Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Textbook Question
Chapter 10, Problem 47P
A centrifugal pump is installed in a piping system with L = 300 m of D = 40 cm cast-iron pipe. The downstream reservoir surface is 15 m lower than the upstream reservoir. Determine and plot the system head curve. Find the volume flow rate (magnitude and direction) through the system when the pump is not operating. Estimate the friction loss, power requirement, and hourly energy cost to pump water at 1 m3/s through this system.
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A pump draws 24 li/s of water from the lower reservoir and lifts it to upper reservoir. The head lossfrom the inlet 150 mm pipe diameter is three times the velocity head and the head loss going to theoutlet 100mm pipe diameter is 25 times its velocity head. What is the power generated by the pump tothe system in horsepower. (Note: Velocities from the reservoir are different from the velocities of thepipe and pleaseee draw a diagram if you can thank you so much)
A pump is required to transfer water at the rate of 350 kg/s from an open sump to an open storage tank located 30m above the pump. The sucLon pipe is 350mm in diameter and 12m in length and the delivery pipe is 550mm in diameter and 40m in length. Calculate:(a) The maximum height at which the pump may be placed above the sump, so that pressure at the inlet is not less than -80 kPa (gauge) (b) the energy to be supplied by the pump per unit mass of water transferred (c) The input power required by the pump, which is 60 % efficient
Еxample4
A centrifugal pump is used to raise the water from the river to the reservoir,
find:
1) total dynamic head.
2) water power, pump power and motor power.
3) monthly cost pump operation, if power cost is 4 cents and pump operates 20
hr/day.
If:-
1- Q = 1.9 m/min
2- Elevation between the reservoir and the pump is 25 m and the length of the pipe is 365 m
3- Diameter of suction lift and discharge pipes 200 mm and length of suction lift is 10 m.
4- Barometric pressure is 88 Kpa, vapor pressure 2.5 Kpa
5- NPSH),eg = 40 Kpa
6- Efficiency of pump and motor is 80%.
Treq
7- Neglect minor losses
8- Use f = 0.02, X= 10 Kn/m3
Chapter 10 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
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