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The Hydrodynamics of a Micro-Rocket Propelled by a Deformable Bubble
Ecole Polytech Fed Lausanne, Lab Fluid Mech & Instabil, CH-1015 Lausanne, Switzerland..
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-3443-0709
Ecole Polytech Fed Lausanne, Lab Fluid Mech & Instabil, CH-1015 Lausanne, Switzerland..
2019 (English)In: FLUIDS, ISSN 2311-5521, Vol. 4, no 1, article id 48Article in journal (Refereed) Published
Abstract [en]

We perform simulations to study the hydrodynamics of a conical-shaped swimming micro-robot that ejects catalytically produced bubbles from its inside. We underline the nontrivial dependency of the swimming velocity on the bubble deformability and on the geometry of the swimmer. We identify three distinct phases during the bubble evolution: immediately after nucleation the bubble is spherical and its inflation barely affects the swimming speed; then the bubble starts to deform due to the confinement gradient generating a force that propels the swimmer; while in the last phase, the bubble exits the cone, resulting in an increase in the swimmer velocity. Our results shed light on the fundamental hydrodynamics of the propulsion of catalytic conical swimmers and may help to improve the efficiency of these micro-machines.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 4, no 1, article id 48
Keywords [en]
catalytic microswimmers, bubble-propelled microswimmers, microrockets, numerical simulations, self-propulsion
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-251353DOI: 10.3390/fluids4010048ISI: 000464463800001Scopus ID: 2-s2.0-85063372821OAI: oai:DiVA.org:kth-251353DiVA, id: diva2:1316808
Note

QC 20190521

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-23Bibliographically approved

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Zhu, Lailai

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SeRC - Swedish e-Science Research CentreLinné Flow Center, FLOW
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CiteExportLink to record
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