Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/81055
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dc.creatorJosephine Zilz
dc.creatorChristof Schäfer
dc.creatorChristian Wagner
dc.creatorRobert J. Poole
dc.creatorManuel A. Alves
dc.creatorAnke Lindner
dc.date.accessioned2022-09-08T13:36:19Z-
dc.date.available2022-09-08T13:36:19Z-
dc.date.issued2014
dc.identifier.issn1473-0197
dc.identifier.othersigarra:106287
dc.identifier.urihttps://hdl.handle.net/10216/81055-
dc.description.abstractWe propose a novel device capable of measuring relaxation times of viscoelastic fluids as small as 1 ms. In contrast to most rheometers, which by their very nature are concerned with producing viscometric or nearly-viscometric flows, here we make use of an elastic instability that occurs in the flow of viscoelastic fluids with curved streamlines. To calibrate the rheometer we combine simple scaling arguments with relaxation times obtained from first normal-stress difference data measured in a classical shear rheometer. As an additional check we also compare these relaxation times to those obtained from Zimm theory and good agreement is observed. Once calibrated, we show how the serpentine rheometer can be used to access smaller polymer concentrations and lower solvent viscosities where classical measurements become difficult or impossible to use due to inertial and/or resolution limitations. In the absence of calibration, the serpentine channel can still be a very useful comparative or index device.
dc.language.isoeng
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.subjectCiências da engenharia e tecnologias
dc.subjectEngineering and technology
dc.titleSerpentine channels: micro-rheometers for fluid relaxation times
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.identifier.doi10.1039/C3LC50809A
dc.identifier.authenticusP-006-HZY
dc.subject.fosCiências da engenharia e tecnologias
dc.subject.fosEngineering and technology
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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