High Quality Content by WIKIPEDIA articles! 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. Definition: D_H = frac {4A}{P} where A is the cross sectional area and P is the wetted perimeter of the cross-section. For a round tube, this checks as: D_H = frac{4 frac {pi D^2}{4}}{pi D} = D

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