Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorVuckovac, Maja
dc.contributor.authorBackholm, Matilda
dc.contributor.authorTimonen, Jaakko V.I.
dc.contributor.authorRas, Robin H.A.
dc.contributor.departmentDepartment of Applied Physics
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.date.accessioned2020-11-30T08:19:29Z
dc.date.available2020-11-30T08:19:29Z
dc.date.issued2020-10
dc.description| openaire: EC/H2020/725513/EU//SuperRepel
dc.description.abstractIt is well known that an increased viscosity slows down fluid dynamics. Here we show that this intuitive rule is not general and can fail for liquids flowing in confined liquid-repellent systems. A gravity-driven, highly viscous glycerol droplet inside a sealed superhydrophobic capillary is moving more than 10 times faster than a water droplet with three-orders-of-magnitude lower viscosity. Using tracer particles, we show that the low-viscosity droplets are rapidly rotating internally, with flow velocities greatly exceeding the center-of-mass velocity. This is in stark contrast to the faster moving high-viscosity droplets with nearly vanishing internal flows. The anomalous viscosity-enhanced flow is caused by a viscosity-suppressed deformation of the droplet-air interface and a hydro- and aerodynamic coupling between the droplet and the air trapped within the micro/nanostructures (plastron). Our work demonstrates the unexpected role of the plastron in controlling fluid flow beyond the mere reduction in contact area and friction.en
dc.description.versionPeer revieweden
dc.format.extent8
dc.format.mimetypeapplication/pdf
dc.identifier.citationVuckovac , M , Backholm , M , Timonen , J V I & Ras , R H A 2020 , ' Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries ' , Science Advances , vol. 6 , no. 42 , eaba5197 . https://doi.org/10.1126/sciadv.aba5197en
dc.identifier.doi10.1126/sciadv.aba5197
dc.identifier.issn2375-2548
dc.identifier.otherPURE UUID: c9bc919d-dbd8-4f0b-9003-35c3ff4ff3e8
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/c9bc919d-dbd8-4f0b-9003-35c3ff4ff3e8
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dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/52773120/Vuckovac_Viscosity_enhanced_droplet_motion.eaba5197.full.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/61803
dc.identifier.urnURN:NBN:fi:aalto-2020113020648
dc.language.isoenen
dc.publisherAMER ASSOC ADVANCEMENT SCIENCE
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/725513/EU//SuperRepel
dc.relation.ispartofseriesScience Advancesen
dc.relation.ispartofseriesVolume 6, issue 42en
dc.rightsopenAccessen
dc.titleViscosity-enhanced droplet motion in sealed superhydrophobic capillariesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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