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15- Brasil Nut Effect

15- Brasil Nut Effect. 15. Brazil Nut Effect When some granular mixture is shaken the larger particles may end up above the smaller ones. Investigate and explain this phenomenon. Under what conditions can the opposite distribution be obtained? By Aron Alexandre Heleodoro. 15- Brasil Nut Effect.

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15- Brasil Nut Effect

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  1. 15- Brasil Nut Effect 15. Brazil Nut Effect When some granular mixture is shaken the larger particles may end up above the smaller ones. Investigate and explain this phenomenon. Under what conditions can the opposite distribution be obtained? By Aron Alexandre Heleodoro

  2. 15- Brasil Nut Effect Introduction • The importance • Historic remarks

  3. 15- Brasil Nut Effect The Problem • Explanation of the Effect • Percolation Effect • Convection Currents • Condensation Effect • Other movement influences • Brazil Nut Effect X Reverse Brazil Nut Effect • Practical observation • Materials • Prediction of the Effects • Data collected • Conclusion

  4. 15- Brasil Nut Effect The Effect • Larger particles end up above • The reverse effect

  5. 15- Brasil Nut Effect The segregation • Normal equilibrium state • Forces a system rearrangement • Smaller particles pass through the holes left by larger particles • Percolation

  6. 15- Brasil Nut Effect Condensation Effect • Energy associated to a system • Temperature Analogy and Solid-liquid transition (fluidizing)

  7. 15- Brasil Nut Effect Convection Currents • Currents arise in the middle • Dependence of the angle for others configurations

  8. 15- Brasil Nut Effect Other Influences in the Movement • Interstitial fluid and its properties • Particles interactions • Complex shaking movements

  9. 15- Brasil Nut Effect BNE X RBNE • Oscillating changes and special configurations • Geometry of the recipient • Temperature • Particles properties

  10. 15- Brasil Nut Effect Experiment Model • Considerations in the experiment • Vertical oscillation • Particles interactions • They are in the air • Theory (Percolation X Condensation) • Percolation • 2D system (discs) • 3D system (spheres) • Condensation • Critical temperature • Factor of percolation : temperature ratio

  11. 15- Brasil Nut Effect Experiment Model • Graphics • 2D • 3D

  12. 15- Brasil Nut Effect Experiment Model * Various spheres * Recipients * Shaking system (vertical oscillation) • Materials • Set up

  13. 15- Brasil Nut Effect Experiment Data • First: • mass ratio: 1/2 • diameter ratio: 2 • recipient: cylinder • BNE • Second: • mass ratio: 1/10 • diameter ratio: 3 • recipient: Obliquous wall • RBNE • Third: • mass ratio: 6 • diameter ratio: 2 • recipient: cylinder • BNE • Photos • Data

  14. 15- Brasil Nut Effect Experiment - Error Sources • Sphere imprecision • Particles interactions • Oscillation source • Chronometer • Parallaxes

  15. 15- Brasil Nut Effect Final Considerations • Others conditions and distributions • Others methods of explanation

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