Enhancement of water vapor absorption into a LiBr-water solution film falling along a vertical finned plate

A numerical analysis was carried out to determine the effects of vertical finned surfaces on the characteristics of water vapor absorption into aqueous lithium bromide falling films. The temperature of the wall including the fin was assumed to be of constant, and the fully-developed laminar film was assumed to have a constant thickness. Calculations were performed for several combinations of fin height and fin pitch. It was shown that the absorption rate was greatly enhanced by the fin's cooling effect within a certain distance from the inlet. It was also shown that the absorption rate was further increased by mixing the film, after the film had flowed a reasonable distance down from the inlet.