Proposes a generalised correlation for predicting the pressure drop during condensation inside smooth and internally finned tubes. States it predicts the majority of the authors' data points as well as the data points of previous investigations. It was generated from a data bases that is broader than the data base of previous correlations. It has been tested against steam and R113 condensation data.

KEYWORDS: Heat flow, finned tubes, condensation, databases, pressure drop, experiment, testing, refrigerants, R113, steam.