This is a second video, made public a few hours later, which just details the demo apparatus... If it appears in your feed AND you have already watched it, that is because you are good and loyal Sixty Symbols viewer who clicked the links on the main video. MAIN VIDEO: kzread.info/dash/bejne/o5uVz8ioaJmsgdI.html

@AngryLizard0

7 жыл бұрын

What would the instability look like if there were three fluids? one traveling up, one traveling down and the third being stationary. Would the instability take effect on both sides, like a mirror?

@a006delta

7 жыл бұрын

The_Blu_Nova I think so too. Mainly because fluids just need to move *relativly* to eachother.

@Majromax

7 жыл бұрын

It depends on the layer thicknesses and relative densities. If the layers are very thick, it will look a lot like two separate sets of instabilities that may or may not be in-phase. If the layers are very thin, then it will be easier for the layers to 'roll up' together. This is then modified by the relative densities. One thing not mentioned in the main Sixty Symbols video is that when the fluids have different densities (like fresh and salt water), the force of gravity acts to stabilize things -- the heavy fluid that gets pulled up by the pressure has to fight against gravity to get there. If the three layers have very different relative densities, it might be possible for the Kelvin-Helmholtz billows to grow at just one of the interfaces.

@NoActuallyGo-KCUF-Yourself

Жыл бұрын

I watch all the Sixty Symbols vids, but this one doesn't show up until 5 years later?!

The delay between tipping the container and the instability showing up is awesome. You can really see it's a self-amplifying effect. I thought you had paused the video at first.

@Hippo_Heli

7 жыл бұрын

Wouldn't it be easier to use oil and water?

@valeriobertoncello1809

7 жыл бұрын

SPKY 13 Interesting question... I think the answer could be the need for two liquids of different densities but same viscosity.

@vishnuprasadps2243

7 жыл бұрын

Water and kerosene? Approximately the same viscosity, if my observation (at home, so maybe wrong) is not wrong. Also, saves the trouble of colouring the liquid!

@Les537

7 жыл бұрын

Pah, water. You could simplify this set up even more with some dynamite and plutonium.

@deantoth

2 жыл бұрын

@@Hippo_Heli no, because once you are finished you then have gallons and gallons of oil that you have to dispose of. Rather than some vegetable colored water. Multiply this by how many students run the experiment during a lab.

At 4:33 it looks like each wave gets it's own instability waves on top, so the whole setup quickly becomes a fractal for a second or two until the turbulence fully kicks in and mixes it all up. Amazing setup! Well done and thumbs up for dr Turnbull!

@LordBax

7 жыл бұрын

Yes! I thought this was the most amazing part. I wonder if the students are using fractal mathematics to describe this.

LOL the music is awesome!

Fascinating how quickly and uniformly they pop up.

I love how this experiment is capable of being done in a primary school environment. A 3rd-4th grade teacher can easily (well, it does require some prep) do this, and it's less messy than the infamous volcano.

Wow... what a cool experiment. Thank you for taking the time to make this and share with everyone :) There look to be more going on in this, I'd love an explanation on the lag before the hooks form.

At 3:39, we see the first instability occurring but within a couple of seconds we can observe a second instability occurring on top of the first "seahorse-head" for a fraction of a second as the process repeats itself. Absolutely beautiful. Correct me if I am wrong.

So beautiful. Thanks for the hard work you are putting into that. And of course to the people doing those experiments!

Great music, Alan.

You can see little horse heads on top of the big horsehead just before they become too mixed to wave anymore. Is Mandelbrodt inside the Kelvin-Helmholtz?

@valeriobertoncello1809

7 жыл бұрын

I noticed that too!

@zenodorous

7 жыл бұрын

itsathought2 There is definitely some kind of fractal-ness to it!

Fluid dynamics come front stage. Awesome!

at 3:41 it looks like you can actually see some second order instabilities on the boundary of the first vortex like instability! Neat

Thanks for helping me understand how clouds and air pressures work just a bit.

Great video and experiment, Brady and the team!

@sixtysymbols

7 жыл бұрын

+Rasmus thank you

@dermotmclaughlin9960

6 жыл бұрын

If the dimensions and angle of tilt of the apparatus were changed and optimised for visual effect could this experiment be designed with chemicals which would naturally separate afterwards or is mixing an inherent property of Kelvin-Heimholtz waves

I'm feeling nostalgic because this was an important concept for my undergrad research!

This is so simple but so gracious and fascinating. Damn Physic is cool.

This was a thing of such indescribable beauty

after the third camera angel i was like and where is the slow motion? wasn't disappointed

This kind of reminds me of the bands Jupiter, how they mix and swirl where they contact each other. That's pretty cool.

You've just created a perfect visual analogy for the zero dimension! ;O)- Unlike our own dimension, the trans-dimension has little to no pressure (do it's extension from Real Time,) so when quantum frequencies glide across in zero (neutral time/space) dimension they cause a multitude of various reactions (which we call _particle waves_.) - of course science hasn't caught up to this synopsis but I'm hopeful we are just around the corner as we dive deeper into gravity waves. - Corvaire ;O)-

Maby a silly question, would the effect work with the same set up but with oil and water? might result in an experiment you could repeat a little easier.

