Condensation Heat Transfer on Finned Tubes with Radial Ridges on the Fin Surfaces. (2nd Report. Theoretical Study).

Abstract

Based on extensive experimentation and observation of condensation on finned tubes with radial ridges on the fin surfaces, a model was developed to predict the condensation performance of that tube. Not only the overall condensation performance, but also the local condensation rates were predicted by this model. The predictions accurately coincide with the experimental data. The ridges on the fin surface play an important role in condensation heat transfer enhancement, because the ridges not only extend the thin condensate film area but also promote convective heat transfer in the film.