Problem 13.3
[Difficulty: 2]
Given:
Steam flow through a nozzle
Find:
Speed and Mach number; Mass flow rate; Sketch the shape
Solution:
Basic
equations:
m
rate
ρ
V
A
h
1
V
1
2
2
h
2
V
2
2
2
Assumptions: 1) Steady flow 2) Isentropic 3) Uniform flow 4) Superheated steam can be treated as ideal gas
Given or available data
T
0
450
273
()
K
p
0
6 MPa
p
2 MPa
D2
c
m
k
1.30
R
461.4
J
kg K
(Table A.6)
From the steam tables (try finding interactive ones on the Web!), at stagnation conditions
s
0
6720
J
kg K
h
0
3.302
10
6
J
kg
Hence at the nozzle section
ss
0
6720
J
kg K
an
d
p
2 MPa
From these values we find from the steam tables that
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This note was uploaded on 01/20/2012 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear

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