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Propulsion driven by self-oscillation via an electrohydrodynamic instability
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA.ORCID iD: 0000-0002-3443-0709
Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA..
2019 (English)In: Physical Review Fluids, ISSN 2469-990X, Vol. 4, no 6, article id 061701Article in journal (Refereed) Published
Abstract [en]

Oscillations of flagella and cilia play an important role in biology, which motivates the idea of functional mimicry as part of bioinspired applications. Nevertheless, it still remains challenging to drive their artificial counterparts to oscillate via a steady, homogeneous stimulus. Combining theory and simulations, we demonstrate a strategy to achieve this goal by using an elastoelectrohydrodynamic instability (based on the Quincke rotation instability). In particular, we show that applying a uniform dc electric field can produce self-oscillatory motion of a microrobot composed of a dielectric particle and an elastic filament. Upon tuning the electric field and filament elasticity, the microrobot exhibits three distinct behaviors: a stationary state, undulatory swimming, and steady spinning, where the swimming behavior stems from an instability emerging through a Hopf bifurcation. Our results imply the feasibility of engineering self-oscillations by leveraging the elastoviscous response to control the type of bifurcation and the form of instability. We anticipate that our strategy will be useful in a broad range of applications imitating self-oscillatory natural phenomena and biological processes.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 4, no 6, article id 061701
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-255312DOI: 10.1103/PhysRevFluids.4.061701ISI: 000473044300001Scopus ID: 2-s2.0-85069747426OAI: oai:DiVA.org:kth-255312DiVA, id: diva2:1340960
Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved

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Zhu, Lailai

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