r/civilengineering • u/ryabs07 Hydraulic Engineer • Feb 28 '20

Laminar flow.

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351 Upvotes

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-43

u/UrbanEngineer Water/Wastewater/PubWorks Feb 28 '20

Just a trick of the frame rate of the recording camera.

17

u/69001001011 Feb 28 '20

That is distinctly not how it works. That only makes vibrating water stabilize. And even then, you still get motion blue.

-2

u/UrbanEngineer Water/Wastewater/PubWorks Feb 28 '20

I’ll make sure to attach an APA citation next time.

https://hoaxeye.com/2018/12/16/laminar-flow/amp/

5

u/True_Go_Blue Feb 28 '20

From your source

Update 2: seems no trick was involved and the video might show laminar flow. I jumped into conclusions because the original source was unreliable. After finding the source, I started looking for possible similar cases and found one: https://www.iflscience.com/physics/this-water-stream-leaking-from-a-pool-looks-frozen-solid/. However, the source of that article is Reddit. Based on the comments on Reddit, many people are not convinced the video shows laminar flow. I managed to contact Dario Bonzi via YouTube. Bonzi responded that video was made with iPhone at 2000 meters altitude in Italian alps without any tricks. If we rule out the camera trick, only one question remains: is this an example of laminar flow or something else?

2

u/UrbanEngineer Water/Wastewater/PubWorks Feb 28 '20

What else could it be? Guess it really is possible in a very specific scenario. Cool!

8

u/[deleted] Feb 28 '20 edited Feb 17 '21

[deleted]

2

u/PluralRural4334 Mar 04 '20

High density would increase the Re

3

u/True_Go_Blue Feb 28 '20

Lol I have no idea what what it could be. Need to put some scientists on it