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Rotational propulsion enabled by inertia
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Ecole Polytech Fed Lausanne, Switzerland.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
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2014 (English)In: The European Physical Journal E Soft matter, ISSN 1292-8941, E-ISSN 1292-895X, Vol. 37, no 7, 1-14 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 37, no 7, 1-14 p.
Keyword [en]
small reynolds numbers, viscous-fluid, arbitrary shape, flapping flight, 2 spheres, motion, microfluidics, migration, particle, ciliary
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-149985DOI: 10.1140/epje/i2014-14060-yISI: 000339867500001Scopus ID: 2-s2.0-84956930322OAI: oai:DiVA.org:kth-149985DiVA: diva2:742261
Note

QC 20140901

Available from: 2014-09-01 Created: 2014-08-29 Last updated: 2017-12-05Bibliographically approved

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Brandt, Luca

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