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questions from practice exam 2

# questions from practice exam 2 - Consider air flowing...

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8/13/11 Consider air flowing through a circular, thin walled, pipe of diameter 5 cm and length 3 m. Air enters the pipe at a velocity of 0.75 m/s and a temperature of 25°C, which is uniformly heated at a rate of 100 W/m2. Determine the maximum surface temperature and the location where it occurs. The air properties may be assumed constant: Density 0.995 kg/m3 Cp 1009 J/kg-K Viscosity (±) 2.08 x 10-5 N-s/m2 Kinematic Viscosity (± ) 2.09x10-5 m2/s Thermal conductivity (k) 0.03 W/m-K Thermal diffusivity (± ) 3 x 10-5 m2/s Pr 0.700 Volumetric Expansion Coefficient ( f) 0.003 K-1

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8/13/11 Consider air flowing through a circular, thin walled, pipe of diameter 5 cm and length 3 m. Air enters the pipe at a velocity of 0.75 m/s and a temperature of 25°C, which is uniformly heated at a rate of 100 W/m2. Determine the maximum surface temperature and the location where it occurs.
8/13/11 Consider air flowing through a circular, thin walled, pipe of diameter 5 cm and length 3 m. Air enters the pipe at a velocity of 0.75 m/s and a temperature of 25°C, which is uniformly heated at a rate of 100 W/m2. Determine the maximum surface temperature and the location where it occurs.

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