Heat transfer and stability conditions in the case of falling liquid films of aqueous solutions

A steam-heated copper plate was used in the investigation. The liquids studied in the experiments included aqueous glycerol and calcium-chloride solutions of various concentrations. Questions concerning the heat transfer to falling films in the case of surface and nucleate boiling are investigated, giving particular attention to the dependence of the heat transfer coefficient on the concentration of the solution. It is found that for surface boiling conditions the material parameter values are important. The validity limits of the equations for the calculation of minimum-wetting requirements are discussed.