Repeat Prob. 10–69 for a horizontal tube.

Data from problem 69

Saturated steam at 55°C is to be condensed at a rate of 10 kg/h on the outside of a 3-cm-outer-diameter vertical tube whose surface is maintained at 45°C by the cooling water. Determine the required tube length. 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?