Laminar Flow

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  • Опубликовано: 24 дек 2024

Комментарии • 677

  • @cpanati
    @cpanati 8 лет назад +587

    The cylinder is filled with high viscosity glycerol. Piped in are droplets of corn syrup (different viscosity) colored with food dye. Stir too quickly and they will mix; it's called turbulent flow. But, stir slowly, laminar flow, and the layers remain separate; like cards shuffled through a deck. Since the layers never truly mixed, they can be carefully separated back into their original states. Interesting physics; complex math.

    • @vanchark
      @vanchark 6 лет назад +6

      cpanati same thing with toothpaste. Ever noticed how you always get nice layers? It's because of you squeeze slow enough, the layers remain separate. But if you hit it with a sledgehammer, it'll mix.

    • @danieldevito6380
      @danieldevito6380 6 лет назад +16

      Actually, you are completely wrong. The reason why the colors return back to the original position is that, by using a thick liquid like corn syrup, as well as the cylinder that is designed to spin, exactly, the same way forward and backward, it lowers the number of random movements into the system, entropy. Since you can control any movement either way, as well as eliminate any random movement in the liquid, you are able to, essentially, undo any mixture within. The colored drops are, without question, mixed, it's just easy to unmix due to low entropy.

    • @geovannivalencia2823
      @geovannivalencia2823 6 лет назад

      SMART🤓

    • @NCarolina4455
      @NCarolina4455 5 лет назад +1

      Re = (UD)/v !!
      In other words, (fluid velocity * inner diameter) / kinematic viscosity.

    • @kreekevol3739
      @kreekevol3739 4 года назад

      It's always complex maths

  • @katspiers7
    @katspiers7 13 лет назад +4

    This is not a fake. I think it is amazing and it shows an extreme amount of creativity and intelligence to even come up with this. No more criticisms from people who obviously don't know enough about the subject.

  • @Newtoon
    @Newtoon 17 лет назад +19

    This is a classic of Fluid Mechanics courses (I did it) and is called the "Taylor-couette experiment" .
    Because the fluids involved are thick and movement is slow, the flow stays laminar and not turbulent : there is no mixing. If one day you tried to mix 2 think paint colors, you know things are not easy to do without a though mixing !
    The video should have shown what happens if we move the cylinders far more faster.

  • @Mysteroo
    @Mysteroo 8 лет назад +725

    at first I was like, meh. Kinda cool.
    And then it reversed
    Haven't seen my jaw since

  • @Merthalophor
    @Merthalophor 9 лет назад +47

    He rotated 7 times instead of 5, but apart of that, that sh*t is amazing.

  • @awahlie
    @awahlie 8 лет назад +99

    should it bother me as much as it does that they miscounted

    • @joec1029
      @joec1029 8 лет назад +9

      bothers the crap out of me too. I started reading comments just to see if anyone else felt the need to point that out. 6.5 turns...

    • @Ozymandius65
      @Ozymandius65 8 лет назад +1

      But it's understandable when you get up into such high numbers you lose your place, plus he had to concentrate on speaking into the microphone that was on the other side of the room.

  • @aarken9744
    @aarken9744 10 лет назад +277

    That''s really cool... and they're really bad at counting rotations.

    • @AndreasFelix
      @AndreasFelix 10 лет назад +10

      indeed they are. was the funny part of this vid.

    • @-drcoconut-9240
      @-drcoconut-9240 7 лет назад +9

      +PublicEnquiry
      ???

