AC-2743 -- Heat Transfer and Pressure Drop during Condensation Inside Horizontal Finned Tubes PDF

The paper reports the results of an experimental study in which heat transfer and pressure drop data were taken during condensation of R-113 inside five horizontal tubes. One tube was smooth, and four were internally finned. The smooth tube data were taken as a basis for comparison with the data of the internally finned tubes. Over the mass flux range tested, an enhancement in the heat transfer coefficients was obtained as high as 51% over the smooth tube results on a nominal area basis. Correlation equations are proposed for predicting the overall heat transfer coefficient and pressure drop during condensation inside internally finned tubes.