Determine the average heat transfer coefficient and the total condensation rate for problem 6.2 when the tube is horizontal. problem 6.2 Air-free saturated steam at 65°C condenses on the outer surface...

Determine the average heat transfer coefficient and the total condensation rate for problem 6.2 when the tube is horizontal.

problem 6.2

Air-free saturated steam at 65°C condenses on the outer surface of a 25 mm outer diameter 3 m long vertical tube maintained at a uniform temperature of 35°C by flow of cooling water through the tube. Assuming film condensation and 20% in excess of Nusselt’s value calculate the average heat transfer coefficient over the entire length of the tube and the rate of condensate flow at the bottom of the tube. Confirm that the flow is laminar.