Rotational propulsion enabled by inertia

  • François Nadal
  • On Shun Pak
  • LaiLai Zhu
  • Luca Brandt
  • Eric Lauga
Regular Article

DOI: 10.1140/epje/i2014-14060-y

Cite this article as:
Nadal, F., Pak, O.S., Zhu, L. et al. Eur. Phys. J. E (2014) 37: 60. doi:10.1140/epje/i2014-14060-y

Abstract

The fluid mechanics of small-scale locomotion has recently attracted considerable attention, due to its importance in cell motility and the design of artificial micro-swimmers for biomedical applications. Most studies on the topic consider the ideal limit of zero Reynolds number. In this paper, we investigate a simple propulsion mechanism --an up-down asymmetric dumbbell rotating about its axis of symmetry-- unable to propel in the absence of inertia in a Newtonian fluid. Inertial forces lead to continuous propulsion for all finite values of the Reynolds number. We study computationally its propulsive characteristics as well as analytically in the small-Reynolds-number limit. We also derive the optimal dumbbell geometry. The direction of propulsion enabled by inertia is opposite to that induced by viscoelasticity.

Graphical abstract

Keywords

Soft Matter: Colloids and Nanoparticles 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • François Nadal
    • 1
  • On Shun Pak
    • 2
  • LaiLai Zhu
    • 3
    • 4
  • Luca Brandt
    • 3
  • Eric Lauga
    • 5
  1. 1.Commissariat à l’Energie AtomiqueLe BarpFrance
  2. 2.Department of Mechanical and Aerospace EngineeringPrinceton UniversityPrincetonUSA
  3. 3.Linné Flow CenterKTH MechanicsStockholmSweden
  4. 4.Laboratory of Fluid Mechanics and InstabilitiesEPFLLausanneSwitzerland
  5. 5.Department of Applied Mathematics and Theoretical PhysicsUniversity of Cambridge, Center for Mathematical SciencesCambridgeUK

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