Air-free, saturated steam at temperature Tv = 100 oC condenses on the outer surface of a horizontal tube of length L = 1.8 m and outer diameter D = 1 cm, maintained at a uniform temperature Tw = 65 oC.

Calculate:

(a) the average condensation heat-transfer coefficient over the entire length of the tube.

(b) the total condensation rate at the tube surface

If steam flows downwards across the outer surface of the tube at a velocity of 2 m/s, calculate:

(c) the average condensation heat-transfer coefficient over the entire length of the tube.

(d) the total condensation rate at the tube surface.