t = 0: 200° C 300 kPa 3 m3 (1) Pa= 100 kPa
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Air, from a 3 cubic meter tank initially at 300 kPa and
200°C, blows down adiabatically through a smooth pipe
1 cm in diameter and 2.5 m long. Estimate the time required
to reduce the tank pressure to 200 kPa. For simplicity,
assume constant tank temperature and f ≈ 0.020.
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