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
Flow may refer to:
Science and technology
* Fluid flow, the motion of a gas or liquid
* Flow (geomorphology), a type of mass wasting or slope movement in geomorphology
* Flow (mathematics), a group action of the real numbers on a set
* Flow (psych ...
in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.
History
In 1944,
Lewis Ferry Moody
Lewis Ferry Moody (5 January 1880 – 21 February 1953) 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. He has 23 ...
plotted the
Darcy–Weisbach friction factor against
Reynolds number Re for various values of relative
roughness ε / ''D''.
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