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Janssen effect in dynamic particulate systems.

C R K Windows-Yule1,2, Sebastian Mühlbauer1, L A Torres Cisneros1

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This summary is machine-generated.

The Janssen model accurately describes stress in granular materials even when the container geometry changes dynamically. This study validates the model in dynamic regimes and proposes an extension for better characterization.

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Area of Science:

  • Physics
  • Engineering
  • Material Science

Background:

  • The Janssen model is a key theoretical framework for stress redistribution in particulate assemblies.
  • It traditionally assumes static particle packing and has not been tested in dynamic or geometrically altering systems.

Purpose of the Study:

  • To investigate the applicability of the Janssen model to granular beds within containers with dynamically altered geometries.
  • To explore pressure distributions and particle flow in constrained, dynamic particulate systems.

Main Methods:

  • Utilized a container with a laterally mobile sidewall to dynamically alter system dimensions (depth, height, cross-sectional area).
  • Induced particle rearrangements and flow by changing the container geometry.
  • Measured and analyzed pressure distributions across various system expansion rates.

Main Results:

  • The Janssen model successfully describes pressure distributions in dynamic granular systems, even with liquid-like flow.
  • The model's validity was confirmed across a broad range of system expansion rates.
  • Observed significant particle rearrangements and flow induced by dynamic geometric alterations.

Conclusions:

  • The Janssen model is robust and applicable to dynamic particulate systems with changing geometries.
  • An extension to the Janssen model is proposed for enhanced characterization of constrained dynamic systems.
  • This research bridges the gap between static theoretical models and real-world dynamic granular behavior.