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Transition from steady shear to oscillatory shear rheology of dense suspensions

Dong, Junhao LU and Trulsson, Martin LU orcid (2020) In Physical Review E 102(5).
Abstract

Recent studies have highlighted that oscillatory and time-dependent shear flows might help increase the flowability of dense suspensions. While most focus has been on cross-flows we here study a simple two-dimensional suspensions where we apply simultaneously oscillatory and stationary shear along the same direction. We first show that the dissipative viscosities in this set-up significantly decrease with an increasing shear-rate magnitude of the oscillations and given that the oscillatory strain is small, in a similar fashion as found previously for cross-flow oscillations. As for cross-flow oscillations, the decrease can be attributed to the large decrease in the number of contacts and an altered microstructure as one transitions from... (More)

Recent studies have highlighted that oscillatory and time-dependent shear flows might help increase the flowability of dense suspensions. While most focus has been on cross-flows we here study a simple two-dimensional suspensions where we apply simultaneously oscillatory and stationary shear along the same direction. We first show that the dissipative viscosities in this set-up significantly decrease with an increasing shear-rate magnitude of the oscillations and given that the oscillatory strain is small, in a similar fashion as found previously for cross-flow oscillations. As for cross-flow oscillations, the decrease can be attributed to the large decrease in the number of contacts and an altered microstructure as one transitions from a steady shear to an oscillatory shear dominated rheology. As subresults we find both an extension to the μ(J) rheology, a constitutive relationship between the shear stresses and the shear rate, valid for oscillatory shear flows and that shear-jamming of frictional particles at oscillatory shear dominated flows occurs at higher packing fractions compared to steady shear dominated flows.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review E
volume
102
issue
5
article number
052605
publisher
American Physical Society
external identifiers
  • scopus:85096918383
  • pmid:33327063
ISSN
2470-0045
DOI
10.1103/PhysRevE.102.052605
language
English
LU publication?
yes
id
575272c2-c006-475b-89ff-df0039d778d7
date added to LUP
2020-12-11 10:30:14
date last changed
2024-08-08 06:52:36
@article{575272c2-c006-475b-89ff-df0039d778d7,
  abstract     = {{<p>Recent studies have highlighted that oscillatory and time-dependent shear flows might help increase the flowability of dense suspensions. While most focus has been on cross-flows we here study a simple two-dimensional suspensions where we apply simultaneously oscillatory and stationary shear along the same direction. We first show that the dissipative viscosities in this set-up significantly decrease with an increasing shear-rate magnitude of the oscillations and given that the oscillatory strain is small, in a similar fashion as found previously for cross-flow oscillations. As for cross-flow oscillations, the decrease can be attributed to the large decrease in the number of contacts and an altered microstructure as one transitions from a steady shear to an oscillatory shear dominated rheology. As subresults we find both an extension to the μ(J) rheology, a constitutive relationship between the shear stresses and the shear rate, valid for oscillatory shear flows and that shear-jamming of frictional particles at oscillatory shear dominated flows occurs at higher packing fractions compared to steady shear dominated flows. </p>}},
  author       = {{Dong, Junhao and Trulsson, Martin}},
  issn         = {{2470-0045}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review E}},
  title        = {{Transition from steady shear to oscillatory shear rheology of dense suspensions}},
  url          = {{http://dx.doi.org/10.1103/PhysRevE.102.052605}},
  doi          = {{10.1103/PhysRevE.102.052605}},
  volume       = {{102}},
  year         = {{2020}},
}