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Problem 4.84
[Difficulty: 2]
R
x
y
x
CS
V
e
Given:
Data on rocket motor
Find:
Thrust produced
Solution:
Basic equation: Momentum flux in x direction for the elbow
Assumptions:
1) Steady flow
2) Neglect change of momentum within CV 3) Uniform flow
Hence
R
x
p
eg
A
e
⋅
−
V
e
ρ
e
V
e
⋅
A
e
⋅
()
⋅
=
m
e
V
e
⋅
=
R
x
p
eg
A
e
⋅
m
e
V
e
⋅
+
=
where p
eg
is the exit pressure (gage), m
e
is the mass flow rate at the exit (software cannot render dot over m!) and V
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear
 Fluid Mechanics, Flux

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