Volume 104, Number 1, October 2013
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||25 October 2013|
Hydrodynamic ratchet: Controlled motion of a polymer in an alternating microchannel flow
1 Department of Chemical Physics, University of Science and Technology of China - Hefei, Anhui, 230026, China
2 Institut für Theoretische Physik, Technische Universtität Berlin - Hardenbergstrasse 36, D-10623 Berlin, Germany
3 Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Plank-Gesellschaft - Faradayweg 4-6, 14195 Berlin, Germany
Received: 2 September 2013
Accepted: 2 October 2013
Using ratchets, periodic or irregular oscillations can be transformed into steady translational or rotational motions. Here, we consider a model system that operates as a hydrodynamic ratchet. A polymer is placed inside a narrow channel where an oscillating Poiseuille flow is externally created. The ratchet mechanism is implemented by introducing a feedback control for the lateral position of the polymer through which its mobility becomes effectively dependent on the direction of its motion along the channel. We employ the semi-flexible elastic chain modeling for the polymer and use the method of multi-particle collision dynamics to simulate the fluid. We indeed observe directed motion of the polymer and determine the dependence of the propagation velocity on the model parameters.
PACS: 47.61.-k – Micro- and nano- scale flow phenomena / 47.57.Ng – Polymers and polymer solutions / 47.11.-j – Computational methods in fluid dynamics
© EPLA, 2013
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