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  11. Origins Of The Reverse Janssen Effect

Origins of the reverse Janssen effect

Srujal Shah1, Ana Maria Mosquera Gomez1, Payman Jalali1

  • 1Lappeenranta-Lahti University of Technology, School of Energy Systems, LUT, 53851 Lappeenranta, Finland.

Physical Review. E
|February 7, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

The reverse Janssen effect shows granular column base forces exceeding particle weight. Pouring height significantly amplifies this effect, offering insights into granular material behavior and simulations.

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • The Janssen effect describes reduced pressure in granular materials compared to liquids.
  • The reverse Janssen effect is a counterintuitive phenomenon where base force exceeds total weight.
  • Understanding granular material behavior is crucial for various engineering applications.

Purpose of the Study:

  • To investigate the reverse Janssen effect experimentally and computationally.
  • To determine the influence of the pouring protocol on the reverse Janssen effect.
  • To compare experimental findings with simulation results.

Main Methods:

  • Experimental setup involving granular particle columns.
  • Computational simulations of granular material behavior.

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  • Systematic variation of pouring height and flux parameters.

    • Main Results:

    • The reverse Janssen effect is strongly dependent on the pouring protocol.
    • Increased pouring height (tens of particle diameters) leads to a significantly stronger reverse Janssen effect.
    • Pouring flux also influences the effect, though to a lesser extent.

    Conclusions:

    • The pouring protocol is a critical factor in the reverse Janssen effect.
    • Experimental and computational results align, validating the understanding of the phenomenon.
    • This study enhances the comprehension of granular physics and its comparison with liquid systems.