Using Available Volume to Predict Fluid Diffusivity in Random Media

Details Using Available Volume to Predict Fluid Diffusivity in Random Media Using Available Volume to Predict Fluid Diffusivity in Random Media

2006-10-03

arxiv.org/abs/cond-mat/0610058v1

Phys. Rev. E 74, 040102 (2006).

Physics

Condensed Matter

Statistical Mechanics

to appear in Physical Review E (12 pages, 4 figures)

Scientific paper

10.1103/PhysRevE.74.040102

We propose a simple equation for predicting self-diffusivity of fluids embedded in random matrices of identical, but dynamically frozen, particles (i.e., quenched-annealed systems). The only nontrivial input is the volume available to mobile particles, which also can be predicted for two common matrix types that reflect equilibrium and non-equilibrium fluid structures. The proposed equation can account for the large differences in mobility exhibited by quenched-annealed systems with indistinguishable static pair correlations, illustrating the key role that available volume plays in transport.

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