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Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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A Microfluidic-based Hydrodynamic Trap for Single Particles
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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.