Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X34: Non-Newtonian Flows: General
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 201
Chair: Antony Beris, University of Delaware
Abstract: X34.00010 : Anomalous crystalline ordering of particles in a viscoelastic fluid under high shear
9:57 AM–10:10 AM
Presenter:
Sijie Sun
(harvard university)
Authors:
Sijie Sun
(harvard university)
Nan Xue
(ETH Zürich)
Stefano Aime
(Harvard University)
Hyoungsoo Kim
(Korea Advanced Institute of Science and Technology (KAIST))
Jizhou Tang
(Harvard University)
Gareth H McKinley
(Massachusetts Institute of Technology)
Howard A Stone
(Princeton University)
David A Weitz
(Harvard University)
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 new, 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.
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