Air free saturated steam at T s = 65 C condenses on the surface of a vertical tube with on OD of 2.5 cm which is maintained at a uniform temperature of 35ºC. Determine the tube length L for a...

Air free saturated steam at T_s
= 65C condenses on the surface of a vertical tube with on OD of 2.5 cm which is maintained at a uniform temperature of 35ºC. Determine the tube length L for a condensate flow rate of 6
 10^–3
kg/s per tube.

Hints: Properties of water at T_f
= 50ºC are the same as in the previous examples. Find

to prove that the condensate flow is laminar. Use Eq. (6.34) to find h_m
increased by 20% as recommended by McAdams.