Agriculture Reference
In-Depth Information
Fig. 1.12
Moody diagram
where
f
f
is the Fanning friction factor.
From the above equation, it is observed that Darcy's friction coefficient is four
times greater than Fanning's friction factor. So, care should be taken in selecting
friction coefficient, whether it is for Darcy-Weisbach formula
or
for others.
Head Loss Under Laminar Flow - Hagen-Poiseuille Equation
32
VL
wD
2
μ
h
f
=
(1.23)
where
V
=
velocity of flow (m/s)
L
=
length of pipe (m)
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