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Effective interfacial tension in flow-focusing of colloidal dispersions: 3-D numerical simulations and experiments
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.
Univ Claude Bernard, Univ Lyon, ENS Lyon, CNRS,Lab Phys, F-69342 Lyon, France..
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0003-3737-0091
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2019 (Engelska)Ingår i: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 876, s. 1052-1076, artikel-id PII S0022112019005664Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An interface between two miscible fluids is transient, existing as a non-equilibrium state before complete molecular mixing is reached. However, during the existence of such an interface, which typically occurs at relatively short time scales, composition gradients at the boundary between the two liquids cause stresses effectively mimicking an interfacial tension. Here, we combine numerical modelling and experiments to study the influence of an effective interfacial tension between a colloidal fibre dispersion and its own solvent on the flow in a microfluidic system. In a flow-focusing channel, the dispersion is injected as core flow that is hydrodynamically focused by its solvent as sheath flows. This leads to the formation of a long fluid thread, which is characterized in three dimensions using optical coherence tomography and simulated using a volume of fluid method. The simulated flow and thread geometries very closely reproduce the experimental results in terms of thread topology and velocity flow fields. By varying the interfacial tension numerically, we show that it controls the thread development, which can be described by an effective capillary number. Furthermore, we demonstrate that the applied methodology provide the means to measure the ultra-low but dynamically highly significant effective interfacial tension.

Ort, förlag, år, upplaga, sidor
CAMBRIDGE UNIV PRESS , 2019. Vol. 876, s. 1052-1076, artikel-id PII S0022112019005664
Nyckelord [en]
colloids, capillary flows, multiphase flow
Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Fysik, Material- och nanofysik
Identifikatorer
URN: urn:nbn:se:kth:diva-261291DOI: 10.1017/jfm.2019.566ISI: 000486462700001Scopus ID: 2-s2.0-85070832669OAI: oai:DiVA.org:kth-261291DiVA, id: diva2:1359252
Anmärkning

QC 20191008

Tillgänglig från: 2019-10-08 Skapad: 2019-10-08 Senast uppdaterad: 2019-11-26Bibliografiskt granskad

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Gowda, Krishne, VBrouzet, ChristopheSöderberg, DanielLundell, Fredrik

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Gowda, Krishne, VBrouzet, ChristopheSöderberg, DanielLundell, Fredrik
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MekanikLinné Flow Center, FLOWWallenberg Wood Science Center
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Journal of Fluid Mechanics
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