Fluid Mechanics
8th Edition
ISBN: 9780073398273
Author: Frank M. White
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 1, Problem 1.13P
The efficiency ? of a pump is defined as the (dimension-less) ratio of the power developed by the flow to the power required to drive the pump:
where Q is the volume rate of flow and
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Q2. Assume the pump has the performance plotted in Figure Q7
Efficiency (%)
100
80
60
40
20
C
Total head (ft)
200,60
45
150
Head
100 30
50 15
0
0
Efficiency
500
2000
Power
1000
4000
1500
2000
kW
60
45
30
15
2500 (gal/min)
8000 10000 (l/min)
hp
80
T
T
60
40
20
6000
Pump capacity
Figure Q2
Assume the pump was operating at a rotational speed of 1750 rpm for water y = 9810 N/m^3 and that
the impeller diameter was 330 mm. The power required for this pump is 37 KW and the total head is 40
m. find the performance of pump at a speed of 1250 rpm. Where 1 m^3-1000 L.
Power
A centrifugal pump operating under steady flow conditions delivers 2285 kg/min of water from an
initial pressure of 82720 Pa to a final pressure of 275840 Pa. The diameter of the inlet pipe to the
pump is 15.20 cm and the diameter of the discharge pipe is 10.5cm. What is the work in kW?
[Pwater=1000 kg/m³]
2.
A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second?
The correct answer has a margin of 1 from exact answer. Velocity head is neglected.
Chapter 1 Solutions
Fluid Mechanics
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C1.8 A mechanical device that uses the rotating...Ch. 1 - Prob. 1.9CPCh. 1 - A popular gravity-driven instrument is the...Ch. 1 - Mott [Ref. 49, p. 38] discusses a simple...Ch. 1 - A solid aluminum disk (SG = 2.7) is 2 in in...
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