title: Hydrodynamically enforced entropic Brownian pump.
abstract: Transport of overdamped Brownian particles in a finite hydrodynamical channel is investigated in the presence of the ac driving force and the pressure-driven flow. The system is bounded by two particle reservoirs. With the help of the Fick-Jacobs method, we obtain the directed current of Brownian particles and the pumping capacity of the system. The directed transport is determined by the competitions among the asymmetry of the channel, the ac driving force, the pressure-driven flow, and the concentration difference. Their interplays can exhibit the peculiar properties. Remarkably, the particles can be pumped through the channel from the lower concentration reservoir to the higher concentration one, or from the lower pressure side to the higher pressure one. In addition, due to the existence of the pressure drop, ac driving force still plays the significant role on directed transport even in a completely symmetric channel. Our results could be implemented in constrained structures with narrow channels or pores where the particles are suspended in a solvent.
authors.affiliation: Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, Guangzhou 510006, China.
authors.forename: Bao-quan
authors.initials: BQ
authors.lastname: Ai
authors.forename: Ya-feng
authors.initials: YF
authors.lastname: He
authors.forename: Feng-guo
authors.initials: FG
authors.lastname: Li
authors.forename: Wei-rong
authors.initials: WR
authors.lastname: Zhong
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D019277:Entropy; D057446:Hydrodynamics; D008956:Models, Chemical; D009038:Motion; D010316:Particle Size; D011312:Pressure