Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J37: Rheology I
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 203AB
Chair: William Schultz, University of Michigan
Abstract: J37.00003 : Unpicking the SECRETs of kinematically mixed rheology with Shear Extension Combined Rheology Experimental Techniques*
5:01 PM–5:14 PM
Presenter:
Richard Hodgkinson
(The University of Sheffield)
Author:
Richard Hodgkinson
(The University of Sheffield)
The author developed and proved a technique that allows us to study shear viscosity under not a conventional pure shear flow, but for the first time, one containing a simultaneous combination of shear and extensional deformation. This is relevant to flows of materials which show extension-aligning behaviour, from polymers to anisotropic particle suspensions. The results stand to inform fluid model development and validation towards improved prediction of complex, industrially-relevant flow fields.
The initial particle image velocimetry study (https://doi.org/10.1122/8.0000380) was limited to a transparent solution with a specific (refractive index matched) solvent composition. The new project - an EPSRC funded fellowship - will make a unique transformation. It will apply magnetic resonance velocity imaging, enabling the study of and providing exemplar data for a wide variety of systems, including opaque suspensions.
Coupled to this, independent measurement of shear and extension rates in arbitrarily orientated flow fields is surprisingly non-trivial and disconnected from our apparently well-defined shear and extension rates in the laboratory reference frame. Discussion is invited going forward towards clarifying this difficulty.
*EPSRC Reference EP/X028089/1 (NFFDy: National Fellowships in Fluid Dynamics) - S.E.C.R.E.T. : Shear Extension Combined Rheology Experimental Techniques
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