Large amplitude oscillatory shear rheo-NMR velocimetry

Complex fluids display flow heterogeneities and a variety of nonlinearities under large amplitude oscillatory shear (LAOS). LAOS has developed as a means of characterizing nonlinear fluid rheology. In this study, the spatial velocity distribution during LAOS is measured by rheo-nuclear magnetic reso...

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Bibliographic Details
Published in:Physics of fluids (1994) 2023-09, Vol.35 (9)
Main Authors: Jayaratne, Jayesha S., Codd, Sarah L., Al-Kaby, Rehab N., Maley, Josephine, Brox, Timothy I., Galvosas, Petrik, Seymour, Joseph D.
Format: Article
Language:English
Subjects:
Amplitudes
Fluid dynamics
Fluid flow
NMR
Nonlinearity
Nuclear magnetic resonance
Oscillating flow
Physics
Rheological properties
Rheology
Shear
Time dependence
Velocimetry
Velocity distribution
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Summary:Complex fluids display flow heterogeneities and a variety of nonlinearities under large amplitude oscillatory shear (LAOS). LAOS has developed as a means of characterizing nonlinear fluid rheology. In this study, the spatial velocity distribution during LAOS is measured by rheo-nuclear magnetic resonance (Rheo-NMR) velocimetry. Rheo-NMR is frequently used to measure responses of complex fluids to steady shear deformations by imaging local velocity across a fluid gap noninvasively. Rheo-NMR analysis of oscillatory flow has been more limited due to hardware limitations. Recently developed Rheo-NMR equipment makes LAOS Rheo-NMR possible. LAOS Rheo-NMR provides measurement of spatial velocity profiles as a function of oscillatory period, providing time dependent spatially resolved local velocity time series, which show distinct features dependent on material response.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0161704