Water having kinematic viscosity v=0.00013 m2/s flows in a 100-mm-diameter pipe at a velocity of 1.5 m/s. Is the flow laminar or turbulent?

Oil of specific gravity 0.81 flows in a 250mm diameter pipe. Find the critical velocity. Use μ=8.14 x 10-2 Pa-s.

Determine the shear stress at the walls of a 300mm diameter pipe when water flowing causes a head lost of 5m in 90m pipe length.

Water flow at the rate of 200 lit/sec through 120m horizontal pipe having a diameter of 300mm. If the pressure difference between the end points is 280 mmHg, determine the friction factor.

Water flows from a tank through 160 feet of 4 inches diameter pipe and then discharges into air as shown in the figure. The flow of water in the pipe is 12 cfs. Assume n=0.013 and neglect minor losses. Determine the total head lost in the pipe in feet.

A pump draws 25 lit/sec of water from reservoir A to reservoir B as shown. Assuming f=0.02 for all pipes, compute the horsepower delivered by the pump.

For a 250mm diameter concrete pipe 3,500 m long, find the diameter of a 300m long equivalent pipe. Assume the friction factor f be the same for both pipes.

Two pipes 1 and 2 having the same length and diameter are in parallel. If the flow in pipe 1 is 750 lit/sec, what is the flow in pipe 2 if the friction factor f of the second pipe is twice that of the first pipe?

Two pipes are in series. If the coefficient of roughness n2=2n1 and the diameter D1 = 550mm, find the diameter D2 if the slope of their energy grade lines are the same.