Pipe Flow- Transition from Turbulent to Laminar Flow

Transition from turbulent to laminar flow for a pipe with a rounded entrance

This was recorded as part of a laboratory experiment and posted to share with my lab partners for later reference.

The pipe is a long round pipe with a rounded entrance at the bottom of the tank. The tank was filled and then allowed to drain through the pipe- there is no valve installed. This means the tank head is decreasing over time, and the flow rate is decreasing as well.

It switches back and forth between laminar and turbulent flow because the flow rate is not perfectly stable, but you can see that over time the flow does fully transition from turbulent to laminar flow.

[nilsnilsson]

The audience now has to pee. Thanks for watching.

[jthagreat]

This audio is great, I played this video at 1:22 am and my wife peed in her sleep. Will be using this video/audio in the future

[mortenrl]

To some people, these are serious matters with great applications. I personally don't know why I spent 7 minutes watching water running through a tube. But I'd do it again.

[hamedsafari]

thank you so much.
that was worth-watching till the end.

[sebastianbottger]

Is there a formula for the relation of pressure to tube diameter to achieve the conditions for laminar flow? Is only one state possible?

[Gowidafloman]

How are you switching between the two flow regimes? Just turning down the velocity?

[dennishillg]

During this experiment, is the measured flow rate of the water changing at the exit point? Gallons per minute or usage decreasing

[chadcase]

Might like it if I could hear more then running water.