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Visualizing the hydrodynamics in sieve-based lateral displacement systems.

J P Dijkshoorn1,2, J C de Valença2, R M Wagterveld2

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Summary
This summary is machine-generated.

Deterministic lateral displacement (DLD) systems use flow lanes for particle separation. Adjusting flow conditions, not just geometry, controls particle displacement, enhancing DLD

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Area of Science:

  • Fluid Dynamics
  • Particle Separation Technology

Background:

  • Deterministic lateral displacement (DLD) systems separate particles using structured flow lanes.
  • Established DLD geometric criteria are thought essential for particle displacement.
  • Previous studies achieved separation in simplified DLD systems deviating from criteria.

Purpose of the Study:

  • Investigate the hydrodynamics in simplified DLD systems.
  • Understand why simplified DLD systems achieve particle displacement.
  • Explore alternative methods for controlling DLD separation.

Main Methods:

  • Experimental visualization of flow lanes.
  • Measurement of local flow velocities using microparticle image velocimetry (µPIV).
  • Comparison with 2D fluid dynamics simulations.

Main Results:

  • Flow lane size strongly correlates with local flow velocities (Vy and Vx).
  • Hydrodynamics significantly influence flow lane characteristics.
  • Simplified DLD systems achieve separation by manipulating hydrodynamics.

Conclusions:

  • DLD geometric design criteria are one method to control hydrodynamics, not the only one.
  • Particle separation in DLD is achievable through hydrodynamic control beyond strict geometric rules.
  • Findings increase DLD technique flexibility and industrial scalability.