AUGMENTATION OF R-113 IN-TUBE CONDENSATION WITH MICRO-FIN TUBES.
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The effects of several geometrical parameters (peak shape, valley shape, fin height, number of fins, and spiral angle) on single phase and condensation heat transfer and pressure drop were experimentally investigated. A smooth tube and eight augmented tubes of 9. 52 mm OD were tested with R-113. The average heat transfer coefficient was increased by 45% to 283% over the reference smooth tube value. The pressure drop increase was generally less than 100%. The tubes were ranked according to their heat transfer and pressure drop performance using a statistical approach. One of the best performing tubes had 65 spiraled fins along with a flat peak and flat valley. A second tube with equally good performance also had 65 fins and a flat valley but a round peak.
author list (cited authors)
Khanpara, J. C., Bergles, A. E., & Pate, M. B.