Transition from steady shear to oscillatory shear rheology of dense suspensions
Dong, Junhao LU and Trulsson, Martin LU
(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.
(Less)
- author
- Dong, Junhao
LU
and Trulsson, Martin
LU
- organization
- publishing date
- 2020
- 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
-
- pmid:33327063
- scopus:85096918383
- 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}},
}