A 0.30-m-diameter cast iron pipe is carrying 0.20 /s of water at 20°C. If the observed shear stress on the pipe boundary is 30 N/, calculate and plot the velocity distribution using both the smooth...

A 0.30-m-diameter cast iron pipe is carrying 0.20

/s of water at 20°C. If the observed shear stress on the pipe boundary is 30 N/, calculate and plot the velocity distribution using both the smooth and rough pipe assumptions. Which assumption is more accurate for this case?

Using the data in Problem 7.20, determine the velocity profile using the 1/7 power law and compare the logarithmic rough wall law.