    • @Nflrealtime
      @Nflrealtime 4 года назад +5

      @PublicEnquiry lol what

  • @bartjebeltegoed
    @bartjebeltegoed 15 лет назад +3

    Within this system the entropy is already at maximum at start... the red, green, blue, and the liquid are all in equilibrium. When he spins, the flow is laminar, and therefore time-reversible. An involution function exists. Although some heat is generated due to friction (highly viscous). This causes a temp gradient, more order -> entropy decrease. And that's why the liquids did not exactly return to the state they were in, but slightly different.
    Correct my if i'm wrong ;)

    • @butwhoasked1821
      @butwhoasked1821 Год назад

      I believe the flow also needs to be incompressible, such that you are at a Stokes Regime (Re

  • @cutiepiebb
    @cutiepiebb Год назад +2

    this video was uploaded 16 years ago. amazing

  • @thewhuthut
    @thewhuthut 17 лет назад +3

    my favorite saying is that wonder is the seed of science, and when my kids and their friends and my grandbabies saw this, it just hit me like a ton of bricks. thank you for the enlightenment from this grateful grandma.

  • @yoonki
    @yoonki 17 лет назад +2

    With low Reynolds number (Re < 1) those kinds of processes are reversible because the flow remains laminar (as opposed to turbulent). As long as the process is not turbulent, substances in the medium will not mix.

    • @-8l-924
      @-8l-924 2 года назад

      thank you, I couldn’t hear the term he used at the point where he mentions this.

  • @JokerDoom
    @JokerDoom 12 лет назад +1

    They weren't mixed in the first place, that's the trick of laminar flow. The colors flow parallel to each other instead of mixing randomly like you'd see in water or air because corn syrup is a high-viscosity fluid.

  • @garyhoffman3115
    @garyhoffman3115 10 лет назад +3

    I just watched the entire video and completely amazed by this laminar flow.

  • @kathrynlang5383
    @kathrynlang5383 9 лет назад +17

    this is oddly comforting

  • @OhRishtopher
    @OhRishtopher 13 лет назад

    I don't get why people would think this is fake...it's supposed to demonstrate laminar flow.
    "The apparatus, called a "Couette Cell," was developed by John DeMoss and Dr. Kevin Cahill, and uses dyed corn syrup to demonstrate how a fluid with a sufficiently low Reynolds number will flow along distinct paths in parallel layers (like fanning a deck of cards), thereby preventing disruption of the fluid." - Robert T. Gonzalez (from io9)
    Actually, the link in the description tells you everything.

  • @kkrdgulzar
    @kkrdgulzar 17 лет назад +15

    That is amazing! I teach part of this and I will be using this video, if you do not mind! For those who understand fluid dynamics, this is a great visual.

  • @1schwererziehbar1
    @1schwererziehbar1 9 лет назад +54

    encryption / decryption

    • @MrSammyTeee
      @MrSammyTeee 5 лет назад +1

      I'd say compression as some of the original data was lost but its still viewable

  • @MichaelBoquist
    @MichaelBoquist 5 лет назад +2

    That's the most enlightening potato-cam video I have seen all day.

  • @camerontrivett1772
    @camerontrivett1772 3 года назад +1

    This video does kinda suggest laminar flow occurs at Re < 1 which is untrue it's Re< 2000 (well there's a transition area too )
    But THIS mostly occurs at the very very low laminar flow rates

  • @sobeita
    @sobeita 11 лет назад +1

    Are the added blobs at different distances from the center? It looks as though they're actually overlapping, but maybe that's forced perspective.

  • @Sgrunterundt
    @Sgrunterundt 16 лет назад

    I am amazed that there is no one (at least not on page one - haven't checked the others) shouting "FAKE".
    There may yet be hope for youtube...
    Nice demonstration, we are building one at our university now.

  • @danieldevito6380
    @danieldevito6380 6 лет назад +9

    The reason why the colors return back to the original position is that, by using a thick liquid like corn syrup, as well as the cylinder that is designed to spin, exactly, the same way forward and backward, it lowers the number of random movements into the system, entropy. Since you can control any movement either way, as well as eliminate any random movement in the liquid, you are able to, essentially, undo any mixture within. The colored drops are, without question, mixed, it's just easy to unmix due to low entropy.

  • @austintan9732
    @austintan9732 13 лет назад

    The Reynolds number, R, is the dimensionless combination:
    R=ρνR/η
    in which ρ is the density, ν the speed of fluid, R the size of the flow, and η the viscosity.
    fluid with low Reynolds number will perform such laminar flow.

