turbulent flows and is known as
Darcy - Weisbach
formula.
It is found that friction factor depends on
–
density of the fluid,
ρ
–
velocity of the flow, v
–
diameter of the pipe, d
–
viscosity of the fluid,
µ
–
wall roughness,
ε
ε
wall roughness
i.e.
f = f(
ρ
, v, d,
µ
,
ε
)
By dimensional analysis,
f
= f
ρ
µ
ε
vd
d
,
⎛
⎝
⎜
⎞
⎠
⎟
= f ( Reynolds number, relative roughness)
where
Reynolds number =
µ
ρ
vd
and
relative roughness =
ε
d
(7.15)

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