Abstract
The usability of the laminar boundary layer theory, in which the surface velocity of falling liquid film is taken into account, for the estimation of gas-phase mass transfer rates in cocurrent gas-liquid contact operations on a vertical flat wall was examined experimentally.
Experiments were carried out for the vaporization of four different organic liquids (MeOH, EtOH, IPA and CCl4) into air flowing over a wetted surface in a square duct. Velocity and concentration profiles in gas stream near moving liquid surface were measured, along with surface temperature profiles of the liquid film.
The experimental values of velocity and concentration profiles in the gas phase agreed well with those obtained from the numerical solutions in this work.
It was confirmed that the experimental values of modified Sherwood numbers for the gas phase agreed well with those obtained from the numerical solutions in this work and also with the approximate solution by Shirotsuka et al.
