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Area of Science:

  • Fluid dynamics
  • Particle transport
  • Complex flow phenomena

Background:

  • Branching junctions are critical in fluid systems, influencing particle distribution.
  • Understanding inertial particle capture in these junctions is vital for applications like blood flow and industrial processes.
  • Previous studies often simplified junction geometry or particle inertia, limiting applicability.

Purpose of the Study:

  • To elucidate the underlying mechanisms of finite, inertial particle capture in branching junctions.
  • To identify and characterize the three-dimensional flow structures responsible for particle trapping.
  • To determine the influence of Reynolds and Stokes numbers on particle capture and flow topology.

Main Methods:

  • Numerical simulations to model fluid flow and particle trajectories.
  • Analytical approaches to understand the identified flow structures.
  • Stability analysis to map parameter regions for particle capture.

Main Results:

  • Discovery of invisible, anchor-shaped 3D flow structures causing particle capture.
  • These Reynolds-number-dependent structures create trapping regions within the junction.
  • A topological transition (merger of anchors) observed in V-shaped junctions at a critical Stokes number.

Conclusions:

  • Anchor-shaped flow structures are the primary mechanism for inertial particle capture in branching junctions.
  • The study defines the parameter space (particle size, density, flow conditions) for anchor-induced capture.
  • Findings provide a new framework for predicting particle behavior in complex fluid flows.