Why Laminar Flow is AWESOME - Smarter Every Day 208

  • Published: 27 January 2019
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    If you've ever seen flowing water look frozen like glass... that's Laminar flow


    Personally, I find calculating Reynolds number to be quite difficult.
    It's done differently depending on what type of flow you have. A pipe is calculated different than an airplane wing etc.
    Some fluid dynamicists would tell you that it's an exact science. I personally feel that it's a bit subjective.
    The most difficult parameter to nail down in my humble opinion is the characteristic length.
    It's pretty easy for pipes, you just measure the diameter... but wings, plates, vortices...get complicated quickly.

    You'll notice in the video I refrained from saying anything like
    "Flow is laminar when Reynolds number is less than XXX" or
    "Flow is turbulent when Reynolds number is more than XXX".
    There are different schools of thought on this. Typically the transition between laminar flow and turbulent flow occurs somewhere between 2100 and 4000 (Reynolds number is unitless).

    Laminar Flow:

    Reynolds Number:

    Osborne Reynolds

    Feeling froggy? Reynolds-averaged Navier-Stokes equations to solve on your lunch break:

    Other Fluid Dynamics videos on Smarter Every Day:
    Vortex Collision

    Shockwave Schlieren:

    The walking water mystery

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    Warm Regards,


Comments • 11 021

  • SmarterEveryDay
    SmarterEveryDay   7 months back

    Laminar flow 4 Life (it's a subscription link) → http://bit.ly/Subscribe2SED

    • Misha Martynov
      Misha Martynov  2 weeks back

      Hi Destin
      What if lamiar flow was to be poured of a high building? would it stay in one peace? if it was to work I would imagine it wouldn't be restricted by air resistance and would be able to reach high speeds at the bottem

    • Matias Rossi
      Matias Rossi  2 weeks back

      if you think that laminar flow looks cool on fountains hear this... Blood in your arteries and veins must have laminar flow because if not clots are created and then that can cause strokes and heart attacks

    • coltrain Dontworryboutit
      coltrain Dontworryboutit  2 weeks back

      You can tell dad did most of the work on her project

    • Sara Zuhair
      Sara Zuhair  3 weeks back

      Do you know about laminar blood flow in the heart? Blood passing fast from all those valves manages to stay laminar. Would like to see a video about that. Thank you for making these videos. We appreciate it sincerely.

  • Jonathan Finger
    Jonathan Finger  2 hours back

    The fountain is cool with fog it makes the fog stay in u till something disroups the bubbleish

    • Colton Campbell
      Colton Campbell  7 hours back

      'Some dad's don't teach their kids cool stuff, like laminar flow'

      'Oh, I already know aliensss anddd, all that stuff' 😂

      • Ryan Xu
        Ryan Xu  8 hours back

        Pause the vid at 7:10

        • Raymond D
          Raymond D  21 hours back

          Why would anyone hit the dislike on this video!! I really don't get it! Laminar flow is AWESOME!!!! I have a feeling the people hitting the dislike are those that think "science is stupid", thus a sign our education system in serious need of an overhaul.

          • Jacob Zuzga
            Jacob Zuzga  22 hours back

            When u poked holes u should of flex taped it

            • Kane34572
              Kane34572  23 hours back

              One time I was at work as a cook draining the grease trap for our grill and the grease had laminar flow going into the bucket, didnt even look like it was moving, it looked like a solid shiny flow. SOOOO Satisfying

              • Mats Karlsson
                Mats Karlsson  1 days back

                Here's one vote for laminar flow and a subscribe.

                • t g
                  t g  1 days back


                  • Dean Smith
                    Dean Smith  2 days back

                    laminar flow very important in plastic moulding.....

                    • Skoopy
                      Skoopy  3 days back

                      My Strange Addiction, Episode 132: Laminar Flow.

                      • epiphonium
                        epiphonium  3 days back

                        OK ... 8: in this was crazy ... good job !

                        • Doug Less
                          Doug Less  5 hours back

                          epiphonium don’t do crack

                      • WaveafterWave
                        WaveafterWave  3 days back

                        Did u use flex tame to fix that hole u know it’s water proof u can just SLAP it on and it will STICK

                        • schmick125
                          schmick125  3 days back

                          The P51 Mustang was the first fighter to have Laminar flow wings which gave them a significant advantage and better air speed!

                          • Pero Juric
                            Pero Juric  4 days back

                            Kid makes an awesome laminar flow science project.
                            Dad making holes through a plastic pool with a various sharp objects.

                            • JustinCaseDK
                              JustinCaseDK  5 days back

                              You honestly made me love laminar flow! :O

                              • hypeserver
                                hypeserver  5 days back

                                I spot water tower place in Chicago...

                                • Yoav guby
                                  Yoav guby  5 days back

                                  Your such a cool dad, man i wish you were my dad, teach me stuff like that 5:37

                                  • Luis Cabrera
                                    Luis Cabrera  5 days back

                                    This video helped me decide to subscribe.

