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Arbitrary axisymmetric steady streaming: Flow, force and propulsion
(SpringerJournal of Engineering Mathematics, 2016)
A well-developed method to induce mixing on microscopic scales is to exploit flows generated by steady streaming. Steady streaming is a classical fluid dynamics phenomenon whereby a time-periodic forcing in the bulk or ...
Slender-ribbon theory
(American Institute of PhysicsPhysics of Fluids, 2016-01-11)
Ribbons are long narrow strips possessing three distinct material length scales (thickness, width, and length) which allow them to produce unique shapes unobtainable by wires or filaments. For example, when a ribbon has ...
Stresslets Induced by Active Swimmers
(American Physical SocietyPhysical Review Letters, 2016-09-30)
Active particles disturb the fluid around them as force dipoles, or stresslets, which govern their collective dynamics. Unlike swimming speeds, the stresslets of active particles are rarely determined due to the lack of a ...
Hydrodynamic interactions between nearby slender filaments
(IOP PublishingEPL (Europhysics Letters), 2016-11-28)
Cellular biology abound with filaments interacting through fluids, from intracellular microtubules, to rotating flagella and beating cilia. While previous work has demonstrated the complexity of capturing nonlocal hydrodynamic ...
Phoretic flow induced by asymmetric confinement
(Cambridge University PressJournal of Fluid Mechanics, 2016-06-28)
Internal phoretic flows due to the interactions of solid boundaries with local chemical gradients may be created using chemical patterning. Alternatively, we demonstrate here that internal flows might also be induced by ...
Structured light enables biomimetic swimming and versatile locomotion of photoresponsive soft microrobots
(Nature Publishing GroupNature Materials, 2016-02-15)
Microorganisms move in challenging environments by periodic changes in body shape. In contrast, current artificial microrobots cannot actively deform, exhibiting at best passive bending under external fields. Here, by ...
Bacterial Hydrodynamics
(Annual ReviewsAnnual Review of Fluid Mechanics, 2016)
Bacteria predate plants and animals by billions of years. Today, they are the
world’s smallest cells, yet they represent the bulk of the world’s biomass
and the main reservoir of nutrients for higher organisms. Most bacteria ...
Small acoustically forced symmetric bodies in viscous fluids
(American Institute of PhysicsJournal of the Acoustical Society of America, 2016-03-03)
The total force exerted on a small rigid body by an acoustic field in a viscous fluid is addressed analytically in the limit where the typical size of the particle is smaller than both the viscous diffusion length scale ...
A squirmer across Reynolds numbers
(Cambridge University PressJournal of Fluid Mechanics, 2016)
The self-propulsion of a spherical squirmer - a model swimming organism that achieves locomotion via steady tangential movement of its surface - is quantified across the transition from viscously to inertially dominated ...
Rotation of slender swimmers in isotropic-drag media
(American Physical SocietyPhysical Review E, 2016)
The drag anisotropy of slender filaments is a critical physical property allowing swimming in low-Reynolds number flows, and without it linear translation is impossible. Here we show that, in contrast, net rotation can ...