Reverse Brazil nut problem: competition between percolation and condensation |
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Authors: | Hong D C Quinn P V Luding S |
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Institution: | Physics, Lewis Laboratory, Lehigh University, Bethlehem, PA 18015, USA. |
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Abstract: | In the Brazil nut problem (BNP), hard spheres with larger diameters rise to the top. There are various explanations (percolation, reorganization, convection), but a broad understanding or control of this effect is by no means achieved. A theory is presented for the crossover from BNP to the reverse Brazil nut problem based on a competition between the percolation effect and the condensation of hard spheres. The crossover condition is determined, and theoretical predictions are compared to molecular dynamics simulations in two and three dimensions. |
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