Increasing pipe size and then decreasing

[dadthedestroyer]

TL;DR

Seen many videos on YouTube of a guy who increases the size of a pipe and then he decreases it back to the original. It seems like the water is flowing faster or he’s getting increased pressure per se. How does this work does the pipe is a tank and explanation would be nice.

Seen a lot of videos of a guy increasing and decreasing the pipe size on YouTube and changing the flow of water or the pressure. It seems an explanation of how this works would be nice. I understand a little bit about flowing pressure. Is there any other things that involved in this?

 

[scottdave]

A link to an example video would be helpful.

Pressure and cross-sectional area are factors, as well as the viscocity of the liquid and the inner surface of the pipe.

 

[Lnewqban]

Seen a lot of videos of a guy increasing and decreasing the pipe size on YouTube and changing the flow of water or the pressure. It seems an explanation of how this works would be nice. I understand a little bit about flowing pressure. Is there any other things that involved in this?

Welcome!

Pumps increase the internal energy of a mass of water, while friction decreases it.
That internal energy of the moving mass of water manifests itself in three forms: flow velocity, internal pressure or height.

For a short run of pipe, we can consider that the energy inside the flow remains constant along the pipe.
Because of that, the summation of those three forms of energy must remain the same.

For smaller diameters of a horizontal pipe, the velocity increases, but the internal pressure decreases, and vice-verse.

Please, see:
https://courses.lumenlearning.com/suny-osuniversityphysics/chapter/14-6-bernoullis-equation/