Anomalous crystalline ordering of particles in a viscoelastic fluid under high shear
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sun-et-al-2023-anomalous-crystalline-ordering-of-particles-in-a-viscoelastic-fluid-under-high-shear.pdf
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7.2 MB
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Checksum (MD5)
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Author(s)
Sun, Sijie
Xue, Nan
Aime, Stefano
Kim, Hyoungsoo
Tang, Jizhou
McKinley, Gareth H.
Stone, Howard A.
Weitz, David A.
Date Issued
September 29, 2023
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Citation
Sun, Sijie, Xue, Nan, Aime, Stefano, Kim, Hyoungsoo, Tang, Jizhou et al. 2023. "Anomalous crystalline ordering of particles in a viscoelastic fluid under high shear." Proceedings of the National Academy of Sciences, 120 (40).
Version
Final published version
Abstract
Addition of particles to a viscoelastic suspension dramatically alters the properties of the mixture, particularly when it is sheared or otherwise processed. Shear-induced stretching of the polymers results in elastic stress that causes a substantial increase in measured viscosity with increasing shear, and an attractive interaction between particles, leading to their chaining. At even higher shear rates, the flow becomes unstable, even in the absence of particles. This instability makes it very difficult to determine the properties of a particle suspension. Here, we use a fully immersed parallel plate geometry to measure the high-shear-rate behavior of a suspension of particles in a viscoelastic fluid. We find an unexpected separation of the particles within the suspension resulting in the formation of a layer of particles in the center of the cell. Remarkably, monodisperse particles form a crystalline layer which dramatically alters the shear instability. By combining measurements of the velocity field and torque fluctuations, we show that this solid layer disrupts the flow instability and introduces a single-frequency component to the torque fluctuations that reflects a dominant velocity pattern in the flow. These results highlight the interplay between particles and a suspending viscoelastic fluid at very high shear rates.
Subjects
Multidisciplinary
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1073/pnas.2304272120
