NOTE ON COMBINED BOILING AND EVAPORATION OF LIQUID-FILMS ON HORIZONTAL TUBES

In a recent study by the authors, a simple model was developed for predicting heat transfer by combined boiling and evaporation of liquid films on horizontal tubes. Predictions were shown to be in good agreement with the experimental data of L. S. Fletcher, et al. , and R. Liu for evaporating water films. Unfortunately no data for other working fluids, such as ammonia, was available at that time. Subsequently a number of investigators published experimental data for ammonia evaporating on horizontal tubes. The purpose of this technical note is to provide a comparison between those data and the authors' analytical model.