Air flows through a 6-cm-diameter smooth pipe which has a 2 m-long perforated section containing 500 holes (diameter 1 mm), as in Fig. P6.147. Pressure outside the pipe is sea-level standard air. If p1 = 105 kPa and Q1 = 110 m3/h, estimate p2 and Q2, assuming that the holes are approximated by thin-plate orifices. Hint: A momentum control volume may be very useful.

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500 holes (diameter 1 mm) 00000000000% 10 2 m