Section: Fluid Mechanics | Type: NAT | Marks: 2
The skin friction coefficient for a turbulent pipe flow is defined as, 2 1 2 w f C V τ ρ = , where w τ is the wall shear stress and V is the average flow velocity. The value of f C is empirically given by the relation: f C = ( ) 0.25 2 0.065 Re , where Re is the Reynolds number. If the average flow velocity is 10 m/s, diameter of the pipe is 250 mm, kinematic viscosity of the fluid is 0.25×10−6 m2/s, and density of the fluid is 700 kg/m3, the skin friction drag induced by the flow over 1 m length of the pipe, in N, is ___________.
Answer: 30 to 45