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Main Title: Hydrodynamic interactions enhance the performance of Brownian ratchets
Author(s): Grimm, Andrej
Stark, Holger
Type: Article
Language Code: en
Abstract: We investigate how hydrodynamic interactions between Brownian particles influence the performance of a fluctuating ratchet. For this purpose, we perform Brownian dynamics simulations of particles that move in a toroidal trap under the influence of a sawtooth potential which fluctuates between two states (on and off). Hydrodynamic interactions are included in the Rotne-Prager approximation. We first consider spatially constant transition rates between the two ratchet states and observe that hydrodynamic interactions significantly increase the mean velocity of the particles but only when they are allowed to change their ratchet states individually. If in addition the transition rate to the off state is localized at the minimum of the ratchet potential, particles form characteristic transient clusters that travel with remarkably high velocities. The clusters form since drifting particles have the ability to push but also pull neighboring particles due to hydrodynamic interactions.
Issue Date: 2011
Date Available: 30-Jun-2016
DDC Class: 530 Physik
Sponsor/Funder: DFG, GRK 1558, Kollektive Dynamik im Nichtgleichgewicht: in kondensierter Materie und biologischen Systemen
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 7
Issue: 7
Publisher DOI: 10.1039/c0sm01085e
Page Start: 3219
Page End: 3227
EISSN: 1744-6848
ISSN: 1744-683X
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Inst. Theoretische Physik » Publications

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