Setting the pace of microswimmers: when increasing viscosity speeds up self-propulsion

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Pande J, Merchant L, Kruger T, Harting J, Smith AS
Zeitschrift: New Journal of Physics
Verlag: IOP PUBLISHING LTD
Jahr der Veröffentlichung: 2017
Band: 19
ISSN: 1367-2630


Abstract


It has long been known that some microswimmers seem to swim counter-intuitively faster when the viscosity of the surrounding fluid is increased, whereas others slow down. This conflicting dependence of the swimming velocity on the viscosity is poorly understood theoretically. Here we explain that any mechanical microswimmer with an elastic degree of freedom in a simple Newtonian fluid can exhibit both kinds of response to an increase in the fluid viscosity for different viscosity ranges, if the driving is weak. The velocity response is controlled by a single parameter Gamma, the ratio of the relaxation time of the elastic component of the swimmer in the viscous fluid and the swimming stroke period. This defines two velocity-viscosity regimes, which we characterize using the bead-spring microswimmer model and analyzing the different forces acting on the parts of this swimmer. The analytical calculations are supported by lattice-Boltzmann simulations, which accurately reproduce the two velocity regimes for the predicted values of Gamma.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Pande, Jayant
Professur für Theoretische Physik
Smith, Ana-Suncana Prof. Dr.
Professur für Theoretische Physik


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Einrichtungen weiterer Autorinnen und Autoren

Forschungszentrum Jülich GmbH (FZJ)
University of Edinburgh


Forschungsbereiche

A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Pande, J., Merchant, L., Kruger, T., Harting, J., & Smith, A.-S. (2017). Setting the pace of microswimmers: when increasing viscosity speeds up self-propulsion. New Journal of Physics, 19. https://dx.doi.org/10.1088/1367-2630/aa6e3a

MLA:
Pande, Jayant, et al. "Setting the pace of microswimmers: when increasing viscosity speeds up self-propulsion." New Journal of Physics 19 (2017).

BibTeX: 

Zuletzt aktualisiert 2018-07-08 um 22:54