Saturated steam at 30°C condenses on the outside of a 4-cm-outer-diameter, 2-m-long vertical tube. The temperature of the tube is maintained at 20°C by the cooling water. Determine

(a) The rate of heat transfer from the steam to the cooling water,

(b) The rate of condensation of steam,

(c) The approximate thickness of the liquid film at the bottom of the tube. Assume wavy-laminar flow and that the tube diameter is large, relative to the thickness of the liquid film at the bottom of the tube. Are these good assumptions?

Transcribed Image Text:

Condensate 20°C 4 cm Steam 30°C L = 2 m