hydraulic diameter

The hydraulic diameter, $D_h$ , 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:

D_h = \frac {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:

D_h = \frac{\frac {4 \pi D^2}{4}}{\pi D} = D

External links

*Heat exchanger calculations: Hydraulic Diameter

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