Question

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 negligible velocity at inlet (C1≈0) ,  the velocity (C2)  of steam (in m/s) at the nozzle exit is _________ (correct to two decimal places) 

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Answer :

447.21

ṁ = 0.10 kg/s, Q = 5 kW (heat loss)

Applying SFEE

ṁ(h1+c12/2 + gz1) + 

ṁ(h2+c22/2 + gz2) + cv

c1 = 0 and cv = 0

z1 =  z2 ( assume )

ṁh1 + Q̇ = ṁh2 + ṁc22/2

ṁ*c22/2 = ṁ(h1-h2) + Q̇

0.1*c22/2*10-3= 0.1(2500-2350) -5

c2 = 447.213 m/s




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