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Title: The Effect of Step-Stretch Parameters on Capillary Breakup Extensional Rheology (CaBER) Measurements
Authors: Rothstein, J.P.
Miller, E.
Moldenaers, Paula
Clasen, Christian #
Issue Date: Aug-2008
Publisher: American Institute of Physics
Host Document: American Institute of Physics Conference Proceedings vol:1027 issue:Part 2 pages:1117-1119
Conference: The XVth International Congress on Rheology and The Society of Rheology 80th Annual Meeting edition:15 location:Monterey, CA (USA) date:3-8 August 2008
Abstract: Extensional rheometry has only recently been developed into a commercially available tool with the
introduction of the capillary breakup extensional rheometer (CaBER). CaBER is currently being used to measure the
transient extensional viscosity evolution of mid to low-viscosity viscoelastic fluids. The elegance of capillary breakup
extensional experiments lies in the simplicity of the procedure. An initial step-strain is applied to generate a fluid
filament. What follows is a self-driven uniaxial extensional flow in which surface tension is balanced by the extensional
stresses resulting from the capillary thinning of the liquid bridge. In this paper, we present a series of experiments in
which the step-strain parameters of final length and the extension rate of the stretch were varied and their effects on the
measured extensional viscosity and extensional relaxation time were recorded. To focus on the parameter effects, wellcharacterized
surfactant wormlike micelle solutions, polymer solutions and immiscible polymer blends were used to
include a range of characteristic relaxation times and morphologies. Our experimental results demonstrate a strong
dependence of extensional rheology on step-stretch conditions. In addition, numerical simulations were performed using
the appropriate constitutive models to assist in both the interpretation of the CaBER results and the optimization of the
experimental protocol. From our results, it is clear that any rheological results obtained using the CaBER technique must
be properly considered in the context of the stretch parameters and the effects that pre-conditioning has on viscoelastic
fluids.
ISBN: 978-0-7354-0549-3
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Soft Matter, Rheology and Technology Section
# (joint) last author

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