A set of empirical correlations showing how Darcy friction factor depends on Reynolds number
and roughness LaTeX Math Inline body \rm Re
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Fig. 1. Moody Chart showing how Darcy friction factor depends on Reynolds number and roughness
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See also
Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation / Darcy friction factor
Reference
Moody, L. F. (1944), "Friction factors for pipe flow", Transactions of the ASME, 66 (8): 671–684