Transition from Knudsen to molecular diffusion in activity of absorbing irregular interfaces

Details Transition from Knudsen to molecular diffusion in activity of absorbing irregular interfaces Transition from Knudsen to molecular diffusion in activity of absorbing irregular interfaces

2003-04-21

arxiv.org/abs/cond-mat/0304465v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures

Scientific paper

10.1103/PhysRevE.68.041608

We investigate through molecular dynamics the transition from Knudsen to molecular diffusion transport towards 2d absorbing interfaces with irregular geometry. Our results indicate that the length of the active zone decreases continuously with density from the Knudsen to the molecular diffusion regime. In the limit where molecular diffusion dominates, we find that this length approaches a constant value of the order of the system size, in agreement with theoretical predictions for Laplacian transport in irregular geometries. Finally, we show that all these features can be qualitatively described in terms of a simple random-walk model of the diffusion process.

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