Question: Air at 300 K flows through a duct 50 m long with f = 0.019 . What is the minimum duct diameter which can carry

Air at 300 K flows through a duct 50 m long with f = 0.019 . What is the minimum duct diameter which can carry the flow without choking if the entrance velocity is
(a) 50 m/s,
(b) 150 m/s, and
(c) 420 m/s?

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