Hydraulic diameter
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The hydraulic diameter, <math> D_h <math>, 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:
<math> D_h = \frac {4A}{U} <math>
where A is the cross-sectional area and U is the wetted perimeter of the cross-section.
For a round tube, this checks as:
<math> D_h = \frac{\frac {4 \pi D^2}{4}}{\pi D} = D <math>
External links
- Heat exchanger calculations: Hydraulic Diameter (http://www.livstek.lth.se/People_list/ulfb/b13_heat.htm)