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Settling Properties and Fractal Dimensions of Aggregated Water Emulsions in Native Crude Oils

In as-prepared emulsions with volume fractions of water φ < 0.18, clusters of ca. 30 water droplets are basic structural units. In course of settling, these clusters form transient percolation aggregates with fractal dimension DF ≈ 2.38, and the final structure of the sediment is a tight emulsion gel with packing density of 0.74. In emulsions with φ > 0.29, the basic structural units are individual water droplets which form percolation aggregates with DF ≈ 2.60. The final structure of the respective sediment is a less tight emulsion gel with packing density of 0.64. In emulsions with 0.18 < φ < 0.29, settling kinetics is characterized by both fractal dimensions.