Rotational propulsion enabled by inertia
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
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.
small reynolds numbers, viscous-fluid, arbitrary shape, flapping flight, 2 spheres, motion, microfluidics, migration, particle, ciliary
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-149985DOI: 10.1140/epje/i2014-14060-yISI: 000339867500001ScopusID: 2-s2.0-84956930322OAI: oai:DiVA.org:kth-149985DiVA: diva2:742261
QC 201409012014-09-012014-08-292014-09-01Bibliographically approved