Solve Problem 20.18 if the bare pipe is located so that 295 K air flows normal to the pipe axis at a velocity of 6.5 m/s.

Data From Problem 20.18

If the steam line described in Problem 20.40 is bare and surrounded by still air at 70°F, what total heat transfer would be predicted from a 20-ft length of bare pipe? Consider the bare pipe to be a black surface and the surroundings black at 70°F.