  • @SkydivingSquid
    @SkydivingSquid 4 года назад +2

    My mind is absolutely blown. By the way, he turns it 6.5 times, but miscounted on the initial mix up. That's why it takes 6.5 turns back to equalize.

  • @skua675
    @skua675 11 лет назад +1

    Basically, the just applied the exact same force in the opposite direction. Imagine you have a ball and shove it along a flat surface. When it comes to rest, you shove it back to where it came from, with the same force. Should end up where it started, yeah? Same principle in effect here. Usually it doesn't work because stirring things fast causes turbulent flow, which mixes things unpredictably, but if you stir thick liquids slowly like this, everything stays nice and smooth (and reversible)

  • @MrEcheljohn
    @MrEcheljohn 12 лет назад +1

    Ha... I just finished reading David Bohm's Wholeness and the Implicate Order a few weeks ago and this is one of the many analogies he gives in his book. Awesome to see it in action.

  • @leiqunni
    @leiqunni 2 года назад

    I've been looking for this video for a long time!

  • @BM03
    @BM03 12 лет назад

    The wizardry here is immense. I was blind before watching this video. It was so powerful that it was the first, and the last, thing I ever saw.
    Now I'm dead.

  • @physjim
    @physjim 13 лет назад

    @kenny8331 yeah i thought so. Watching how slowly he rotates this thing comes to mind a significant aspect of reversable processes; they are at all times in thermodynamical equillibrium and in order for that to happen the process must be done comparatively slowly

  • @thefuzzydirector
    @thefuzzydirector 12 лет назад +1

    How can people dislike this awesome video!

  • @dohara77
    @dohara77 13 лет назад

    @HUNNAI9095
    You can use any liquid with a high viscosity. I did it with corn syrup and it worked really well

  • @liamlemur
    @liamlemur 12 лет назад

    nice and specific there, is it my touch typing technique that bothers you?

  • @lidarman2
    @lidarman2 15 лет назад +1

    The change in entropy was there. It was the fact the the restored blobs were not exactly the same as the original.

  • @ahmetalperx
    @ahmetalperx 5 лет назад +98

    Barış Özcan'dan gelenler ?

    • @yasinguzel7727
      @yasinguzel7727 5 лет назад

      Ahmet Alper Peki nasıll???

    • @fulyayassbas886
      @fulyayassbas886 5 лет назад

      streetartglobe dan geldim

    • @b4dguy596
      @b4dguy596 5 лет назад

      biri bana mi seslendi?

    • @umitfatihcebeci9921
      @umitfatihcebeci9921 5 лет назад

      Benim düşüncem mantığım şöyle ; O katmanlar aynı yerde değil ayrı sıvı odacıklarında bu yüzden birbirlerine hiç karışmıyorlar aslında. Ama biz sadece tek yönden baktığımız için bunu göremiyoruz. Üstten baksan olayı çok net göreceğiz diye düşünüyorum.

    • @arcaipekyun4232
      @arcaipekyun4232 5 лет назад

      Ümit Fatih CEBECİ biri yorumda açıklamış hızlı döndürürnce karışır ama yavaş döndürüyorlar özellikle böylece geri sarabiliyorlar ama tam nasıl plduğunu anlamadım

  • @ninjabob333
    @ninjabob333 16 лет назад

    You can also watch the hand on the right. While it's rotating forward, her finger is up, but while it's rotating backward, she puts it down.

  • @qwerty101ize
    @qwerty101ize 12 лет назад

    what was the clear substance in the glass? i assumed water at first but after it looked as if it had some vicosity. i would really like to know as i am a physics student and i have to give a presentation on soemthing bad ass. i want to do this but i need to know what the clear stuff is !! and i have never seen something this crazy woooo! awesome video soo cool,!!

  • @nhanat
    @nhanat 9 лет назад +12

    came from reddit il5 section.. I really can't believe it! awesomeness of science.

