Twist in Time - Laminar Flow

[MyFladoodles]

i saw this on the science channel trivia question thing with carrie from mythbusters

[CrazyMustache37]

How many times can it work???

[amirali23]

Lol "Reynold's number is under 1". Reynolds number need to be under ~2300 to have laminar flow.

[OJulioIsidro]

What kind of black magic are they using here?

[DasBasdoInc]

@OJulioIsidro european

[ZENESTASCNE954321801]

I was guess look like a magic trick of science like this??? That's amazing.

[endimion17]

@jonaslover9971 Yeah, but in subtractive system. This is additive.

[TheAllBlackMan]

I saw this demonstration performed with glycerin. It was much clearer and the dots were stacked one on top of the other for a more dramatic effect.

[goolgaul]

@FinnishFuturist -- wow, one mention of the US flag and you're all flustered.

Him, Brainwashed? Maybe.

You, Moronic? Absolutely.

How did I know that from one comment? You somehow did.

[PennyDorkis]

Yay, a shout out to UNM and Prof. Cahill! I never took a class he taught unfortunately.

[707ruby]

what can i use instead of corn syrup? ANSWER, pls

[kevinfang2007]

very low Reynold number, the time derivative component might drop out in the NS equation, making things time reversible

[misternobodyunoe]

would anything other than corn syrup work? maybe a saturated sugar solution?

[jacquesdebauche3]

Use a long fine hypodermic syringe filled with a dyed liquid which is not miscible with the corn syrup and which has the same density (so that the droplets won't rise or fall). The needle is carefully held vertically on the midplane between the Couette cylinders, and a droplet squeezed out, the needle tip is moved and another droplet formed and so on to spell out letters or whatever. Stan Mason may have developed this demonstration. Does anyone have documented citations before 1957?

[jacquesdebauche3]

I first saw this demonstration in 1957 performed by Dr. Stan Mason of McGill University, only with the far more dramatic effect of having words spelled out with droplets of the dyed mineral oil suspended in the corn syrup - they smear, then reconstitute. The apparatus is called a Couette viscometer. Mason studied interactions between particles in shearing fluid - they behave rigid rules. The effect seen here depends on having a high-viscosity Newtonian fluid (corn syrup) and a low shear rate.

[Stevespanglerscience]

@jacquesdebauche3 that's an interesting idea having words spelled out! Do you have any information or know where I can learn more about his demonstration?

[rockinconcorde2]

@Stevespanglerscience thats so legit

[rockinconcorde2]

@Stevespanglerscience could i buy this off your website?

[Tecfan]

I hate the host.

[themobstermentalist]

Wow !

UNBELIEVABLE !

That is Hard to EXPLAIN !

Science want me to Brainstorm.... :)

[freddyen]

science

[furuilulz]

how many flags in the world aren't red white and blue? <,<

[gregshortall]

Hey Americans - that's called "science". Do you still have "science?"

[dorukanji2]

never done before on tv? we did this in the ninth grade when we were studying viscous fluids

[TylerFTW]

Can you say Back to the Future 4?!

[TheGracefulGhost]

Witch!

[shoegazer666]

Magic, got it.

[RandominatorTube]

Better call Saul

[wulyfs]

Isn't it really really pretty?

[jobriath85]

This is extremely nifty. I wonder how many turns you can make before undoing the cranks doesn't effectively unmix the liquids. It's always nice to see the universe giving you back something for free.

[chase42106]

The science guy seems to be kinda throwing fluid mechanics terms around.

[Dorkdufus]

it didn't work though

[baloneyjazz]

my model airplane leverages the same concept. Low reynolds number, low speeds, modest angle of incidence.

[solidkingcobra]

WITCHCRAFT!

[sean10222]

They just run the video backwards in the second half.

[Blacklemon67]

It's funny how they don't even explain it. They just say "wow" and "cool" and the demonstrator just says the technical terms without defining them :/ This is why I don't plan on getting cable when I leave my parents

[ehrichweiss]

It's actually NOT true that this has never been on TV before. This exact same type of demonstration was used on a Discovery Channel(or maybe it was TLC) show about wave/particle theory. That said, I always love seeing this experiment.

[rcropper]

omg time travel!

[jolte]

i'd like to see what it looks like from above. i don't think the colors really mix.

