A circular pipe of 25-mm outside diameter is placed in an airstream at 25°C and 1-atm pressure. The air moves in cross flow over the pipe at 15 m/s, while the outer surface of the pipe is maintained at 100°C. What is the drag force exerted on the pipe per unit length? What is the rate of heat transfer from the pipe per unit length?
Properties: Air (Tf = 335 K, 1 atm): = 19.31 106
m2
/s, = 1.048 kg/m3
, k = 0.0288 W/m K, Pr = 0.702.
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