Abstract
C, a numerical coefficient , defined, as F
d
/8
μv
representing the increase of resistance due to curvature,
d
, diameter of pipe. D, mean diameter of coil.
d
/D, curvature ratio. F, intensity of frictional drag on wall of pipe,
i. e
., shear stress at boundary,
g
, gravitational acceleration,
m
, hydraulic mean depth, = area/perimeter,
v
, mean velocity of flow, = volume flowing per unit time/cross sectional area of pipe,
ρ
, density of fluid,
μ
viscosity of fluid. All the values given in the paper are dimensionless, except in those cases in which some dimension is specifically stated.
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