Repeat Prob. 10-71 for a horizontal tube. Compare the required diameters between a vertical tube and a horizontal tube to condense 12 kg/h of steam during the condensation process.

Data from problem 71

A 1.5-m-long vertical tube is used for condensing saturated steam at 60°C. The surface temperature of the tube is maintained at a uniform temperature of 40°C by flowing coolant inside the tube. Determine the heat transfer rate to the tube and the required tube diameter to condense 12 kg/h of steam during the condensation process. 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?