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Role of Flow Inertia in Aggregate Restructuring and Breakage at Finite Reynolds Numbers.

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Flow inertia significantly influences aggregate breakage in multiphase flows, even at low Reynolds numbers. This study reveals how flow inertia affects aggregate evolution and breakage probability.

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Area of Science:

  • Fluid Dynamics
  • Multiphase Flow Systems
  • Aggregate Dynamics

Background:

  • Aggregate properties like size and structure dictate forces acting upon them.
  • Hydrodynamic forces, primarily viscous at finite Reynolds numbers, influence aggregate breakage, size, and structure.
  • Flow inertia, often overlooked, necessitates solving Navier-Stokes equations for accurate aggregate evolution modeling.

Purpose of the Study:

  • To numerically investigate the impact of flow inertia on fractal aggregate evolution in simple shear flow.
  • To understand how flow inertia affects aggregate breakage rate and stable size.
  • To establish the role of flow inertia in aggregate evolution under low but finite Reynolds number conditions.

Main Methods:

  • Numerical simulation of aggregate evolution in simple shear flow at finite Reynolds numbers.
  • Coupling particle-flow interactions using an immersed boundary method.
  • Solving flow dynamics with a lattice Boltzmann method and tracking particle dynamics via a discrete element method.

Main Results:

  • Aggregate breakage rate depends on momentum diffusion and the ratio of particle interaction to hydrodynamic forces.
  • Momentum diffusion kinetics prevent instantaneous breakage even at high shear stresses.
  • Flow inertia favors aggregate breakage probability without altering nonbreaking aggregate morphology at moderate Reynolds numbers.

Conclusions:

  • Flow inertia plays a crucial role in aggregate evolution, particularly in breakage kinetics.
  • This study provides a novel perspective on aggregate breakage in low but finite Reynolds number flows.
  • Findings are relevant for understanding particulate systems in various industrial and natural processes.