                                    • Elio Medina
                                      Elio Medina  5 days back

                                      It is so much fun discovering this. When you think about ants and flies how they can stand on bubbles due to surface tension. We can make bubbles at our scale with laminar flow. What an epiphany I just had!!!!

                                      • Aeneas
                                        Aeneas  6 days back

                                        In belgium there is this pool And at the side for kids They have a little fountain in the pool but it is like a bubbel so you Can stand inside it

                                        • Boris Selbstadler
                                          Boris Selbstadler  7 days back

                                          Why didn't you just use a hosepipe?

                                          • MinecraftDude446
                                            MinecraftDude446  7 days back

                                            did you go to the space and rocket center in huntsville alabama

                                            • Pamela Tollett
                                              Pamela Tollett  1 weeks back

                                              Loved it! Thank you...liked and sub'd...oh and so did my 12 yr old son! We watched it together and are wanting to put together the wind flow box...very amazing and so so neat.

                                              • scott ferguson
                                                scott ferguson  1 weeks back

                                                Turbulence is infinitely more interesting and the greatest unsolved problem of classical physics - Richard Feynman
                                                what you know about that

                                                • The Renaissance Builder

                                                  What effect would surface tension have on laminar flow?

                                                  • Sandbull22
                                                    Sandbull22  1 weeks back

                                                    Hey! Shout out chattanooga! That's the creative discovery museum

                                                    • prasun saha
                                                      prasun saha  1 weeks back


                                                      • Webstrike 445
                                                        Webstrike 445  1 weeks back

                                                        No it’s not laminar flow is parrelel water

                                                        • Sridatta Marati
                                                          Sridatta Marati  1 weeks back

                                                          Please don't waste Water for the sake of Laminar flow

                                                          • ABDesigner1
                                                            ABDesigner1  1 weeks back

                                                            Flex tape? Anyone?

                                                            • Churroburps
                                                              Churroburps  1 weeks back

                                                              My sink has it it’s so cool

                                                              • MisterZigg
                                                                MisterZigg  1 weeks back

                                                                6:54 Have you never hand washed a spoon?

                                                                • Tim Verhaal
                                                                  Tim Verhaal  1 weeks back

                                                                  Drinking game: drink every time he says laminar flow

                                                                  • Justin Kim
                                                                    Justin Kim  1 weeks back

                                                                    What is she going to regionals for?

                                                                    • kami79x
                                                                      kami79x  1 weeks back

                                                                      Fam when i wash spoons i make laminar sheet things yeah

                                                                      • Roodj1
                                                                        Roodj1  1 weeks back

                                                                        Hey, I have that pool. Ohh, and NASA has a few good videos on this and how ice screws with air flow.

                                                                        • Cynical
                                                                          Cynical  1 weeks back

                                                                          ngl this is a bit cringy

                                                                          • The Best7878
                                                                            The Best7878  1 weeks back

                                                                            My teacher would have freaked out at the display when we were learning about airfoils in engineering

                                                                            • Cashuma
                                                                              Cashuma  1 weeks back

                                                                              . . . YESSSSS SSSSIR . . . YESSSSS SSSSIR . . .

                                                                              • MyMouseBroke
                                                                                MyMouseBroke  1 weeks back

                                                                                6:57 thats already a thing in kiddy pools at water parks with the big mushroom looking thing

                                                                                • Kids4 Cool
                                                                                  Kids4 Cool  1 weeks back

                                                                                  8:25 he be Recording on a Android😂😂

                                                                                  • Sion Paddy
                                                                                    Sion Paddy  5 days back

                                                                                    Yeah he probably is considering it survived being put in water for 2 seconds

                                                                                • Jasper Peng
                                                                                  Jasper Peng  1 weeks back

                                                                                  "you just don't appreciate laminar flow!"
                                                                                  loved it.

                                                                                  • pavit kailay
                                                                                    pavit kailay  1 weeks back

                                                                                    1:34 guy uses this one weird trick to make his girlfriend SCREAM

                                                                                    • Saksham Walia
                                                                                      Saksham Walia  7 days back

                                                                                      The guy is married.

                                                                                    • pavit kailay
                                                                                      pavit kailay  1 weeks back

                                                                                      @Gunjan Kumar and then this happens 13:45

                                                                                    • Gunjan Kumar
                                                                                      Gunjan Kumar  1 weeks back

                                                                                      and he watches turbulent flow jetting out moments later

                                                                                  • sean Hammer
                                                                                    sean Hammer  1 weeks back

                                                                                    Wonder if we could mabe control matter someday like the laminar flow to make a force field like that

                                                                                    • StonyRC
                                                                                      StonyRC  1 weeks back

                                                                                      I LOVE the sense of wonder and excitement you show with what at first glance appear to be mundane phenomena. I've felt that my entire life about science and technology - I never cease to be amazed at how cool our universe is.

                                                                                      • wild fire
                                                                                        wild fire  2 weeks back


                                                                                        • Paul C
                                                                                          Paul C  2 weeks back

                                                                                          The hole isn't right is the answer.