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Fully Developed Pipe Flow Equations
(Section 85,
Ç
engel and Cimbala)
There are several empirical equations available to use in place of the Moody chart. The
most important one (in fact, the equation with which the turbulent portion of the Moody
chart is drawn) is:
The Colebrook equation
Note: This is log
10
, not the natural log, ln.
Unfortunately, the Colebrook equation is implicit in
f
(since
f
appears on both sides of
the equation, and the equation must be solved by iteration. An approximation to the
Colebrook equation was created by Haaland, and is accurate to
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This note was uploaded on 07/23/2008 for the course ME 33 taught by Professor Cimbala during the Fall '05 term at Penn State.
 Fall '05
 CIMBALA

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