[GeonwooKim]

Hi there,

This more of a general fluid mechanics question, which I've had no luck in finding the answer, but here goes anyway:

For cd nozzle with constant pressure condition(inlet, outlet), are there equations to calulate the velocity decrease due to friction in nozzle?
I mean that the roughness constant and roughness height causes a frictional pressure drop, but how does this effect the velocity as function of length?

Any response will be appreciated.