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ME 30900
⎯
Fluid Mechanics
⎯
Fall 2011
Homework 9 (Due Wednesday, October 26, 2011)
Problem 1
A pump draws water at a steady flow rate of 8 L/s through a piping system. The pressure on the suction
side of the pump is 20 kPa (gage pressure). The pump outlet pressure is 350 kPa (gage pressure).
The inlet pipe diameter is 8 cm, and the outlet pipe diameter is 5 cm. If the pump is 80% efficient,
calculate the power required to drive in pump.
Solution
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It rains during the construction of a building and water fills a recently excavated pit to a depth
h
=0.5 m. In
order to continue construction, the water must be pumped out of the pit. A hose with a length of
L
=50m, a
diameter of
D
=2.5 10
2
m2 and a surface roughness of
e
=5.0 10
5
m is attached to a pump. Note that the
kinematic viscosity of the water is n = 1.005 10
6
m
2
/s and the density is 1000 kg/m
3
.
1.
If the pump is placed at the pit’s surface (figure a), what is the maximum depth of the pit,
H
, for
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This note was uploaded on 02/13/2012 for the course ME 309 taught by Professor Merkle during the Fall '08 term at Purdue UniversityWest Lafayette.
 Fall '08
 MERKLE

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