost effect and is only a year older (with less subscribers). The second thing, more importantly, would this demonstration work in a vacuum and could this effect also happen in the absence of gravity?
This seems extremly useful for exploring Titan
Someone should make this into an analog game of pong.
Thats all very interesting, but another even more interesting phenomenon is seen when, during heavy rain; splash droplets are seen to ride upon the surface of a puddle instead of being subsumed. the smallest ones can remain floating for quite a while. this requires fairly pure, cold water: I assume it is beacuse the surface tension of the water surfaces has bound up almost all the loose surface charges, or perhaps it's a clue to the molecular structure of the surfaces, which seem to not mesh readily. It is not an uncommon phenomonon, but I would love to see it investigated.
5:02
Amazing
What is the name of the scientist?
Crushing hard on the blond lady physicist with the glasses and the accent
Maybe we need places like Veritasium and other science folks on YouTube to do the replication studies that are really essential to advance scientific discoveries, but aren't often funded or published in the Science journals.