Friction losses due to expansion vs losses due to contract

[foo9008]

Homework Statement

i was told that the losses during expansion are usually much higher than losses during contraction in pipe . is it true?why?

Homework Equations

The Attempt at a Solution

 

[haruspex]

Homework Statement

i was told that the losses during expansion are usually much higher than losses during contraction in pipe . is it true?why?

Homework Equations

The Attempt at a Solution

Friction of what on what?

Edit: having seen your next thread, I realize the pipe is not expanding or contracting. It only seems that way to a flow passing along it. (I thought this was about thermal expansion, or expansion under stress.)
And by friction, do you mean viscosity? Turbulence?

 

[foo9008]

Friction of what on what?

Edit: having seen your next thread, I realize the pipe is not expanding or contracting. It only seems that way to a flow passing along it. (I thought this was about thermal expansion, or expansion under stress.)
And by friction, do you mean viscosity? Turbulence?

friction loss in pipe due to sudden expansion and contraction