Steam Nozzle
Unit-2 Subject : Applied Thermodynamics : Question bank Steam Nozzle-(Theory)
1 2 3 4 5 6 7 8 1 What is steam nozzle? Why it is convergent divergent? What assumptions are adopted in analyzing flow through nozzle? Explain the significance of critical pressure ratio. What is the steady flow energy equation of nozzle? Explain its use in calculating the steam velocity at exit? Why the divergent portion of nozzle is necessary? Define nozzle efficiency. What is the effect of friction in nozzle Explain the physical concept of critical pressure ratio Explain supersaturated flow through nozzle & Wilson line? What is the metastable expansion of steam in nozzle? Explain with the help of H-S diagram.
Nozzle Problems(General)
A steam is supplied at 7 bar and 2750C.The divergent portion is 50mm long and throat diameter is 5 mm .Find the cone angle of divergent portion so that steam may leave the nozzle at 1 bar. Loss in the nozzle is 12% in divergent portion only. Determine velocity and temperature at throat. Steam at a pressure of 10 bar and dryness fraction of 0.98 is discharges through convergent divergent nozzle to a back pressure a 0.1 bar. The mass flow rate is 10 kg/kW h. If power developed is 200 kW. Determine (1) Pressure at throat (2) Number of nozzle required if throat section is rectangular 5 mm x 10 mm.(3) the cross section (with same aspect ratio at throat) at exit if the 10% enthalpy loss is in divergent part only. A steam nozzle supplied a steam at 15 bar and 350 0 C. and discharges at 1 bar. The divergent portion of nozzle is 80 mm long and throat diameter is 6 mm. Determine the cone angle of divergent portion. Assume 12% of total enthalpy is lost in friction in divergent portion. Also determine the velocity and condition of steam at throat. A convergent-divergent nozzle is supplied a steam at 10 bar and 2700C.The divergent portion is 3.2 cm long and throat diameter is 6 mm .Find the semi cone angle of divergent portion so that steam may leave the nozzle at 1.2
1 2 3 4 5 6 7 8 1 What is steam nozzle? Why it is convergent divergent? What assumptions are adopted in analyzing flow through nozzle? Explain the significance of critical pressure ratio. What is the steady flow energy equation of nozzle? Explain its use in calculating the steam velocity at exit? Why the divergent portion of nozzle is necessary? Define nozzle efficiency. What is the effect of friction in nozzle Explain the physical concept of critical pressure ratio Explain supersaturated flow through nozzle & Wilson line? What is the metastable expansion of steam in nozzle? Explain with the help of H-S diagram.
Nozzle Problems(General)
A steam is supplied at 7 bar and 2750C.The divergent portion is 50mm long and throat diameter is 5 mm .Find the cone angle of divergent portion so that steam may leave the nozzle at 1 bar. Loss in the nozzle is 12% in divergent portion only. Determine velocity and temperature at throat. Steam at a pressure of 10 bar and dryness fraction of 0.98 is discharges through convergent divergent nozzle to a back pressure a 0.1 bar. The mass flow rate is 10 kg/kW h. If power developed is 200 kW. Determine (1) Pressure at throat (2) Number of nozzle required if throat section is rectangular 5 mm x 10 mm.(3) the cross section (with same aspect ratio at throat) at exit if the 10% enthalpy loss is in divergent part only. A steam nozzle supplied a steam at 15 bar and 350 0 C. and discharges at 1 bar. The divergent portion of nozzle is 80 mm long and throat diameter is 6 mm. Determine the cone angle of divergent portion. Assume 12% of total enthalpy is lost in friction in divergent portion. Also determine the velocity and condition of steam at throat. A convergent-divergent nozzle is supplied a steam at 10 bar and 2700C.The divergent portion is 3.2 cm long and throat diameter is 6 mm .Find the semi cone angle of divergent portion so that steam may leave the nozzle at 1.2