@LeoWattenberg

7 жыл бұрын

it even works with air and water, that's why we have ocean waves :) But if you use vastly different densities (freshwater is 1.00g/cm³, the saltwater here is 1.01g/cm³, sunflower oil is 0.92 g/cm³ - that's 8 times as much of a difference), the effect becomes less clear. Again, this is the reason why ocean waves look like they look instead of something more Kelvin-Heimholtz-y.

@planetsoccer99

7 жыл бұрын

Why does it become less apparent? You'd think a greater dp/dz would give a higher BV frequency, no?

@LeoWattenberg

7 жыл бұрын

Since the density here is so close, you get almost symmetrical patterns, which is what makes this so beautiful and special in a way. If you use very different densities, the symmetry goes away and it also becomes chaotic much more quickly _[citation needed]_.

@xja85mac

7 жыл бұрын

It seems a silly question at first, but now I want to see it. Too bad I don't have a plexiglas tube to do it myself...

@chillbro1010

7 жыл бұрын

The larger the difference of densities, the harder it is for the less dense material to affect the other one. If you notice in this video, the denser salt water (blue) flips upwards into the other material. Like how water is too heavy to form the full horse head/hook structure in air, using water and oil, the difference is so big that the water would not be able to flip up and create the full hook structure. Meaning you would need to do this experiment in space to get the oil/water system to make effects this large, even though its repeatable its much more expensive.

Lovely footage for HI!!!

Got to love that permanganate staining. Always wear gloves or only use a very dilute amount. It's not that toxic but you get left with purple hands for a long time.

A close-up of tank two would make a great desktop background.

I would like to hear more about the nature of the vorticity of the Hemholtz cinnanan roll and how it shifts in a predictable mode (like the processing of a gyroscope about an axis.

2nd law of thermodynamics visualized. Beautiful effect!

So much prep work for such a quick experiment. Fantastic imagery though!

Mmm, satisfying laminar to turbulent transition. I remember playing with those toys in my hydraulics class.

I remember seeing a demo before with a spinning acrylic sphere filled with what must have been many layers of blue liquids of different densities and polarities (e.g. oil and water). At first I didn't get the point of it, but I think I do now: we were supposed to spin it (and maybe even stop it) so the layers of liquids would move pass each other to create this effect.

Is there a repeatable version for the mixtures? I guess It works so beautifully because of the very similar densities of salt water and fresh water. And a oil/water mixture or something like that just has a much too big density gradient to observe it.

What happens if you change the tank's dimensions? a) Keep the tank the same height and double or half the width? b) Keep the tank width the same and half or double the height? c) Try longer/shorter tanks? What happens as you gradually increase the density difference between fluids?

It looks like the clouds patterns of Jupiter!

@yaoooy

5 жыл бұрын

the same phenomenon occurres in Jupiter

Love the soundtrack to this video. Where can I get a copy of the soundtrack?

Any videos coming up featuring Prof Phil Moriarty? Love his videos

The music is fantastic! I've looked through Alan Stewarts stuff however, and I can't find the exact song. Anyone know it?

@deantoth

2 жыл бұрын

Agree. Same question.

What determines the size of the waves? Can the size be reliably controlled by controlling the densities of the liquids, certain dimensions of the container or other parameters?

This is cool. I'd like to see the experiment repeated with two insoluble liquids, in hopes to better see the vortices without the colours mixing.

niceeeeee!!!

It is interesting when it goes from laminar to turbulent and how much better it mixes when turbulent.

Groovy.

So how long did it take to get set up from adding the salt water to ready to go?

I assume the frequency/spacing of the wave shapes is based on the ratio and speed of the different liquids or gases?

"Look how impressed these guys are." Exactly.

I wonder what does this effect look like when viewed from above?

very cool, you can see the moment in which the whole thing becomes turbulent.

Does anyone have a clue, what factor contribute to the wavelength of the vortexes. My guesses are the speed difference between the to layers and maybe the (average) density of the fluids.

@bobcargill4506

6 жыл бұрын

The wavelength does appear to be similar for the two demonstrations. Perhaps related to the speed of sound in the media and a standing wave in the two flows? Interesting question.

Awesome track! What's that song?

I'm intrested to buid one of these to my Fludic Mechanics students. Is there any link of this project with some of the design considerations ?

I wonder what they look like from the top? The tallest part of the 'wave' appears to be pressed against the far side of the glass. Are they making sequential small whirlpools?

Could anybody tell me how's this applied/taken into account in engineering projects?

What is the wavelength of those bumps? It looks like a wave from the water hitting the bottom end of the pipe propagates upwards and gets amplified. If they went back and measured the length of that clamp it could be compared with the wave in the video to get the wavelength.

4:36 it looks like there's another layer of this effect on top of the biggest waves, i guess this pattern repeats itself in different scales which eventualy causes the perturbations and collaps to a complete mess. am i rite?

I understand why the disturbance are magnified. But why the disturbance seems occur in an almost equal distance distribution? One explanation maybe the disturbance is caused by some sort of small standing wave.

