How entropy and hydrodynamics cooperate in rectifying particle transport
arXiv:1304.4438 · doi:10.1140/epjst/e2013-02029-4
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.
11 pages, 7 figures
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- Transport coefficients for a confined Brownian ratchet operating between two heat reservoirs
- Inertial hydrodynamic ratchet: Rectification of colloidal flow in tubes of variable diameter
- Giant enhancement of hydrodynamically enforced entropic trapping in thin channels
- Rectified motion in an asymmetric channel: the role of hydrodynamic interactions with walls
- Adsorption and desorption in confined geometries: a discrete hopping model
- Hydrodynamic drift ratchet scalability