Abstract
Pressure drops of fully-developed incompressible laminar newtonian flows in helical pipes of constant circular cross-section having a finite pitch are experimentally investigated. For the case of loosely coiled pipes of 0 <
η/λ
< 41.22,
f Re
(
f
is the Fanning friction factor and
Re
is the Reynolds number) is found to be proportional to the square root of the flow Dean number,
Dn = Re λ
½
. Here
λ
and
η
are the normalized curvature ratio and torsion which incorporate both the coil radius and its pitch. In all cases studied, the experimental results for
f Re
are in excellent agreement with the theoretical prediction of Liu & Masliyah.
Cited by
21 articles.
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