FLUID MECHANICS FUND. (LL)-W/ACCESS
4th Edition
ISBN: 9781266016042
Author: CENGEL
Publisher: MCG CUSTOM
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Chapter 5, Problem 87P
Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.5-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kPa (gage) in the tank. If the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the rooftop.
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Problem 3. A pump is installed in a 250-m-long pipeline to raise water (v = 1 x 10-6 m²/s)
55 m from a reservoir to an elevated tank. The pipe is ductile iron with a diameter of 80
cm and a flow rate of 2.19 m³/s. The pump is placed outside the supply reservoir with a
centerline elevation of 1.5 m below the reservoir water surface. Determine the maximum
distance, Lmax, in meters that the pump could be installed away from the supply reservoir
(the allowable length of the suction line) without encountering cavitation problems. The
required net-positive suction head is NPSH = 4.75 m and the water is at 30° C.
Total minor losses for the entire pipeline are 17.8 times the velocity head, including exit loss.
Minor losses in the suction line are 5.0 times the velocity head. Use an atmospheric pressure
of 101.0 kPa.
Lmax
1.50 m
80 cm diameter
P
Water in an enclosed tank is subjected to a gauge pressure of 2 x 10 Pa, appied by a
compressed air introduced into the top of the tank. There is a small hole (diameter = 4 cm) in the
side of the tank 5 m below the level of the water. Calculate the discharge rate.
Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.5-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kPa (gage) in the tank. If the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top. Ans: 0.00986 m3/s or 9.86L/s
Chapter 5 Solutions
FLUID MECHANICS FUND. (LL)-W/ACCESS
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