The flow of water (mass density = 1000 kg/m 3 and kinematic viscosity = 10 -6 m 2 /s) in a commercial pipe, having equivalent roughness k s as 0.12 mm, yields an average shear stress at the pipe boundary = 600 N/m 2 . The value of k s /?' (?' being the thickness of laminar sub-layer) for this pipe is

The flow of water (mass density = 1000 kg/m 3 and kinematic viscosity

1.	The flow of water (mass density = 1000 kg/m 3 and kinematic viscosity = 10 -6 m 2 /s) in a commercial pipe, having equivalent roughness k s as 0.12 mm, yields an average shear stress at the pipe boundary = 600 N/m 2 . The value of k s /?' (?' being the thickness of laminar sub-layer) for this pipe is
A.	0.25
B.	0.50
C.	6.0
D.	8.0
Answer» E.

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