Answered: Water at 80◦C flows steadily from a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Water at 80◦C flows steadily from a tank shown below at a volume flow rate of 475 L/min to a pump through
a 62.7-mm diameter steel pipe. The roughness element size is 46 μm. The kinematic viscosity of water is
ν = μ/ρ = 3.60 × 10−7 m2/s. The tank is open to the air through a hole shown in the figure. If needed, use
the table and the Moody chart on the next page.

(a) What is the pressure at the pump inlet?
(b) It is desired to increase the pressure at the inlet of the pump while keeping the volume flow rate constant.
If that is the only design constraint, what changes can be made to the existing system to achieve the
new design goal? List at least three suggestions.

4. Water at 80°C flows steadily from a tank shown below at a volume flow rate of 475 L/min to a pump through
a 62.7-mm diameter steel pipe. The roughness element size is 46 µm. The kinematic viscosity of water is
v=μ/p=3.60 x 10-7 m²/s. The tank is open to the air through a hole shown in the figure. If needed, use
the table and the Moody chart on the next page.
(a) What is the pressure at the pump inlet?
(b) It is desired to increase the pressure at the inlet of the pump while keeping the volume flow rate constant.
If that is the only design constraint, what changes can be made to the existing system to achieve the
new design goal? List at least three suggestions.
0.75 m
1.40m
Flow
115m
Globe valve
fully open
-DN 65 Schedule 40 steel pipe
Standard elbows (2)
Pump

Friction Factor
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.015
0.01
Laminar Flow
64
Material
Concrete, coarse
Concrete, new smooth
Drawn tubing
Glass, Plastic Perspex
Iron, cast
Sewers, old
Steel, mortar lined.
Steel, rusted
€ (mm)
0.25
0.025
0.0025
0.0025
0.15
3.0
0.1
0.5
Steel, structural or forged 0.025
Water mains, old
1.0
10³
104
Moody Diagram
Transition Region
Complete Turbulence;
Friction Factor =
105
VAP.
106
Reynolds Number, Re=
pVd
μl
Smooth Pipe
107
0.05
0.04
0.03
0.02
0.015
0.01
0.005
0.002
0.001
5x10-4
2x10-4
10-4
5x10-5
10-5
5x10-6
10-6
108
Relative Pipe Roughness

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