AI Article Synopsis
- A new technique merges traditional rheology with ultrasonic imaging to analyze soft materials under shear, enabling researchers to observe local fluid dynamics at high frame rates (up to 10,000 images/second).
- This "rheo-ultrasound" method allows simultaneous measurement of shear rate, shear stress, and viscosity over time.
- Two applications demonstrated include the study of Taylor-Couette instability in viscous fluids and the complex shear-banded flow in non-Newtonian micellar solutions.
Article Abstract
We describe a technique coupling standard rheology and ultrasonic imaging with promising applications to characterization of soft materials under shear. Plane wave imaging using an ultrafast scanner allows to follow the local dynamics of fluids sheared between two concentric cylinders with frame rates as high as 10 000 images per second, while simultaneously monitoring the shear rate, shear stress, and viscosity as a function of time. The capacities of this "rheo-ultrasound" instrument are illustrated on two examples: (i) the classical case of the Taylor-Couette instability in a simple viscous fluid and (ii) the unstable shear-banded flow of a non-Newtonian wormlike micellar solution.
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| http://dx.doi.org/10.1063/1.4801462 | DOI Listing |
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