Air is flowing from a reservoir through a long, insulated, isentropic nozzle. The pressure and temperature at the reservoir are 15 atm and 950 K, respectively. The Mach number at the entrance of the pipe is 0.05. Determine the maximum allowable length of the pipe. Assume that the inside of the pipe is smooth.

Q: 125 mm 150 mm 125 mm 125 mm 300 mm 125 mm 2 m 35 KN/m 5m 20 KN 3 m

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A: ∑MB=0RA×8=100×6+12×60×3×2+23RA=108.75kNRA+RB=100+12×3×60RB=81.25N

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?