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In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.
The Darcy friction factor is also known as the Darcy–Weisbach friction factor, ... a formula it is worth knowing that in the paper on the Moody chart, Moody stated ...
Which friction factor is plotted in a Moody diagram may be determined by inspection if the publisher did not include the formula described above: Observe the value of the friction factor for laminar flow at a Reynolds number of 1000. If the value of the friction factor is 0.064, then the Darcy friction factor is plotted in the Moody diagram.
This was originally produced to describe the Moody chart, which plots the Darcy-Weisbach Friction factor against Reynolds number. The Darcy Weisbach Formula f D {\displaystyle f_{D}} , also called Moody friction factor, is 4 times the Fanning friction factor f {\displaystyle f} and so a factor of 1 4 {\displaystyle {\frac {1}{4}}} has been ...
The experimentally measured values of f D are fit to reasonable accuracy by the (recursive) Colebrook–White equation, [12] depicted graphically in the Moody chart which plots friction factor f D versus Reynolds number Re for selected values of relative roughness ε / D.
Lewis Ferry Moody (5 January 1880 – 18 April 1953 [1]) was an American engineer and professor, best known for the Moody chart, a diagram capturing relationships between several variables used in calculating fluid flow through a pipe.
Moody’s Investors Service on Friday lowered its ratings outlook on the United States’ government to negative from stable, pointing to rising risks to the nation’s fiscal strength.
where f is the Darcy friction factor that can either be obtained from the Moody chart or for smooth tubes from correlation developed by Petukhov: [4]: 490 = ( ()) The Gnielinski Correlation is valid for: [4]: 490