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Lasting effects of discontinuous shear thickening in cornstarch suspensions upon flow cessation

Lasting effects of discontinuous shear thickening in cornstarch suspensions upon flow cessation
Lasting effects of discontinuous shear thickening in cornstarch suspensions upon flow cessation
Dense suspensions that exhibit discontinuous shear thickening (DST) undergo complex stress relaxation when the flow abruptly stops. Using rotational rheometry, we study the two-step relaxation of aqueous cornstarch suspensions out of the DST state upon flow cessation and show that the DST fluid retains the memory of its shear-thickening state until the shear stress reaches a constant value at late times. We find that this residual stress at the end of the relaxation increases with the steady-state viscosity before the cessation. Furthermore, the timescales that characterize the two-step exponential decay of the shear stress exhibit near linear dependence on the steady-state viscosity. Within the current framework that ascribes DST to the breakdown of hydrodynamic lubrication layers leading to interparticle frictional contacts, the lasting effects of the steady-state viscosity suggest that the memory of frictional contacts persists until the end of the relaxation, despite the presence of repulsive forces between the particles. These results indicate that complete, spontaneous relaxation of the system out of the DST state is stalled by the partial retention of the frictional force chains, which may be caused by the stationary boundaries and the adhesion between cornstarch particles.
2469-990X
Cho, Jae Hyung
47b66d3c-d306-4994-ab36-c30aec4747d6
Griese, Andrew H.
27b51af4-bd42-4afb-b3a6-f9e39273ed43
Peters, Ivo R
222d846e-e620-4017-84cb-099b14ff2d75
Bischofberger, Irmgard
45bb4a2f-c375-40e5-98ae-2cf5b4c7e685
Cho, Jae Hyung
47b66d3c-d306-4994-ab36-c30aec4747d6
Griese, Andrew H.
27b51af4-bd42-4afb-b3a6-f9e39273ed43
Peters, Ivo R
222d846e-e620-4017-84cb-099b14ff2d75
Bischofberger, Irmgard
45bb4a2f-c375-40e5-98ae-2cf5b4c7e685

Cho, Jae Hyung, Griese, Andrew H., Peters, Ivo R and Bischofberger, Irmgard (2022) Lasting effects of discontinuous shear thickening in cornstarch suspensions upon flow cessation. Physical Review Fluids, 7 (6), [063302]. (doi:10.1103/PhysRevFluids.7.063302).

Record type: Article

Abstract

Dense suspensions that exhibit discontinuous shear thickening (DST) undergo complex stress relaxation when the flow abruptly stops. Using rotational rheometry, we study the two-step relaxation of aqueous cornstarch suspensions out of the DST state upon flow cessation and show that the DST fluid retains the memory of its shear-thickening state until the shear stress reaches a constant value at late times. We find that this residual stress at the end of the relaxation increases with the steady-state viscosity before the cessation. Furthermore, the timescales that characterize the two-step exponential decay of the shear stress exhibit near linear dependence on the steady-state viscosity. Within the current framework that ascribes DST to the breakdown of hydrodynamic lubrication layers leading to interparticle frictional contacts, the lasting effects of the steady-state viscosity suggest that the memory of frictional contacts persists until the end of the relaxation, despite the presence of repulsive forces between the particles. These results indicate that complete, spontaneous relaxation of the system out of the DST state is stalled by the partial retention of the frictional force chains, which may be caused by the stationary boundaries and the adhesion between cornstarch particles.

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Dense_Suspension_Relaxation - Accepted Manuscript
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Accepted/In Press date: 24 May 2022
Published date: 21 June 2022

Identifiers

Local EPrints ID: 458131
URI: http://eprints.soton.ac.uk/id/eprint/458131
ISSN: 2469-990X
PURE UUID: c90ba0d9-a2b9-46a8-9387-3ab37c518acf
ORCID for Ivo R Peters: ORCID iD orcid.org/0000-0002-3549-3322

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Date deposited: 28 Jun 2022 17:41
Last modified: 26 Jul 2022 01:48

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Contributors

Author: Jae Hyung Cho
Author: Andrew H. Griese
Author: Ivo R Peters ORCID iD
Author: Irmgard Bischofberger

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