    • @abyteuser6297
      @abyteuser6297 6 лет назад

      Reddit too...way of "What is happening to the air movement inside a tire as it begins to turn, as it is turning, and after it stops?"
      www.reddit.com/r/askscience/comments/13muro/what_is_happening_to_the_air_movement_inside_a/

  • @MrTurdTastic
    @MrTurdTastic 13 лет назад

    @Athasish Its a highly viscous fluid, most likely a form of Glycol

  • @Sgrunterundt
    @Sgrunterundt 15 лет назад

    Yes. Flow with low Reynolds number, also called laminar flow.

  • @Ymgarl
    @Ymgarl 15 лет назад

    It appears that it wasn't reversed - there was a hand on the left at the beginning, which moved shortly after the first turn, but it doesn't appear at the end again.

  • @Athasish
    @Athasish 13 лет назад

    Is that transparent liquid the water or the syrup?

  • @0110x
    @0110x 12 лет назад

    anyone care to explain the physics behind how they can unmix back to original states?

  • @el12freddy
    @el12freddy 13 лет назад

    @quantumcahill That's because the system was never really disordered, just "stretched".

  • @ManWatchingtheStars
    @ManWatchingtheStars 13 лет назад

    @TKflyer You mean, 6.5 turns, right? Looks like the guy in the video isn't the only one who can't count.

  • @thewhuthut
    @thewhuthut 15 лет назад +4

    Each time I've seen this, maybe 6 over a year or so, it always takes my breath away. Now I share these wonders with my grandkids, because wonder is the seed of science, and i love to smile about stuff that just knocks me out but leaves my one marble intact. spacequeen2009

  • @madougi3
    @madougi3 13 лет назад

    yo what container u stired them n
    plss i ned as soon as possible

  • @rutz08
    @rutz08 13 лет назад

    @Athasish I don't think its either, too clear to be corn syrup i would think, and the corn syrup die he injected wouldn't just hang there like that if it was water. It is probably something close to the consistency of corn syrup though..

  • @jadedsage5308
    @jadedsage5308 12 лет назад

    Thanks for your wonderfully insightful comment there, kathrynsuz.

  • @BimBims
    @BimBims 10 лет назад +38

    Damn science, you always make my brain confuse

  • @JadeAllenCook
    @JadeAllenCook 10 лет назад

    What is the clear base solution made of?

    • @servantofthe99
      @servantofthe99 10 лет назад +1

      the base solution is corn syrup. the dyes are color dyes mixed with a little bit of corn syrup for consistency.

  • @mikester9er
    @mikester9er 14 лет назад +2

    this is aaabsolutely amazing, i like this an extreme amount.

  • @frankrenan1
    @frankrenan1 14 лет назад

    we watch this when we are stoned!!!!! meester van stroming & warmteleer bedankt!!!!!!

  • @avs99rule
    @avs99rule 13 лет назад +3

    It would be sweet if we had a handle that can reverse entropy like this as well.

  • @Everfalling
    @Everfalling 17 лет назад

    yeah, they look to be spaced away from each other radially. each individual color stretches, but i dont think they overlap.

  • @bruceleezombie
    @bruceleezombie 16 лет назад

    The philosophical interpretation of this phenomena leads us to think about how something can leave its original form but still " be there" and then return. It's a clear example of how subjective or empiric science can be and that , perhaps , instruments are the only limit to knowledge.
    the physical interpretation has been said: laminar parallel flow in viscous medium.

  • @JYPark1101
    @JYPark1101 13 лет назад

    They should have posted another video that is taped from above (or below)...

  • @krayzemli
    @krayzemli 11 лет назад

    The trick is in a chosen view angle. If you look from the top you'll see how this magic works. Layers of liquid are not mixed, they are just moving and deforming.

  • @injusticeanywherethreatens4810
    @injusticeanywherethreatens4810 8 лет назад +5

    What kind of sorcery is this?

  • @theholy0
    @theholy0 17 лет назад

    iPod shuffle is not random. The 'random' setting is based on an algorithm, therefore, predestined by cause and effect... so there.

