Abstract
Entrance region flow of falling liquid films in inclined wetted-wall columns with an overflow-type distributor was investigated theoretically and experimentally. The equations of motion based on boundary layer approximations were solved for the wave-free laminar flow of falling liquid films and a numerical solution was obtained for the dimensionless thickness of the falling liquid film, i.e., the Galileo number as a function of the liquid Reynolds number, the dimensionless distance in flow direction, and the angle of inclination of the wetted-wall plate. The liquid film thicknesses of water and aqueous sucrose solutions on inclined wetted-wall plates were measured and compared with theoretical predictions. The agreement between experimental data and theoretical predictions was fairly good in the wave-free entrance region of the falling liquid films.
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