A special high-pressure homogenization process - simultaneous homogenization and mixing (SHM) - was applied to produce hexadecane (C16H34), octadecane (C18H38), eicosane (C20H42), and docosane (C22H46) in water dispersions. Additionally, a high-shear stress zone (HSSZ) was connected to the SHM unit to investigate the influence of external forces during supercooling on dispersion stability. The HSSZ did not affect the droplet disruption efficiency but induced aggregation behavior of the dispersed phase with increasing alkane chain length and dispersed-phase content. High-shear treatment during crystallization led to a change in particle shape, which was more favorable to aggregation.