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arXiv · 1304.4438

How entropy and hydrodynamics cooperate in rectifying particle transport

S. Martens·G. Schmid·A. V. Straube·L. Schimansky-Geier·P. Hänggi
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Abstract

Using the analytical Fick-Jacobs approximation formalism and extensive Brownian dynamics simulations we study particle transport through two-dimensional periodic channels with triangularly shaped walls. Directed motion is caused by the interplay of constant bias acting along the channel axis and a pressure-driven flow. In particular, we analyze the particle mobility and the effective diffusion coefficient. The mechanisms of entropic rectification is revealed in channels with a broken spatial reflection symmetry in presence of hydrodynamically enforced entropic trapping. Due to the combined action of the forcing and the pressure-driven flow field, efficient rectification with a drastically reduced diffusivity is achieved.

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S. Martens, G. Schmid, A. V. Straube, L. Schimansky-Geier, P. Hänggi. 2013-04-16. How entropy and hydrodynamics cooperate in rectifying particle transport. https://doi.org/10.1140/epjst%2Fe2013-02029-4

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