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Coupled aggregation and sedimentation processes: the sticking probability effect.

G Odriozola1, R Leone, A Schmitt

  • 1Departamento de Química Física y Matemática, Facultad de Química, Universidad de la República, 11800 Montevideo, Uruguay.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2003
PubMed
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Simulations reveal how sticking probability and drift velocity affect aggregation and sedimentation. Sedimentation dynamics are influenced by sticking probability at short times and Péclet number at long times.

Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Coupled aggregation and sedimentation are crucial in various natural and industrial processes.
  • Understanding the kinetics and structure formation in these systems is essential.

Purpose of the Study:

  • To investigate the influence of sticking probability (P) and drift velocity on aggregation and sedimentation kinetics.
  • To analyze cluster morphology and sediment structure formation.
  • To validate simulation results against experimental data.

Main Methods:

  • Numerical simulations were performed in a large prism without periodic boundary conditions.
  • Time evolution of cluster size distribution (CSD) and weight-average cluster size (n(w)) were tracked.
  • Cluster morphology and sediment structure were analyzed in different regions.

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Main Results:

  • Aggregation and sedimentation in the bulk are governed by P at short times and Péclet number (Pe) at long times.
  • The local weight-average cluster size in the sediment layer grows with an exponent of four, independent of Pe and P.
  • Simulation results align well with experimental data, suggesting internal cluster rearrangement.

Conclusions:

  • The study elucidates the distinct roles of sticking probability and Péclet number in coupled aggregation-sedimentation.
  • A universal growth exponent for sediment formation was identified.
  • The findings support the interpretation of experimental observations and highlight the fractal nature of sediment structure.