Local Rheology Relation with Variable Yield Stress Ratio across Dry, Wet, Dense, and Dilute Granular Flows
Pähtz, Thomas ; Durán, Orencio ; De Klerk, David N. ; Govender, Indresan and Trulsson, Martin LU
(2019)
In Physical Review Letters
123(4).
- Abstract
Dry, wet, dense, and dilute granular flows have been previously considered fundamentally different and thus described by distinct, and in many cases incompatible, rheologies. We carry out extensive simulations of granular flows, including wet and dry conditions, various geometries and driving mechanisms (boundary driven, fluid driven, and gravity driven), many of which are not captured by standard rheology models. For all simulated conditions, except for fluid-driven and gravity-driven flows close to the flow threshold, we find that the Mohr-Coulomb friction coefficient μ scales with the square root of the local Péclet number Pe provided that the particle diameter exceeds the particle mean free path. With decreasing Pe and granular... (More)
Dry, wet, dense, and dilute granular flows have been previously considered fundamentally different and thus described by distinct, and in many cases incompatible, rheologies. We carry out extensive simulations of granular flows, including wet and dry conditions, various geometries and driving mechanisms (boundary driven, fluid driven, and gravity driven), many of which are not captured by standard rheology models. For all simulated conditions, except for fluid-driven and gravity-driven flows close to the flow threshold, we find that the Mohr-Coulomb friction coefficient μ scales with the square root of the local Péclet number Pe provided that the particle diameter exceeds the particle mean free path. With decreasing Pe and granular temperature gradient M, this general scaling breaks down, leading to a yield condition with a variable yield stress ratio characterized by M.
(Less)
- author
- Pähtz, Thomas
; Durán, Orencio
; De Klerk, David N.
; Govender, Indresan
and Trulsson, Martin
LU
- organization
- publishing date
- 2019-07-24
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 123
- issue
- 4
- article number
- 048001
- publisher
- American Physical Society
- external identifiers
-
- pmid:31491250
- scopus:85069950486
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.123.048001
- language
- English
- LU publication?
- yes
- id
- 6b16d62b-4e14-4afb-8578-2c3c7eba13de
- date added to LUP
- 2019-08-29 11:40:52
- date last changed
- 2024-04-16 18:13:30
@article{6b16d62b-4e14-4afb-8578-2c3c7eba13de,
abstract = {{<p>Dry, wet, dense, and dilute granular flows have been previously considered fundamentally different and thus described by distinct, and in many cases incompatible, rheologies. We carry out extensive simulations of granular flows, including wet and dry conditions, various geometries and driving mechanisms (boundary driven, fluid driven, and gravity driven), many of which are not captured by standard rheology models. For all simulated conditions, except for fluid-driven and gravity-driven flows close to the flow threshold, we find that the Mohr-Coulomb friction coefficient μ scales with the square root of the local Péclet number Pe provided that the particle diameter exceeds the particle mean free path. With decreasing Pe and granular temperature gradient M, this general scaling breaks down, leading to a yield condition with a variable yield stress ratio characterized by M.</p>}},
author = {{Pähtz, Thomas and Durán, Orencio and De Klerk, David N. and Govender, Indresan and Trulsson, Martin}},
issn = {{0031-9007}},
language = {{eng}},
month = {{07}},
number = {{4}},
publisher = {{American Physical Society}},
series = {{Physical Review Letters}},
title = {{Local Rheology Relation with Variable Yield Stress Ratio across Dry, Wet, Dense, and Dilute Granular Flows}},
url = {{http://dx.doi.org/10.1103/PhysRevLett.123.048001}},
doi = {{10.1103/PhysRevLett.123.048001}},
volume = {{123}},
year = {{2019}},
}