On the Hydrodynamic Equilibrium of a Rod in a Lattice Fluid

Details On the Hydrodynamic Equilibrium of a Rod in a Lattice Fluid On the Hydrodynamic Equilibrium of a Rod in a Lattice Fluid

2000-01-13

arxiv.org/abs/math/0001073v2

J. Phys. A: Math. Gen. 33 4725-4740 2000

Mathematics

Probability

19 pages, 2 figures

Scientific paper

10.1088/0305-4470/33/26/301

We model the behavior of a big (Brazil) nut in a medium of smaller nuts with a stochastic asymmetric simple exclusion dynamics of a polymer-monomer lattice system. The polymer or `rod' can move up or down in an external negative field, occupying N horizontal lattice sites where the monomers cannot enter. The monomers (at most one per site) or `fluid particles' are moving symmetrically in the horizontal plane and asymmetrically in the vertical direction, also with a negative field. For a fixed position of the rod, this lattice fluid is in equilibrium with a vertical height profile reversible for the monomers' motion. Upon `shaking' (speeding up the monomers) the motion of the `rod' dynamically decouples from that of the monomers resulting in a reversible random walk for the rod around an average height proportional to log N.

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