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The hydraulic diameter, Dh, is a 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.
where A is the cross sectional area and U is the wetted perimeter of the cross-section.
For a round tube, this checks as:
For an annulus the hydraulic diameter is
For the special case of a square duct, where L = W, then Dh = L . For the other limiting case of a very wide duct, i.e. a slot of width W where , then Dh = 2W.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydraulic_diameter". A list of authors is available in Wikipedia.|