Faraday Instability in Floating Drops
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- Опубликовано: 24 ноя 2014
- 2014 APS/DFD Milton van Dyke Award Winner
In 1831, Michael Faraday discovered that a liquid undergoing vertical vibration is unstable to surface waves. We show the Faraday instability in floating liquid drops, as an example of hydrodynamic instability that develops in a domain with flexible boundaries. A surprising mutual adaptation between the waves and the drop's boundary occurs, as a result of the competition between the wave radiation pressure and the capillary response of the drop's border. Two types of behaviour are observed. In the first, stable drop shapes are obtained experimentally and they result from the equilibrium between wave radiation pressure and capillary pressure. In the second, the radiation pressure exceeds the capillary response of the drop's border and leads to non-equilibrium behaviours, with breaking into smaller drops that have a complex dynamics including spontaneous propagation.
Authors
Giuseppe Pucci, Matière et Systèmes Complexes, Université Paris Diderot
Martine Ben Amar, Laboratoire de Physique Statistique, Ecole Normale Supérieure
Yves Couder, Matière et Systèmes Complexes, Université Paris Diderot
dx.doi.org/10.1103/APS.DFD.201...
See more videos in the 2014 APS/DFD Gallery of Fluid Motion gfm.aps.org/meetings/dfd-2014/ 
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I guess some commentators here will never wrap their minds around the fact that the processes in this small droplet are the same as some of those that govern many complex systems evolution, from living cell formation to the things that happen in cosmic nebulae.
What is the source of the vibration?
@@yourkingdomcomeyourwillbedone More than likely the hum that comes from Hydrothermal vents. The sound from the has been shown to readily form Faraday waves. Once life is started if you have noticed many creatures have heart beats as one vibration, breathing as one, Electrical impulses as another etc....etc.... The sources are roughly endless. Movement alone creates its own vibrations and resonance with the particles own created waves has been shown to create stable systems as per maths of Pilot wave theory. Check out John WM Bush for recent research in the area. Well worth it.
@@yourkingdomcomeyourwillbedone What indeed. This is amazing.
Fascinating! ^.^
I couldn't help but think about the similarity to strings in string theory, you can see closed on open ones as well as ones bound together. It's a strange coincidence considering that the pilot wave bubbles also display some weird behavior.
is it scalable into nano-scale ?
in 1:55 There is a diagram. I am a high school student working on the same problem, would someone be so kind and explain the Y axis to me?
At 1:15 I see a graph with gamma over g on the y-axis.
I think the gamma over g (gravitational acceleration due to earth?) relates to the "capillary response of the drop's border" while the f_0(Hz) relates to the "wave radiation pressure".
I'm still looking for the original article to try to get a better understanding.
"A surprising mutual adaptation between the waves and the drop's boundary occurs, as a result of the competition between the wave radiation pressure and the capillary response of the drop's border. Two types of behaviour are observed. In the first, stable drop shapes are obtained experimentally and they result from the equilibrium between wave radiation pressure and capillary pressure."
I think gamma\g is forcing amplitude
hallelujah praise the lord almighty!
Oumuamua
This is fascinating. I swear the human race could do so much in this time if we fucking stop worrying about the oil, money, and what that dude caitlyn jenner is wearing.
Caitlyn Jenner is not a dude. I'm not a fan of her personally, but basic mutual respect is one thing required for the human race to go so much farther, as you say you want. For shame.
Send this video to anyone who claims to disbelieve evolution because "random processes can't produce new information!" I'd say those complex shapes at the end of the video, all starting from a single round blob, is an example of how complexity can arise from purely natural processes, as long as there is a source of energy. In your face, creationists!
YOUR ALIVE!
This is so beyond them that they would just dismiss it as Witch Craft,
Why the hell you evolutionists see everything scientific as "In your face, creationists!"?.Can't you just shut up and admire the beauty of nature without whine against people that believe in god?Or you must be the "Light of reason" all the time,the knight of the enlightenment against the religious,obscurantist feelings.Oh wait! Isn't that feeling of being the "knight of enlightenment",well,a feeling too?Are you against the obscurantists that created the basis of all the science?Or do you seriously think that science was born in the 1800s?
BTW,as I said,can't you just stop whining and admire silently the beauty of nature,without worryng if it was random or programmed by god to do so?
@@Bronze_Age_Sea_Person About Kaguya from Naruto.
Japan loves kaguya, Because Kaguya is based on Princess Kaguya(a princess from the moon an alien). a 10th-century japanese folklore. (search google)
so your word won't reach Japan.
Japan likes Kaguya otsutsuki as a final villain because her mythology, her history is legend.
and what will you do if kaguya returns in Boruto?
Is it inconceivable that there is a process like this that created a life-form unlike ourselves in scale and complexity first? This is not mutually exclusive to the existence of a 'higher power'.
Jesus Christ. Go spend your money on some real research. Or even if this has some purpose to it, don't blow its meaning way out of proportion....
You are just ignorant.