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We investigate through molecular dynamics the transition from Knudsen tomolecular diffusion transport towards 2d absorbing interfaces with irregulargeometry. Our results indicate that the length of the active zone decreasescontinuously with density from the Knudsen to the molecular diffusion regime.In the limit where molecular diffusion dominates, we find that this lengthapproaches a constant value of the order of the system size, in agreement withtheoretical predictions for Laplacian transport in irregular geometries.Finally, we show that all these features can be qualitatively described interms of a simple random-walk model of the diffusion process.Comment: 4 pages, 4 figure

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