Question 5.18: (a) Justify the statement ‘‘Nozzles are more efficient than ...
(a) Justify the statement ‘‘Nozzles are more efficient than diffusers’’.
(b) Derive the following expression for nozzle flow :
\frac{dA}{A} = \frac{1}{γ} \frac{dp}{p} (\frac{1 – M²}{M²}), the symbols having usual meanings.
(c) It is proposed to design steam nozzles for the following data :
Initial pressure = 30 bar
Initial temperature = 450°C
Back pressure = 6 bar
Nozzle efficiency = 90%
Initial steam velocity = 60 m/s
Mass flow rate = 2 kg/s
Assuming circular cross-section, calculate the inlet, throat and exit diameter of nozzle. (AMIE)
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