科研之友
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摘要
Transport of overdamped Brownian particles in a periodic hydrodynamical channel is investigated in the presence of an asymmetric unbiased force a transverse gravitational force, and a pressure-driven flow. With the help of the generalized Fick-Jacobs approach, we obtain an analytical expression for the directed current and the generalized potential of mean force. It is found that. when the transverse gravitational force is larger than a certain value, the current is suppressed. Moreover, when the temporal as parameter of the unbiased force is negative, the current, is always negative. However. when the temporal asymmetry parameter is positive, the transverse gravitational force and the pressure drop not only determine the direction of the current, but also affect, its amplitude. In particular, the competition between the asymmetric unbiased force and the pressure drop can result, in multiple current reversals.
- 出版日期2014-4
- 单位华南师范大学
