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The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?

/ Fluid Mechanics for Chemical / By
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?

A. √(HW/π)
B. HW/2 (H + W)2
C. HW/4 (H + W)2
D. 2HW/(H + W)