CE 403 Optional FE Review:
Fluid mechanics
Chris Rehmann
Fluid mechanics
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Flow measurement
Fluid properties
Fluid statics
Energy, impulse, and momentum equations
Pipe and other internal flow
Fluid statics: USF question 7.1
Fluid statics: USF question 7.3
Hydrostatics: Çengel & Cimbala #4.1
Hydrostatics: Ç&C #5.1
Flow rate: USF question 7.4
Flow rate: Ç&C #6.2
A 4-cm diameter jet is supplied by a 7-cm
diameter pipe with a flow of 160 gpm. What is
the average velocity in the supply line?
a.
b.
c.
d.
0.84 m/s
1.53 m/s
2.62 m/s
8.04 m/s
Cons. of mass: USF question 7.2
Conservation of mass
A tank open at the top has constant inflow and
outflow. If the initial depth is 3 m, when will the
depth be 1 m? Take V1 = 0.5 m/s, D1 = 0.05 m, V2 =
1 m/s, D2 = 0.5 m, H = 5 m, and At = 1 m2.
a.
b.
c.
d.
132 sec
291 sec
342 sec
456 sec
V1
H
Area At
V2
White prob. FE 3.5: Cons. of momentum
A jet of water 3 cm in diameter strikes normal to
a vertical plate. If the force required to hold the
plate is 23 N, what is the jet velocity?
a.
b.
c.
d.
2.85 m/s
5.7 m/s
8.1 m/s
23 m/s
Bernoulli: Ç&C #7.1
4.81 m/s
Bernoulli: Ç&C #8.1
Flow measurement: Ç&C #14.2
I get 1864 Pa using the FE review manual.
Dimensionless parameters: Ç&C #15.2
A 12-cm diameter sphere is in water of density 998
kg/m3 and dynamic viscosity of 10-3 N s/m2. The
velocity is 6 m/s. What is the Reynolds number?
a.
b.
c.
d.
720
7.2 x 105
7.2 x 10-7
7.2 x 106
Dimensionless parameters: Ç&C #11.2
Dimensionless parameters: Ç&C #1.3
Dimensionless parameters: Ç&C #12.1
Similitude: Ç&C #10.1
Laminar flow: Ç&C #3.1
Incompressible & irrotational flow: Ç&C #9.1
incompressible
Incompressible: u  v  0
x
y
Drag: Ç&C #16.2
Pipe flow: Ç&C #13.1
Pipe flow: White #FE6.6
A smooth 8-cm-diameter pipe, 200 m long, connects two
reservoirs, containing water at 20°C, one of which has a surface
elevation of 700 m and the other with its surface elevation at 560
m. If minor losses are neglected, the expected flow rate through
the pipe is
a.
b.
c.
d.
e.
0.048 m3/h
2.87 m3/h
134 m3/h
172 m3/h
385 m3/h
Open channel flow: Ç&C #20.2
Open channel flow: White #FE10.5
Consider an open rectangular channel 3 m wide laid on a 1° slope.
If Manning’s roughness factor is 0.02 and the flow is 29 m3/s, what
is the normal depth?
a.
b.
c.
d.
e.
1m
1.5 m
2m
2.5 m
3m
Open channel flow: White #FE10.6
Consider an open rectangular channel 3 m wide laid on a 1° slope.
If Manning’s roughness factor is 0.02 and the flow is 29 m3/s, what
is the critical depth?
a.
b.
c.
d.
e.
1m
1.26 m
1.5 m
1.87 m
2.0 m