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The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?

/ Fluid Mechanics for Chemical / By
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?

A. 4(Ro-Ri)
B. √(Ro-Ri)
C. 2(Ro-Ri)
D. Ro + Ri