Question

For laminar film condensation, what is the ratio of heat transfer to a horizontal tube of large diameter to that of a vertical tube of the same size for the same temperature difference?

• A. \( 0.64 \cdot (UD)^{1/2} \)
• B. \( 0.64 \cdot (UD)^{1/4} \)
• C. \( 0.64 \cdot (LD) \)
• D. \( 0.64 \cdot (UD)^{3/4} \)

Hint:

Orientation impacts condensation heat transfer significantly in heat exchanger designs.

Answer 1

The Correct Option is B

The heat transfer in condensation depends on the geometry and orientation of the tube. For horizontal tubes, a correction factor proportional to \( (UD)^{1/4} \) accounts for the difference in heat transfer behavior compared to vertical tubes.