Pipe Flow: Neglecting Pipe Length

[joejoekelly1]

In the diagram attached I have a pipe (standard concrete) that is going from point A (Entrance) to point B (Exit). Standard water is the fluid within the pipe. Point A (entrance) has a constant uninterrupted supply of water at a velocity of 0.7m/s, how do I find the correct velocity at point B (Exit), given that the distance is between point A and Point B is very long? This problem is going around in my head for quite some time now. I have used Bernoulli’s equation to solve for V at point B but I am concerned about the length of the pipe and that neglecting it may be over simplifying the problem. Could it not reduce the velocity over a long distance?

 

[rude man]

Yes it could. Any fluid with finite viscosity moving past any kind of rough surface would generate heat and thus dissipate some of the kinetic energy of the fluid.

This subject is not typically covered in an introductory course.