Would the same effect happen with oil and water?

Does anyone else see the mini-hooks on the greater hooks at 4:40 ?

Why not use something that isn't miscible with water (mineral oil maybe?) to remove the issue of the layers mixing?

Heimholtz Resonator, bass port in speakers, same fella right? Fluid dynamics?

Why is it happening everywhere (along the interface) at the same time?

On what principal it works ???

Needs some fine glitter mixed in both liquids so that local movement can be more readily followed on the slow footage...

0:28 half full / empty?? It depends on whether u are filling or emptying! Try it out for yourself. : )

How much cost will be for this apparatus

What's the reason for the delay?

ok tbf we fluid dynamicists can be a bit blase about these basic fluid dynamic instabilities, but they really are very beautiful

who is the older guy walking in? looks like Ferenc Csagoly

Why not use something like Oil and Water that will mix then separate again afterward so you can repeat the experiment after allowing it to settle out?

@mho22

7 жыл бұрын

I think the density difference between oil and water is to huge. But I am quite sure it would work with a polar/unpolar setup, you just need to find or make them with small density differences.

@dragoncurveenthusiast

7 жыл бұрын

It also works with air and water (ocean waves), and oil is definitely denser than air, so I'd speculate that it would work. but maybe the effect is not that nice (for some reason I can't think of) or there are some practical disadvantages like cleaning the tube from salt vs oil residues

@deantoth

2 жыл бұрын

Because storing a 200 pound oil filled tube all year only to haul it out once or twice for this experiment is far more trouble than just filling it with simple disposable, safe cheap water.

how long did it take

Would it be possible to do the experiment with more than two liquids?

@valeriobertoncello1809

7 жыл бұрын

I'd assume it would!

@JM-us3fr

7 жыл бұрын

Now now children, let's not break the universe

@ekarademir

7 жыл бұрын

That's what's happening in Jupiter.

This is my lab! I work here!! :)

@amidhmi5243

7 жыл бұрын

In pounds Sterling... Monthly...

Probably some micro organisms in there that got the best waves of their lives

wow. glad i smoked one before watching this.

KZread! Why you no tell me about sixty symbols videos!

@sixtysymbols

7 жыл бұрын

This one is still unlisted - I make it live a bit after the main video so that most people don't see it BEFORE the video that is supposed to come before, but I make it watchable so people don't have to wait....

@damienw4958

7 жыл бұрын

Sixty Symbols ok thanks!

@ArneSchmitz

7 жыл бұрын

Sixty Symbols i watched it before. Saw it on twitter first.

Why don't you use oil and water so it can be done more than ones?

@deantoth

2 жыл бұрын

Because dealing with gallons and gallons and gallons of oil in a giant 100 pound tube of liquid is a huge amount of hassle. Disposal, leaks, storage. And anyway the educational value of setting up the experiment is also worth something. Just walking up to a tube that's already filled and just tipping it is far less educational.

Use a white backdrop next time

Who half-fills a container from empty and then describes it as half-empty?

@NoActuallyGo-KCUF-Yourself

Жыл бұрын

Exactly! Half-empty vs half-full is about direction of flow rate.

I'm missing that sexy Sixty Symbols watermark.

This same process applied to geology has proved the theories wrong that mud and clay settle very slowly over time in water environments. The Kelvin-Helmholtz turbulence in fast moving waters such as floods when encountering a different layer such as cleaner water, produces fast sediment sorting into different fine-to coarse particles and rapidly increases deposition. Now it is known that vast mudstone and siltstone layers of significant depth can form quickly and with fine layered sorting during catastrophic flooding.

is this related to turbulence?

@valeriobertoncello1809

7 жыл бұрын

Is math related to science? - Katy Perry 2017

@seanehle8323

7 жыл бұрын

Turbulent flow is mixing flow, which you can easily identify in this video once you know what to look for. The parts where the liquid stays its original color are experiencing laminar flow (non-mixing flow). The parts where the color changes to a new, perviously not-present color is where the mixing flow (turbulent flow) is happening.

Human music? I like it.

@backwashjoe7864

3 ай бұрын

I get that reference!

Next time put a white sheet behind it!

you only had one job : putting a white screen behind it so we can watch the experiment correctly. :)

the background music sounds like runescape

"...pumping the tanks half (...) empty (...) with fresh water" - hmm... ;-)

the horse heads have mini horse heads

Why didn't you tell people why it happened rather than just that it in fact did?

Sixty Symbols can you ask your scientists whether or not they believe in free will?

would've been 10x better if you had just taken the time to put up a white background.

@Puleczech

6 жыл бұрын

Exactly. Sometimes these things seem just too lazy. Don't get me wrong, I love it, but put 15 more minutes of effort and it will come out waaay better.

@JohnnyMotel99

6 жыл бұрын

or a black background with strategic lighting, at least for the two colour version.

@AttilaAsztalos

6 жыл бұрын

Probably blew all the budget on salt and colorants... :P

If we can watch this on earth, why did we send a probe to Jupiter? 😉

Its no wonder we are pattern seeking mammals.

9/11 floors all gave out at once.. what ever resistances was left wish what we saw on tv