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Area of Science:

  • Physics
  • Soft Matter Physics
  • Granular Materials

Background:

  • Particle flow through heterogeneous media is often hindered by clogging.
  • Controlling particle dynamics in disordered systems is crucial for various applications.

Purpose of the Study:

  • To investigate the control of particle flow and clogging susceptibility in random obstacle arrays using AC drives.
  • To identify optimal driving parameters for maximizing particle flow rates.

Main Methods:

  • Simulations or experiments involving particles moving through random obstacle arrays.
  • Application of transverse or longitudinal AC drives with varying frequencies and amplitudes.
  • Analysis of flow rates and phase transitions.

Main Results:

  • Particle flow rate can be controlled over several orders of magnitude by adjusting AC drive parameters.
  • An optimal frequency and amplitude exist that maximize particle flow.
  • Distinct phases were observed: a low-frequency heterogeneous creeping clogged phase, an intermediate-frequency high-mobility fluidized state, and a high-frequency heterogeneous frozen clogged state.

Conclusions:

  • AC drives offer a method to control particle flow and clogging in heterogeneous media.
  • The identified optimal driving conditions can maximize flow rates.
  • This technique could be the basis for novel particle separation methods.