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Steam flows through a nozzle at mass flow rate of m = 0.1 kg/s with a heat loss of 5 kW. The enthalpies at inlet and exit are 2500 kJ/kg and 2350 kJ/kg, respectively. Assuming negliglble velocty at inlet (C1~ 0), the velocity (C2) of steam (in m/s) at the nozzle exit is _______(correct to two deeimal places)
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- 4471m/s
- 444.213 m/s
- 357.213 m/s
- 447.213 m/s
Correct Option: D
m 0.1 kg/ s, Q 5 kW (heat loss)
Applying SFEE
ṁ | ![]() | h1 + | C²1 + gz1 | ![]() | + Q̇ = ṁ | ![]() | h2 + | C²2 + gz2 | ![]() | + ẆCV | ||
2 | 2 |
C1 = 0 and ẆCV = 0
z1 = z2(assume)
ṁh1 + Q = ṁh2 + ṁ1/2 C²2
⇒ ṁ × | C²2 = ṁ(h1 - h2) + Q̇ | |
2 |
C2 = 447.213 m/s