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Rheologica Acta

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05-01-2022 | Original Contribution

Analysis of direct force measurements during capillary pinching of visco-elastic fluids in CaBER type experiments

Authors: Jasper Van Aeken, Luca Passaro, Christian Clasen

Published in: Rheologica Acta | Issue 3/2022

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Abstract

A novel device is presented for direct measurement of the axial force evolution during the pinching of fluid filaments following an extensional step stretch, based on the “tilted-CaBER.” The bending curve of a horizontally orientation fluid filament is fitted with the full expression of a catenary function, to directly and unambiguously extract the axial force from a single fitting parameter. The general limits of axial force determination from such devices are introduced in terms of a Bond number that accounts for the axial length scale. The new set-up is validated using a Newtonian PDMS oil, for which the axial force scaling and the related prefactors X of the similarity solution are known. For dilute polymer solutions in form of a Boger fluid, the so far theoretical factor X = 1.5 for an Oldroyd-B model fluid could be experimentally approached for the first time with the new setup.

previous article Application of the tan δ method in the determination of the melting temperature of κ-carrageenan gels in the presence of calcium ions

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Title: Analysis of direct force measurements during capillary pinching of visco-elastic fluids in CaBER type experiments
Authors: Jasper Van Aeken
Luca Passaro
Christian Clasen
Publication date: 05-01-2022
Publisher: Springer Berlin Heidelberg
Published in: Rheologica Acta / Issue 3/2022
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-021-01322-z

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