TRANSPORT TO FALLING FILMS
There is reviewed the experimental and theoretical status of film flowing down a wall, without shear at the interface, for heating of the fluid by the wall, for evaporation from the interface due to heating of the fluid by the wall, and for absorption by the fluid of a gas. The hydrodynamic behavior is reviewed briefly as a basis for the prediction of the transport. Then there are considered the predictions obtained from constant thickness models for laminar and for turbulent flow. Finally, attention is directed to variable thickness models which take a more realistic view of the waves that actually exist on the surface.