Prediction of shear thickening of particle suspensions in viscoelastic fluids by direct numerical simulation

Matsuoka, Yuki; Nakayama, Yasuya; Kajiwara, Toshihisa

doi:10.1017/jfm.2021.5

Cited by 10 publications

(2 citation statements)

References 69 publications

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“…16 The SP method has been successfully used to study suspensions of self-propelled particles in Newtonian fluids [17][18][19][20][21][22] and passive particles in viscoelastic fluids. 23,24 Here, we extend it for the first time to investigate suspensions of self-propelled particles in viscoelastic fluids. To the best of our knowledge, there have been limited reports on numerical investigations of a suspension of active particles in viscoelastic fluids in three dimensions.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulations of a microswimmer in a viscoelastic fluid

Kobayashi,

Jung,

Matsuoka

et al. 2023

Soft Matter

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Section: Introductionmentioning

confidence: 99%

Direct numerical simulations of a microswimmer in a viscoelastic fluid

Kobayashi,

Jung,

Matsuoka

et al. 2023

Soft Matter

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“…At low

and low shear rates, the particles follow streamlines, and the behavior of the suspension is similar to that of the suspending fluid ( 12 , 13 ). As the shear rate increases, however, the large polymer molecules become increasingly stretched and cannot fully relax, resulting in a stress normal to the streamline, causing particles to cross streamlines ( 14 – 18 ), particle chaining ( 19 – 25 ) and shear thickening ( 26 – 29 ). At high shear rates, the stretched polymer exerts yet larger elastic stresses; even in the absence of particles, these stresses dominate over viscous stress and can destabilize the flow field, resulting in an elastic instability and so lead to the development of a secondary chaotic flow ( 30 – 36 ).…”

mentioning

confidence: 99%

Anomalous crystalline ordering of particles in a viscoelastic fluid under high shear

Sun,

Xue,

Aime

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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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.

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