Influence of a Surfactant on Evaporation Intensity of Suspended Water Droplets

摘要

Experimental data have been presented on the evaporation rate of suspended droplets of both pure water and water containing approximate to 1.5 wt % surfactant, sodium dodecyl sulfate. Evaporation occurs in a convective flow of dry air, with its velocity and temperature being varied within ranges of U-0 = 1-5 m/s and T-0 = 20-80 degrees C, respectively. The density of the mass flux from the surface of the surfactant-containing droplets is 2-3 times lower than that in the case of pure water. For droplets in a dry air flow, the change in their diameter can be described by a set of similarity criteria, and a generalized linear empirical dependence of the evaporation rate on thermodynamic parameters may be constructed for these droplets.