Question

Steam enters an adiabatic nozzle at 400 °C and 800 kPa with a velocity of 16 m/s. It leaves the nozzle at 300 °C and 400 kPa. The inlet area of the nozzle is 800 cm2. Determine; a. The mass flow rate through the nozzle, in kg/s Ans. _kg/s b. The volume flow rate of the steam at the exit, in m3/s Ans._ _m3/s The velocity of the steam at the nozzle exit, in c. m/s Ans. m/s

Answer 1

According to the data given in the question,

Further useful data is taken from the STEAM TABLES,

Given, Pi=800 kPa Ti = 400°C V;= 30 /s A1 = 800cm? P2=400kPa Tz = 300°C Properties of steam at rnlet & exit P, = 800 kPa ? " = 0.384 m²/kg Ti - 400C 5 h, = 3267.56 kJ/kg P₂ = 400kPa ? TZ - 300°C J V = 0.655 m3/kg hz = 3067 kJ/kg (a) Mass flow rate of steam (m): M . AM - .284 (03) (50) m = 6.25 kg/8] (C) Exit Velocity (%) myx :- According to energy conservation, Ein = Eout 0

=> 3267.56+ (59* (athy ) = 5P8 5067 + 167/69) + 250 3267.56 + (30* - 3067 + Vein V = 634 m/s 2000 2000 66) Volume flow rate at exit v = nie vz = (6.25) (0.655) = 4.1 m) V = 4.1 mm