Question

Water flows in a 350-mm-diameter pipe at the rate of 600 liters per second. The pipe has a length of 64 m. Compute the head loss:

Using Darcy-Weisbach formula with f =0.028.

Using Hazen-William’s formula with C1 = 92.

Using Manning’s formula with n = 0.012.

Answer #1

Water (T = 20°C, v = 1 × 10-6 m2 /s) flows at a rate of 0.2 m3
/s in a 50 cm concrete pipe (e = 0.3 mm). The pipe is 1500 m long.
Using Darcy-Weisbach equation, calculate the head loss in the
pipe?

A 400 mm diameter pipe, conveying water, branches into
two pipes of diameters 300 mm and 200mm respectively. If the
discharge in the 400 mm diameter pipe is 380L/s, compute the
average velocity in this pipe. If the average velocity in 300mm
diameter pipe is 200L/s, find the discharge and velocity head in
200mm diameter
pipe.

Water flows through 80 km of HDPE (High Density Polyethylene)
pipe having an outer diameter of 1600 mm and a wall thickness of 63
mm. If the volumetric flow is 75x106 metercube in a year, determine
the head loss in the pipe due to friction.Take kinematic viscosity
as ν = 1.33 X 10-6 m/s2

A 250 mm diameter of cast iron pipe flows 39.3 L/s of
SAE 10 oil along 500 m length. Given: dynamic viscosity, μ and
density, ρ of SAE 10 oil are 1.04 x 10-1 Ns/m2 and 917 kg/m3
respectively. By assuming the flow is laminar, determine energy
head and pressure loss due to pipe friction using Hagen-Poiseuille
equation and friction factor, f.

Blood flows at 0.0065 kg/s through an artery of diameter 8 mm
and length 350 mm. It enters the artery at 36.5°C and leaves it at
34.0°C. Calculate the rate of heat transfer from the blood, the
mean heat flux through the artery wall, and the mean velocity of
the blood. (Note: the thermophyhsical properties of blood may be
approximated by properties of liquid water at 37°C.)

Water flows between two reservoirs through 800 ft of 12-inch
diameter welded-steel pipe. The water surface elevation difference
between the two reservoirs is 16 ft. Find the flowrate (a) assuming
head loss is only due to pipe friction, and (b) Accounting for both
friction losses and minor losses due to a flush square-edged pipe
entrance, the pipe exit, and a half-open gate valve in the line.
Assume the water temperature is 60°F

Water flows between two reservoirs through 800 ft of 12-inch
diameter welded-steel pipe. The water surface elevation difference
between the two reservoirs is 16 ft.
Find the flowrate:
(a) assuming head loss is only due to pipe friction, and
(b) accounting for both friction losses and minor losses due to
a flush square-edged pipe entrance, the pipe exit, and a half-open
gate valve in the line. Assume the water temperature is 60°F.

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