Einfluss der kontinuierlichen und der dispersen Phase auf das rheologische Verhalten von Emulsionen

Tests were made with Newtonian paraffin oil as the disperse phase (drops) and surfactant solutions in demineralized water as the continuous phase. Surfactant used was non-ionic polyoxyethylenesorbitantrioleate TweenTM 85 at 5 vol %. The oil-in-water emulsions were tested at two different average drop sizes, 1 and 20 m and quasimonomodal drop size distribution. Rheological behavior was studied in stationary shear flow and oscillating shear stress. The rheological properties of the emulsions were determined in terms of the material behavior of the continuous and disperse phases. The influence of the disperse phase related not only to drop concentration and mass properties concerning the average drop size, but also to the drop size distribution and the boundary layer properties of the drops which generated the interparticle transfer effects, and the deformation of the disperse phase in the total system. The influence of the disperse phase on flow behavior was illustrated i n a plot of shear velocity in reciprocal seconds vs. viscosity in Pascal-seconds for the emulsion, surfactant solution, and water.