Abstract
Experimental data are reported for condensation of R-113 and steam on six three-dimensional pin-fin tubes. Enhancements of the vapor-side heat transfer coefficient between 3.6 and 9.9 were found for R-113 and between 2.4 and 2.9 for steam when compared to a plain tube at the same vapor-side temperature difference. For R-113, heat transfer enhancement was in all cases approximately double the increase in surface area, while for steam it was largely independent of increase in surface area. Condensate retention between the pins on the lower part of the tubes was lower than for comparable two-dimensional fin tubes but was still significant.
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