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Q4. Steam at a pressure of 20 bar and a specific volume of 0.1511 m³/kg enters a convergent divergent nozzle with a negligible velocity.

The steam expands isentropically according to taw pV^1.3 = constant into a space at a pressure of 3 bar.

The diameter of the throat is 10 mm and the specific enthalpy drop in the divergent section is 295.5 kJ/kg.

Calculate EACH of the following:

(a) the critical pressure; (2)

(b) the specific volume of the steam at the throat; (3)

(c) the mass flow rate of steam; (5)

(d) the diameter of the nozzle at exit. (6)

Note: For the nozzle p_c = p_o (2/(n+1))^n/n-1 ; C_c  = (np_c V_c )^1/2