FORCED CONVECTIVE HEAT AND MASS. TRANSFER FROM A FALLING FILM TO A LAMINAR EXTERNAL BOUNDARY LAYER

Abstract Simultaneous momentum, heat- and mass-transfer rates from a vertical falling liquid film to an upward flow of gas are reported. The gas forms an external boundary layer along the liquid film. In all cases dimensionless transport rates were determined from property gradients measured at the inner edge of the boundary layer. The velocity, temperature and concentration profiles were measured using hot wire anemometric, thermocouple probe and isokinetic sampling with gas Chromatographie analysis techniques. Particular numerical and integral solutions to the boundary-layer equations are in good agreement with the data.