  • @liamlemur
    @liamlemur 12 лет назад

    I don't have a problem with computer scientists. And i most certainly do appreciate the work that goes into it.

  • @codyfun
    @codyfun 16 лет назад

    Seriously, guys, they DID NOT reverse the video! If you compare the beginning and end of the process, the end has the cornstarch in a slightly messed up position and is slightly spread out. Look and see?

  • @DemonicGoblin
    @DemonicGoblin 16 лет назад

    Didn't they spin that 6 times forward, or am I just too tired to count right?

  • @bartjebeltegoed
    @bartjebeltegoed 15 лет назад

    You are right, totally forgot momentum. Then it's both momentum and a heat gradient which causes the time-irriversibility part...
    The entropy is at minimum from an information point of view? Because the different colors have exactly the same properties right? Equally dense, temperature etc.(Except for color) No reason for it to to mix...?
    I got to read more about entropy ;)

  • @MrZz108
    @MrZz108 11 лет назад +3

    Only a physics major can master Einstein's theory of relativity but cannot count backwards from five.

  • @MeOnStuff
    @MeOnStuff 13 лет назад

    @michealrofail I don't know if you noticed, but you didn't use a single full stop in your comment, so I have no idea what you were trying to say.
    Laminar flow is a proven physical phenomenon...

  • @darabennett4316
    @darabennett4316 8 месяцев назад

    Yo! That's amazing! While I was watching this, and he went backwards, I thought, "wouldn't it be cool if it were to go back to its original form in 3 dots? But that would be impossible. "
    Impossible it is Not! This is super neat.

  • @ilovefunnyvideos216
    @ilovefunnyvideos216 14 лет назад

    can they be other colors?

  • @clpo13
    @clpo13 17 лет назад +1

    They've blinded me...with science! Pretty cool stuff.

  • @glennfrick7975
    @glennfrick7975 2 года назад

    I sometimes contemplate applying thermodynamics to the 4 systems. Heat the caldron up at bit. Heat the 🔴 a bit more. Plop the 🟢in. Cool the 🔵 a bit. Run the system a bit and take some notes

  • @chickenyogurt
    @chickenyogurt 13 лет назад

    Is that a hand-crank time machine
    because that's what it seems like

  • @swetabainslaa
    @swetabainslaa 8 лет назад

    What is inside the cylinder ,is that water or something else?

    • @doordie7560
      @doordie7560 8 лет назад

      it is not water for sure...it is a special type of fluid in which when the flow takes place each & every layer flows separately having different velocities...& none of this layers intersect each other that is why ink is restored to its origional shape...

    • @twdspntw450
      @twdspntw450 8 лет назад

      +do or die it's corn syrup XD

    • @doordie7560
      @doordie7560 8 лет назад

      +sweta bainsla actually I was studying same subject so I just replied...

    • @doordie7560
      @doordie7560 8 лет назад

      +Księżniczka Własnego Królestwa lol..

  • @x0lamborghini0x
    @x0lamborghini0x 11 лет назад

    In a stirred vessel, isn't the Reynolds number for turbulent flow above 10,000

  • @NickSparkss
    @NickSparkss 12 лет назад

    Holy shit, physics is cool. I can't handle the high level math, but I love watching the experiments and demonstrations of fluids with weird properties.

  • @debbielogan676
    @debbielogan676 7 лет назад

    I'm doing this for my science project and I have every material except for the medicine dropper things,or whatever, does anyone know where I can get these or the ones shown in this video? tysm

    • @Rocksaplenty
      @Rocksaplenty 7 лет назад

      yo fam prolly too late here, but if you go to any vape shop (despite your age, just explain what you're doing and that you only need a dropper) they're likely to just give you one for free.

  • @erzaaulia464
    @erzaaulia464 6 лет назад

    My prof should show this be4 fluid mechanics lecture about laminar and turbulent. I was blind before this video and read comments. This is amazing btw. Even some human error showed.

  • @lekunberriko1
    @lekunberriko1 9 лет назад

    food colorant does not float in karo sirup?

