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Tweet me Laminar flow pics:http://bit.ly/LaminarTWEET

If you've ever seen flowing water look frozen like glass... that's Laminar flow

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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:

https://en.wikipedia.org/wiki/Laminar_flow

Reynolds Number:

https://en.wikipedia.org/wiki/Reynolds_number

Osborne Reynolds

https://en.wikipedia.org/wiki/Osborne_Reynolds

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

https://en.wikipedia.org/wiki/Reynolds-averaged_Navier%E2%80%93Stokes_equations

Other Fluid Dynamics videos on Smarter Every Day:

Vortex Collision

https://www.youtube.com/watch?v=EVbdbVhzcM4

Shockwave Schlieren:

https://www.youtube.com/edit?o=U&video_id=BPwdlEgLn5Q

The walking water mystery

https://www.youtube.com/watch?v=KJDEsAy9RyM

Files

Why Laminar Flow is AWESOME - Smarter Every Day 208

Click here if Laminar flow is awesome: http://bit.ly/Subscribe2SED Get a total of $80 off (8 free HelloFresh meals in first month) go to https://bit.ly/2PGu55r and enter "smarter80" ⇊ Click below for more links! ⇊ Tweet me Laminar flow pics:http://bit.ly/LaminarTWEET If you've ever seen flowing water look frozen like glass... that's Laminar flow ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION 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: https://en.wikipedia.org/wiki/Laminar_flow Reynolds Number: https://en.wikipedia.org/wiki/Reynolds_number Osborne Reynolds https://en.wikipedia.org/wiki/Osborne_Reynolds Feeling froggy? Reynolds-averaged Navier-Stokes equations to solve on your lunch break: https://en.wikipedia.org/wiki/Reynolds-averaged_Navier%E2%80%93Stokes_equations Other Fluid Dynamics videos on Smarter Every Day: Vortex Collision https://www.youtube.com/watch?v=EVbdbVhzcM4 Shockwave Schlieren: https://www.youtube.com/edit?o=U&video_id=BPwdlEgLn5Q The walking water mystery https://www.youtube.com/watch?v=KJDEsAy9RyM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Tweet Ideas to me at: http://twitter.com/smartereveryday I'm "ilikerockets" on Snapchat. Snap Code: http://i.imgur.com/7DGfEpR.png Smarter Every Day on Facebook https://www.facebook.com/SmarterEveryDay Smarter Every Day on Patreon http://www.patreon.com/smartereveryday Smarter Every Day On Instagram http://www.instagram.com/smartereveryday Smarter Every Day SubReddit http://www.reddit.com/r/smartereveryday Ambiance and musicy things by: Gordon McGladdery did the outro music the video. http://ashellinthepit.bandcamp.com/ The thought is it my efforts making videos will help educate the world as a whole, and one day generate enough revenue to pay for my kids college education. Until then if you appreciate what you've learned in this video and the effort that went in to it, please SHARE THE VIDEO! If you REALLY liked it, supporting Smarter Every Day on Patreon is the most turbo-awesome way to help. http://www.patreon.com/smartereveryday Warm Regards, Destin

Comments

Kristy

I love that you include the trials that don;t quite work out. Like flooding your workroom by poking a pencil through the kiddie pool. It looked like you were using a classic No. 2 pencil -- surely not! It wasn't hexagonal, was it?

Nick Sullivan

Why is the video quality capped at 360p?

Li Yuanhe

Is it possible to show the difference between laminar and turbulent using Schlieren imaging under water? (Or through a body/layer of water?)

Glenn Watson

I suspect some of that has to do with the fact some of the videos embedded are much older (I remember seeing one of them on Smarter every day 2)

Halbereth

I LOVED the phone under the fountain clip! I wonder, would it be possible to make a fountain with that bubble/dome effect large enough that people could stand under it? There could be a little something to divert the flow for a wedge-shaped section so people could get in and then wander around underneath. Or would it not work at that scale (too much opportunity for air movement to mess up the flow of the water)?

Daniel Ryan

DESTIN! This video is quintessential Smarter Every Day! I absolutely loved this episode. This episode fully captured what makes your channel great - an interesting subject enthusiastically explained by someone who is genuinely excited about the subject and actually learns with the viewer. Your actual brain freeze realization when you made the laminar bubble and growing amount of holes in your pool really made this video for me. I love how your brain looks at the world, and its videos like these that make me glad to support you and your channel.

Daniel Ryan

Also, LAMINAR FLOW IS THE BEST FLOW!

Frank Graffagnino

absolutely love you Destin... love these videos. But I'll have to find another way to support... I can't, in good conscience, give any more money to Patreon. I hope you understand.

Wolfgang Englbrecht

Hey Destin, I enjoy your videos for some time now and just joined team Patreon to support you. Loved the luminar flow episode, LUMINAR FLOW IS THE BEST KIND OF FLOW!!!

Nugget

"Smarter Every Day just became a patron of Captain Disillusion" heh

Michael Curry

I've passed on your love for Laminar Flow to many friends, plus you've also made me look out for Laminar Flow wherever I go - I thank thee Destin!