Question

Using the Moody Chart on page B‐1 of Volume 3 of your text, determine the friction factor (f) for fluid flow in a pipe with a Reynolds number of 6,000 and a relative roughness of 0.035.

Answer 1

The Moody chart gives curves for relative roughnesses 0.03 and 0.04. At relative roughness 0.03, for Reynolds number 6000, friction factor is around 0.064. At relative roughness 0.04, for Reynolds number 6000, friction factor is around 0.07. As a relative roughness of 0.035 is half way between 0.03 and 0.04, we can interpolate the corresponding friction factor as half way between 0.064 and 0.07; which is (0.064+0.07)/2 = 0.067. Therefore, the friction factor for fluid flow in a pipe with Reynolds number of 6000 and a relative roughness of 0.035 is approximately 0.067.

The answer is 0.067

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