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Air flows into a commercial steel pipe of 5 cm ID at 70 m/s. The inlet...

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Mechanical Engineering

Air flows into a commercial steel pipe of 5 cm ID at 70 m/s.The inlet pressure and temperature of the air are 1 MPa and 100?C,respectively.
a) Determine the Mach number at a distance 60 m down the pipeif the flow is adiabatic.
b) Calculate the temperature at the same point. How would youcomment on the assumption of
constant Re, hence constant f, along the pipe by consideringthe temperature variation?

Answer & Explanation Solved by verified expert
4.4 Ratings (824 Votes)
aAt 100 deg C Air kinematic viscosity 2297106 m2sReynolds number Re VD 70 005 2297106Re 152105For commercial steel pipe roughness 0046 mmRelative roughness 0046 D 0046 50 000092From Moody diagram for Re 152105 and    See Answer
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