Understanding Pressure Losses and Calculation Methods

[physea]

Hello,

The Darcy losses are pressure losses in the dynamic, static or total pressure?

Also, the pressure losses in various fittings (eg. bends) are they dynamic, static or total pressure?

Also, how can we calculate the static pressure? Is it the hydrostatic pressure of the amount of water flowing in the pipe? What is it exactly?

Thanks!

 

[berkeman]

https://en.wikipedia.org/wiki/Darcy–Weisbach_equation

 

[physea]

https://en.wikipedia.org/wiki/Darcy–Weisbach_equation

Well done, can you find in that article the term 'dynamic pressure' or 'static pressure' ?
Additionally, there are two more questions in my post.

 

[jrmichler]

Read the Wikipedia article very carefully. Then get a copy of Crane Technical Paper N. 410: Flow of Fluids Through Valves, Fittings, and Pipe. You can find it free online. TP 410 is a standard reference for anybody interested in fluid flow.

 

[russ_watters]

The Darcy losses are pressure losses in the dynamic, static or total pressure?

Also, the pressure losses in various fittings (eg. bends) are they dynamic, static or total pressure?

What do you know about dynamic pressure? Specifically, along a constant diameter pipe, is the velocity pressure the same, higher or lower at the end than the beginning?

Also, how can we calculate the static pressure? Is it the hydrostatic pressure of the amount of water flowing in the pipe? What is it exactly?

Static pressure is pressure of a non-moving fluid or if your fluid is moving, it is pressure measured when moving with the fluid. Calculating it depends on the situation.

 

[physea]

I am not sure we no one replies clearly and you prefer setting riddles.

Dynamic/velocity pressure stays constant, so Darcy losses represent static pressure only? In case the diame

What is the equation for static pressure?

 

[russ_watters]

I am not sure we no one replies clearly and you prefer setting riddles.

It's because forcing y ou to think is a surer way to make you understand than spoon feeding you the answer.

Dynamic/velocity pressure stays constant, so Darcy losses represent static pressure only?

Correct!

What is the equation for static pressure?

There is no one equation for static pressure. It's usually a given, not a calculation.