[ChrisMills90]

@jolte

It depends on your definition of mix. What happens is that as you spin the cylinder, it drags thin sheets of fluid around in a circle over and over again. Since the fluid is so viscous, these sheets don't "melt" into one mass very quickly, so you can return them to a smiliar state from when you started. If you're having trouble visualizing the sheets metaphor, thing about rolling up a piece of paper.

[bone009]

Time Travel.... we're close..

Anyways, this is really cool, to be able to travel back in time with a simple equipment, thats nice

[tinghaling]

What use has this t modern day life?

[soffitboy]

@tinghaling - Is something's "Use" the only measure of its value? I am sure that Tesla had no idea what "Use" electricity was going to be..

[Blacklemon67]

@tinghaling it's just a demonstration of fluid dynamics or more specifically laminar flow. The unmixing of dyes don't have any modern day significance but the concept behind it, masses of particles moving in the same direction, has applications in fields like aerodynamics and boat design.

[tonylahh]

i dont get how this is cool....

[pelky16]

it has been done on tv before liars daily planet did it first :(

[monstero111]

Its never been on tv and i dont need that to see :DDD hahahahahaha

[werehyenataur]

God did it.

[FinnishFuturist]

So you see red and blue and immediately think of the US flag!? There's a difference between patriotism and just being plain brainwashed.

[caffiendkitten]

@FinnishFuturist red blue and green...prime colors genius... not a flag

[galatix27]

@FinnishFuturist I think it might have a little bit to do with forced conversation and trying to awkwardly fit some jokes into a demonstration that doesn't need them.

[gnookergi]

@FinnishFuturist

He's obviously American. It's no brainer to think of your own country before others, such as France.

[Comblit]

@FinnishFuturist hes making conversation

[naturalleoni]

@FinnishFuturist I usually think of the British flag but occasionally the French, Norwegian or Australian flags :)

[baracuda771]

@FinnishFuturist I think of the British Union Jack, even though I'm not from the UK. :D

[SamECircle]

@FinnishFuturist Says someone with the username Finnish Futurist.

I agree, though

[DroPShoTShArPShOoTeR]

@FinnishFuturist aren't we all brain washed by all politics?

[zayah42806]

@FinnishFuturist

there the primary colors!!!

[Grdankl]

its like a uranium cetrifuge

[MyTt10]

hahaha 1:29 TOTAL thats what she said!! hahhahaha

[Jaysonzheng]

hydrodynamic at low reynolds numbers. kind of high-viscous liquid was applied.

[boomboompow3000]

seen this before but good vids

[jzzsxm]

"Reynolds number less than one"

"Laminar Flow"

I mean, those two MAY apply to this, but it's hardly relevant to the fact that it's reversible.

[dchristiaan]

@jzzsxm If Re>1 and the flow was turbulent, the mixing of the fluid would be irreversible as the dye would entrain the cornsyrup in a "random process". Here it just spreads out in a thin ribbon which can be wound back up..

[rdmbox95]

@jzzsxm laminar means non-turbulent. If it is turbulent, then it is chaotic, and extremely unlikely to go back to its original state. the lack of turbulence means that the only forces being applied to the inks are around the cylinder due to the rotation, and they are not mixed in a chaotic way.

[ChrisMills90]

@jzzsxm

I think it's pretty relevant. The relatively low Reynolds number combined with the high viscosity keep the flow laminar along the sheet boundaries. That's what makes the process highly reversible. The high viscosity prevents the boundaries from breaking down in a short time scale, and the reynolds number means that its relatively easy to just apply an opposite torque and have everything move back into place.

[ChrisMills90]

@jzzsxm I just realized who you were. Oh my god.

[jigglesnap]

Journalists are so stupid

[naturalleoni]

@jigglesnap I usually think of the British flag....but occasionally the French, Norwegian or Australian flags :)

[diario292]

is only low reynolds number, reversibility condition...

[hermoineglitter]

u deserve hundreds of awards!or u deserve to be one of those guyz oin the guiness world of records

[Kirolies]

he does

[keyser66guitarist]

He deserves so many more views... 8600?!?

Cmon...

[redhawk781]

sick

[ThePotatoes]

that is awesome!

[cornchipper4cp]

cool