Propulsion of a Two-Sphere Swimmer

Klotsa, Daphne; Baldwin, Kyle A.; Hill, R.; Bowley, R. M.; Swift, Michael

doi:10.1103/physrevlett.115.248102

Cited by 57 publications

(83 citation statements)

References 33 publications

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“…Indeed it is known that the scallop theorem does not hold in complex fluids [38]; fluid inertia, nearby surfaces, elasticity of the swimmer body, or interaction with other swimmers are some other reasons why a reciprocal gait for a swimmer may lead to net motion [38]. In truth, the motivation for this work came from the interesting experimental and computational works of Klotsa et al [39] and Jones et al [40] who show that an assembly of two rigid collinear spheres with a single degree of freedom can swim in the presence of inertia, and can in fact also reverse its direction at higher Reynolds number. Felderhof [41] then theoretically studied the effect of inertia on the motion of such collinear swimmers.…”

Section: Introductionmentioning

confidence: 99%

Two-sphere swimmers in viscoelastic fluids

2018

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We examine swimmers comprising of two rigid spheres which oscillate periodically along their axis of symmetry, considering both when the oscillation is in phase and anti-phase, and study the effects of fluid viscoelasticity on their net motion. These swimmers both display reciprocal motion in a Newtonian fluid and hence no net swimming is achieved over one cycle. Conversely, we find that when the two spheres are of different sizes, the effect of viscoelasticity acts to propel the swimmers forward in the direction of the smaller sphere. Finally, we compare the motion of rigid spheres oscillating in viscoelastic fluids with elastic spheres in Newtonian fluids where we find similar results. * Electronic mail: gelfring@mech.ubc.ca arXiv:1809.04268v1 [physics.flu-dyn]

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Section: Introductionmentioning

confidence: 99%

Two-sphere swimmers in viscoelastic fluids

2018

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“…12. special interest: [114]: This paper introduces a smart utilization of acoustic streaming for self-propulsion. The combination of simulations and experiments gives a clear understanding of the mechanisms at play.…”

Section: Perspectivesmentioning

confidence: 99%

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

Driscoll

Delmotte

2019

Current Opinion in Colloid & Interface Science

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In this review article, we focus on collective motion in externally driven colloidal suspensions, as well as how these collective effects can be harnessed for use in microfluidic applications. We highlight the leading role of hydrodynamic interactions in the self-assembly, emergent behavior, transport, and mixing properties of colloidal suspensions. A special emphasis is given to recent numerical methods to simulate driven colloidal suspensions at large scales. In combination with experiments, they help us to understand emergent dynamics and to identify control parameters for both individual and collective motion in colloidal suspensions.

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“…Besides the parameters given in section 2. k =´--. The shaking period T is chosen so, that the capsule's inertia is significant and the capsule is sufficiently deformed: T/τ v ≈2 and T/τ k ≈0.9 (see equations (26) and (37)).…”

Section: Actuation Of a Symmetric Capsule In A Non-symmetrically Shakmentioning

confidence: 99%

“…The time-dependence of the shaking determines also the direction of passive swimming. This motion is distinct from particle locomotion in oscillatory flows at finite Re, where propulsion is related to streaming flows and a fluid jet in the wake of the swimmer [26].…”

Section: Introductionmentioning

confidence: 96%

Engineering passive swimmers by shaking liquids

et al. 2019

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The locomotion and design of microswimmers are topical issues of current fundamental and applied research. In addition to numerous living and artificial active microswimmers, a passive microswimmer was identified only recently: a soft, Λ-shaped, non-buoyant particle propagates in a shaken liquid of zero-mean velocity (Jo et al 2016 Phys. Rev. E 94 063116). We show that this novel passive locomotion mechanism works for realistic non-buoyant, asymmetric Janus microcapsules as well. According to our analytical approximation, this locomotion requires a symmetry breaking caused by different Stokes drags of soft particles during the two half periods of the oscillatory liquid motion. It is the intrinsic anisotropy of Janus capsules and Λ-shaped particles that break this symmetry for sinusoidal liquid motion. Further, we show that this passive locomotion mechanism also works for the wider class of symmetric soft particles, e.g. capsules, by breaking the symmetry via an appropriate liquid shaking. The swimming direction can be uniquely selected by a suitable choice of the liquid motion. Numerical studies, including lattice Boltzmann simulations, also show that this locomotion can outweigh gravity, i.e. non-buoyant particles may be either elevated in shaken liquids or concentrated at the bottom of a container. This novel propulsion mechanism is relevant to many applications, including the sorting of soft particles like healthy and malignant (cancer) cells, which serves medical purposes, or the use of non-buoyant soft particles as directed microswimmers.

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Propulsion of a Two-Sphere Swimmer

Cited by 57 publications

References 33 publications

Two-sphere swimmers in viscoelastic fluids

Two-sphere swimmers in viscoelastic fluids

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

Engineering passive swimmers by shaking liquids

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