Question

Water flows through a 100 mm diameter pipe with a velocity of 0.015 m/sec. If the kinematic viscosity of water is $1.13\times {10}^{-6}{m}^2/sec$, the friction factor of the pipe material is

• A. 0.0015
• B. 0.032
• C. 0.037
• D. 0.048

Answer 1

The correct option is D 0.048

Reynolds number,
$Re=\frac{VD}{v}=\frac{0.015\times 100\times {10}^{-3}}{1.13\times {10}^{-6}}$
$=1327.43<2000$
Hence flow is laminar
$\therefore$ $f=\frac{64}{Re}=\frac{64}{1327.43}=0.048$