Experimental investigation of Falling Film Evaporation Heat Transfer Coefficient on Horizontal tube

摘要

The heat transfer process of falling film evaporation on horizontal tubes in distillation desalination plants can be divided into two parts, evaporation outside the tubes and condensation in the tubes. The heat transfer coefficient of the outside is about 50% of that inside. So the overall heat transfer coefficient is influenced mainly by the falling film evaporation outside tubes. A research on experiments of falling film evaporation heat transfer outside horizontal tube is introduced in this paper Experiments were carried out to show how the heat transfer coefficient is affected by different parameters including heat flux density, circumference direction of tubes, spray density, evaporation temperature and experimental fluid. The results reveal that the heat transfer coefficient shows certain tendencies with the change of the parameters mentioned above. These results provide a basis for further developing high efficiency heat transfer processes and advanced evaporators.