Question: Water at 20 o C flows through a concentric annulus of inner diameter D1 = 2.0 cm and outer diameter D2 = 4.0 cm. The

Water at 20 o C flows through a concentric annulus of inner diameter D1 = 2.0 cm and outer diameter D2 = 4.0 cm. The surface roughness is 0.0002 cm. Calculate the fictional pressure loss per unit length for a flowrate of 0.01 m3 /s.

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