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Related Experiment Videos

Reversing the Brazil-nut effect: competition between percolation and condensation.

A P J Breu1, H-M Ensner, C A Kruelle

  • 1Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany.

Physical Review Letters
|February 7, 2003
PubMed
Summary

Experiments on shaken granular mixtures reveal the Brazil-nut effect, where large particles rise. Researchers observed a controllable reverse Brazil-nut effect, demonstrating tunable particle segregation in binary mixtures.

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Granular phase transition as a precondition for segregation.

Physical review letters·2003

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Granular mixtures exhibit complex behaviors when subjected to external forces.
  • The Brazil-nut effect describes the phenomenon where larger particles rise in a shaken mixture.
  • Theoretical models predict a reverse Brazil-nut effect, where larger particles sink.

Purpose of the Study:

  • To experimentally investigate the transition between the Brazil-nut effect and its reverse form in binary granular mixtures.
  • To explore the influence of particle size, material, and excitation on segregation patterns.
  • To demonstrate the controllability of particle demixing.

Main Methods:

  • Utilizing vertically shaken binary mixtures of spherical beads with varying diameters and materials.

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  • Systematically varying external excitation parameters to observe segregation dynamics.
  • Analyzing the direction of particle demixing (upward or downward movement of larger particles).

    • Main Results:

    • Observed both the classic Brazil-nut effect and the predicted reverse Brazil-nut effect.
    • Demonstrated that the direction of demixing is highly sensitive to the external excitation.
    • Showcased the ability to switch between the two effects for a given mass density ratio by adjusting excitation.

    Conclusions:

    • The segregation behavior in binary granular mixtures is controllable through external excitation.
    • Experimental evidence supports the existence and tunability of the reverse Brazil-nut effect.
    • Findings have implications for understanding and manipulating granular flows and separations.