Darcy Friction Factor
The
Darcy friction factor
is a
dimensionless number
used in internal flow calculations. It expresses the linear relationship between mean flow
velocity
and
pressure gradient
. It is defined as:
f = \frac{(\frac{-d p*}{d x}) D_h}{0.5 \rho V^2}
where:
\frac{-d p*}{d x}
is the pressure drop per unit length
D_h
is the
hydraulic diameter
ρ
is the fluid
density
V
is the
bulk velocity
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