55. Water substance at 70 bar and 65°C enters a boiler tube of constant inside diameter of 25

mm. The water leaves the boiler tube at 50 bar and 700 K at velocity of 150 m/s. Calculate the

inlet velocity (m/s).

From steam tables:

@ 70 bar (7Mpa) and 65°C: υ1 = 0.001017 m3

/kg

@ 50 bar (5Mpa) and 700 K (427°C): υ2 = 0.06081 m3

/kg

A. 1.56

B. 2.51

C. 1.672

D. 3.230