The discussion centers on determining the appropriate formula for calculating the friction factor in both rough and smooth pipes using the von Karman and Prandtl laws. The user has calculated a friction factor of 0.017 for a rough pipe and 0.014 for a smooth pipe. The key question is which value to use when the pipe type is unspecified. The recommendation is to calculate both values and compare them, while also considering the Reynolds number (Re) for a comprehensive analysis.
PREREQUISITESEngineers, fluid dynamics students, and professionals involved in pipeline design and analysis will benefit from this discussion, particularly those focused on calculating friction factors in various pipe conditions.
well , i have found that the f for rough pipe is 0.017 , nut i am not sure how to find f for smooth pipe using von karman and Prandlt laws ... for smooth pipe , i have 1 / ( surd f ) = 2 log [(3.72 x 10^5) (surd f ) / 2.51 ]BvU said:I was going to propose you do both (assuming some reasonable ##e## for galvanized ion pipe ) and compare ...
On the other hand, you do have the data to calculate Re so I certainly wouldn't leave out that one...
so , do you have any comment on this question / which is correct ?Nidum said: