A constitutive model for sheared dense fiber suspensions
Abstract
We propose a constitutive model to predict the viscosity of fiber suspensions, which undergoes shear thinning, at various volume fractions, aspect ratios, and shear stresses/rates. We calibrate the model using the data from direct numerical simulation and prove the accuracy by predicting experimental measurements from the literature. We use a friction coefficient decreasing with the normal load between the fibers to quantitatively reproduce the experimentally observed shear thinning in fiber suspensions. In this model, the effective normal contact force, which is directly proportional to the bulk shear stress, determines the effective friction coefficient. A rise in the shear stress reduces the effective friction coefficient in the suspension. As a result, the jamming volume fraction increases with the shear stress, resulting in a shear thinning in the suspension viscosity. Moreover, we extend the model to quantify the effects of fiber volume fraction and aspect ratio in the suspension. We calibrate this model using the data from numerical simulations for the rate-controlled shear flow. Once calibrated, we show that the model can be used to predict the relative viscosity for different volume fractions, shear stresses, and aspect ratios. The model predictions are in excellent agreement with the available experimental measurements from themore »
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 2283541
- Alternate Identifier(s):
- OSTI ID: 1914365
- Grant/Contract Number:
- EE0008910
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Fluids
- Additional Journal Information:
- Journal Volume: 35; Journal Issue: 1; Journal ID: ISSN 1070-6631
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; friction; fiber suspension; computer simulation; computational fluid dynamics; fluid flows; rheology and fluid dynamics; rheological properties; shear thinning
Citation Formats
Khan, Monsurul, More, Rishabh V., and Ardekani, Arezoo M. A constitutive model for sheared dense fiber suspensions. United States: N. p., 2023.
Web. doi:10.1063/5.0134728.
Khan, Monsurul, More, Rishabh V., & Ardekani, Arezoo M. A constitutive model for sheared dense fiber suspensions. United States. https://doi.org/10.1063/5.0134728
Khan, Monsurul, More, Rishabh V., and Ardekani, Arezoo M. Mon .
"A constitutive model for sheared dense fiber suspensions". United States. https://doi.org/10.1063/5.0134728. https://www.osti.gov/servlets/purl/2283541.
@article{osti_2283541,
title = {A constitutive model for sheared dense fiber suspensions},
author = {Khan, Monsurul and More, Rishabh V. and Ardekani, Arezoo M.},
abstractNote = {We propose a constitutive model to predict the viscosity of fiber suspensions, which undergoes shear thinning, at various volume fractions, aspect ratios, and shear stresses/rates. We calibrate the model using the data from direct numerical simulation and prove the accuracy by predicting experimental measurements from the literature. We use a friction coefficient decreasing with the normal load between the fibers to quantitatively reproduce the experimentally observed shear thinning in fiber suspensions. In this model, the effective normal contact force, which is directly proportional to the bulk shear stress, determines the effective friction coefficient. A rise in the shear stress reduces the effective friction coefficient in the suspension. As a result, the jamming volume fraction increases with the shear stress, resulting in a shear thinning in the suspension viscosity. Moreover, we extend the model to quantify the effects of fiber volume fraction and aspect ratio in the suspension. We calibrate this model using the data from numerical simulations for the rate-controlled shear flow. Once calibrated, we show that the model can be used to predict the relative viscosity for different volume fractions, shear stresses, and aspect ratios. The model predictions are in excellent agreement with the available experimental measurements from the literature. The findings of this study can potentially be used to tune the fiber size and volume fraction for designing the suspension rheology in various applications.},
doi = {10.1063/5.0134728},
journal = {Physics of Fluids},
number = 1,
volume = 35,
place = {United States},
year = {Mon Jan 23 00:00:00 EST 2023},
month = {Mon Jan 23 00:00:00 EST 2023}
}
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