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@wikipedia


A set of empirical correlations showing how Darcy friction factor depends on Reynolds number 

LaTeX Math Inline
body\rm Re
 and  roughness 
LaTeX Math Inline
body\epsilon
 (see Fig. 1).


Fig. 1. Moody Chart showing how Darcy friction factor depends on Reynolds number and  roughness 

LaTeX Math Inline
body\epsilon


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