Question on Fluid Pressure in Pipes

AI Thread Summary
In fluid mechanics, pressure drops in pipes with uniform diameter occur due to friction, which is influenced by the pipe's relative roughness. Unlike the Bernoulli equation, which assumes constant pressure, the presence of friction results in a gradual pressure decrease along the pipe length. This frictional loss is a key factor in understanding fluid flow in real-world applications. The discussion emphasizes the importance of considering friction factors when analyzing fluid behavior in pipes. Understanding these concepts is essential for solving fluid mechanics problems effectively.
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Hi, I was doing my fluid mechanics howework, and there was a question that I couln't quite answer.

Assuming that the integral of the axial momentum remains constant along the pipe cross section, the pressure drops uniformly along the pipe length. (Contrary to the Bernulli equation where the pressure is supposed to stay constant)

I was wondering if anyone had a non-mathematical way of explaing why a pressure drop exists in a pipe with uniform diameter..

Thanks, as always.
 
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In all pipes there is a relative roughness which is associated with a friction factor. This friction can cause pressure drops.
 

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