| 초록 |
The aggregate breakup process is deeply relevant to interparticle potential among primary particles, flow rate and flow type. Aggregates which experience hydrodynamic stress can restructure and breakup into small fragments with various size and configuration. In this study, Brownian dynamics simulation is used to describe the motion of primary particles and DLVO potential is used to describe interparticle interaction. In this work, the aggregate breakup process under various standard flows, e.g. simple shear flow and pure extensional flows, will be discussed with fractal dimension and bond number distribution. With these structural analysis methods, the fragment size distribution formed by aggregate breakup is characterized in both shear and elongational flow. The morphology change of colloidal aggregate particles under elongational flow is compared to that under shear flow. Also, the time evolution of maximum cluster size is investigated to analyze breakage efficiency of shear and extensional flow conditions. |
