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Q4. Steam flows through a bank of 20 identical convergent divergent nozzles at the rate of 10 kg/s.

The steam enters each nozzle at 16 bar 400℃ with a negligible velocity and expands to an exit pressure of 3 bar.

Expansion in the convergent section is isentropic, whilst in the divergent section the specific entropy increases by 1%.

The nozzles are choked and at this condition, the critical pressure ratio is 0.5625.

Calculate EACH of the following:

(a) the degree of superheat of the steam at the throat; (5)

(b) the throat diameter of each nozzle; (5)

(c) the degree of superheat of the steam at exit; (3)

(d) the exit velocity. (3)