Hydraulic diameter



         


The hydraulic diameter Dh is commonly used term when handling flow in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube.

Definition:

Dh = 4A/U,

where A is the cross-sectional area and U is the wetted perimeter of the cross-section.

For a round tube, this checks as

Dh = (4;pi;D2/4)/(pi;D) = D.
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