A steam of air flows in an insulated tube of constant cross-sectional area of 0.9 m2. At a section 1, the pressure is 0.6 bar, temperature is 220C and mass velocity is 150 kg/s-m2. The pressure in space in which tube exhausts is so low that choking condition prevails.
Determine,
- Match no. at section 1.
- Mach no, temperature and pressure at the exit of tube.
- Total force exerted in axial direction which must be exerted to hold the tube stationary.
Given, R = 287 J/kg-K ; $\gamma$ = 1.4
Fanno line (adiabatic constant area flow with friction) table $\gamma$ = 1.4
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M
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 $\frac{T}{T^{*}}$
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 $\frac{e}{e^{*}}$
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$\frac{P}{P^{*}}$
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 $\frac{Po}{Po^{*}}$
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 $\frac{I}{I^{*}}$
|
 $\frac{4fL_{max}}{D}$
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|
0.58
|
1.124
|
0.615
|
1.828
|
1.213
|
1.121
|
0.576
|
|
0.60
|
1.119
|
0.635
|
1.763
|
1.188
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1.105
|
0.491
|
|
0.62
|
1.114
|
0.654
|
1.703
|
1.166
|
1.091
|
0.417
|
|
0.64
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1.109
|
0.674
|
1.646
|
1.145
|
1.079
|
0.353
|