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Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Vuckovac, Maja
dc.contributor.author Backholm, Matilda
dc.contributor.author Timonen, Jaakko V.I.
dc.contributor.author Ras, Robin H.A.
dc.date.accessioned 2020-11-30T08:19:29Z
dc.date.available 2020-11-30T08:19:29Z
dc.date.issued 2020-10
dc.identifier.citation Vuckovac , 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.aba5197 en
dc.identifier.issn 2375-2548
dc.identifier.other PURE UUID: c9bc919d-dbd8-4f0b-9003-35c3ff4ff3e8
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/c9bc919d-dbd8-4f0b-9003-35c3ff4ff3e8
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85093706075&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/52773120/Vuckovac_Viscosity_enhanced_droplet_motion.eaba5197.full.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/61803
dc.description | openaire: EC/H2020/725513/EU//SuperRepel
dc.description.abstract It 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.format.extent 8
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/H2020/725513/EU//SuperRepel
dc.relation.ispartofseries Science Advances en
dc.relation.ispartofseries Volume 6, issue 42 en
dc.rights openAccess en
dc.title Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Applied Physics
dc.contributor.department Department of Bioproducts and Biosystems en
dc.identifier.urn URN:NBN:fi:aalto-2020113020648
dc.identifier.doi 10.1126/sciadv.aba5197
dc.type.version publishedVersion

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