Solve Problem 20.20 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. Problem 20.20 If the steam line described in Problem 20.40 is bare and...

Solve Problem 20.20 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.

Problem 20.20

If the steam line described in Problem 20.40 is bare and surrounded by still air at 70F, 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 70F.

Problem 20.40

Steam at 400 psi, 800F flows through a 1-in. schedule140 steel pipe at a rate of 10; 000 lb_m/h: Estimate the value of h that applies at the inside pipe surface.