The effect of condensate inundation on condensation heat transfer in tube bundles of marine condensers
Abstract
Experiments, under different conditions, were conducted
to evaluate the effect of condensate inundation on condensation
heat transfer in tube bundles of marine condensers. Five 15.9
mm. (5/8 in) nominal outside diameter, smooth stainless steel
tubes were used in a vertical row to simulate an actual
condenser. Tubes were located in an equilateral triangular
array with a spacing-to-diameter ratio of 1.5.
Heat transfer performance was determined for each tube in
a bundle. Data was taken for condensing steam on the outside
of each tube at about 21 KPa (3 psia) and at about 101 PKa
(14.7 psia). Each tube was cooled by water on the inside at
velocities of 0.78 to 6.22 m/sec (2.56 ft/sec to 20.42 ft/sec).
The overall heat transfer coefficient was determined directly
from experimental data. The inside and outside heat transfer
coefficients were determined using the Wilson plot technique.
Observation of condensate flow showed lateral droplet
motion along the first three tubes in portions of the condenser
under all conditions tested. Side drainage occurred
only over the third and fourth tubes at a condensation
pressure of about 21 KPa. The dominate mode of the flow at
101 KPa condensation pressure was gravitational flow. Outside
heat transfer coefficients were higher than expected under all conditions when compared to the Nusselt theory. The reason
for this is possibly due to secondary vapor flow. Recommendations
to improve validations are provided.
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