Discussion of flow in pipes has been restricted to pipes of circular cross section.
FLOW IN TUBES IN NONCIRCULAR
CROSS SECTION
Discussion
of flow in pipes has been restricted to pipes of circular cross section. The
previous exposition may be applied to turbulent flow in noncircular ducts by
introducing a dimension equivalent to the diameter of a circular pipe. This is
known as the mean hydraulic diameter, dm, which is defined as four
times the cross-sectional area divided by the wetted perimeter. A few examples
are as follows:
For
a square channel of side b,
For
an annulus of outer radius r1 and inner radius r2,
This
simple modification does not apply to laminar flow in noncircular ducts.
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