  • @patwic92
    @patwic92 12 лет назад

    No, it actually doesn't. Entropy can be overcome by adding energy to the system. What your asking is equivalent of asking if making your bed in the morning violates entropy. Does that make since?

  • @LordJudgement1818
    @LordJudgement1818 13 лет назад

    Their is a local band in my city that has a song called laminar flow. i had to come check this out.

  • @hunterprescott2305
    @hunterprescott2305 4 года назад

    God forbid I don't know the next color coming. Love the video.

  • @MinistryOfMagic_DoM
    @MinistryOfMagic_DoM 11 лет назад

    You stirred forward and backward 6 times sir. You didnt count two until you were on three, but all the same it is a cool concept to see in action.

  • @physjim
    @physjim 13 лет назад

    I wonder if the process was done quicker would the Irreversibility still exist?

  • @danielul05
    @danielul05 6 лет назад

    Thank you
    UNM Physics and Astronomy, very cool!

  • @xOxAdnanxOx
    @xOxAdnanxOx 4 года назад

    can anyone explain what the heck is going on in that glass, I mean how it is laminar flow is affecting?

  • @allamoureux07
    @allamoureux07 15 лет назад

    It's called "liquid memory" and occurs in liquids of low reynolds number and high viscosity

  • @StaciEnglish
    @StaciEnglish 11 лет назад

    Where are you going?

  • @xja85mac
    @xja85mac 16 лет назад

    I think this is not something reversible,fluid layers flow indipendently and dyes don't diffuse into neighbouring layers.Think of this flow as people starting in rows entering a curve and speeding the curve with the same angular velocity,as the hands of a clock,observing them from outside they seem a disordered crowd,but looking them from upside they are disposed as curved rows,so that when you revert the motion,they return in place.
    Blurring of drops at the end is due to non constant speed.

  • @Deadnature
    @Deadnature 16 лет назад

    amazing, i wonder if that would work with water if u moved real real slow...

  • @swss12
    @swss12 14 лет назад

    is that KY jelly?

  • @mansoor9911
    @mansoor9911 14 лет назад

    yes This is true
    if you want to belief see the left hand in the beginning of video bothe hands at the seam time but in the end of video the left hand move away firest and the second thing the shape of the ink is a different in the end and beginning of video.

  • @yogeshdesai1900
    @yogeshdesai1900 11 лет назад

    how that instrument constructed what is in that ?

  • @ibzm
    @ibzm 12 лет назад

    Actually, yes, I was required to take 2 Chemistry classes for my degree in Physics. I also had to take Calc 1, 2, & 3 and Differential Equations. Does that mean i am a failed mathematician?

  • @RandenMiku
    @RandenMiku 14 лет назад

    Very impressive experiment.
    This may be a demonstration about behavior of high viscosity liquid, isn't it ?
    I think this clip is not a Fake.
    Though I'm not a specialist...

  • @bigmikeinoz
    @bigmikeinoz 11 лет назад

    They're definitely at different radii. That is the "trick" to avoid the colours blending.

  • @THERES_BEES_EVERYWHERE
    @THERES_BEES_EVERYWHERE 13 лет назад

    @GillyNotKingofPhilly and how exactly is it fake?

  • @evilpatrik
    @evilpatrik 13 лет назад

    Nice but... Will it blend?

  • @kennykro13
    @kennykro13 12 лет назад

    saw this on a show called Richard Hammond's Engineering Connections.

  • @FlippityFloppittyFlom
    @FlippityFloppittyFlom 5 лет назад

    What sorcery is this?

  • @RyanChristianson
    @RyanChristianson 16 лет назад

    dude that is really cool can you give a supply list so i could do this in school

  • @liamlemur
    @liamlemur 12 лет назад

    i have completed an undergraduate degree in physics, taken undergraduate maths modules and have many friends who studied engineering, i am well aware of the corresponding course content of these degrees.

  • @usmankhan-cs2yr
    @usmankhan-cs2yr 5 месяцев назад

    Can we call this process a reversible for whivh chajge entropy is zero.