Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102226
Title: Apparent yield stress in rigid fibre suspensions: The role of attractive colloidal interactions
Authors: Bounoua, S.
Lemaire, E.
Férec, J.
Ausias, G.
Zubarev, A.
Kuzhir, P.
Issue Date: 2016
Publisher: Cambridge University Press
Citation: Apparent yield stress in rigid fibre suspensions: The role of attractive colloidal interactions / S. Bounoua, E. Lemaire, J. Férec, et al. — DOI 10.1017/jfm.2016.475 // Journal of Fluid Mechanics. — 2016. — Vol. 802. — P. 611-633.
Abstract: This work is focused on the modelling of the shear and normal stresses in fibre suspensions that are subjected to a simple shear flow in the presence of short-range lubrication forces, van der Waals and electrostatic forces, as well as solid friction forces between fibres. All of these forces are weighed by the contact probability. The theory is developed for attractive fibres with van der Waals interaction dominating over electrostatic repulsion. The model predicts a simple Bingham law for both the shear stress and the first normal stress difference, with the apparent shear and normal yield stresses proportional to the second and the third power of the particle volume fraction respectively. The model is applied to the experimental data of Rakatekar et al. (Adv. Mater., vol. 21, 2009, pp. 874-878) and Natale et al. (AIChE J., vol. 60, 2014, pp. 1476-1487) on suspensions of carbon nanotubes dispersed in a Newtonian epoxy resin. It reproduces well the quadratic dependence of the apparent yield stress on the particle volume fraction(πyασ2 for average particle aspect ratios of and 1200, while it underpredicts the power-law exponent for (always predicting σ2 behaviour instead of σ3.2). © 2016 Cambridge University Press.
Keywords: COLLOIDS
RHEOLOGY
SUSPENSIONS
ASPECT RATIO
CARBON
COLLOIDS
ELECTROSTATICS
EPOXY RESINS
FIBERS
FRICTION
RHEOLOGY
SHEAR FLOW
SHEAR STRESS
SUSPENSIONS (FLUIDS)
VAN DER WAALS FORCES
VOLUME FRACTION
YARN
COLLOIDAL INTERACTION
ELECTROSTATIC REPULSION
FIRST NORMAL STRESS DIFFERENCE
PARTICLE ASPECT RATIOS
PARTICLE VOLUME FRACTIONS
POWER LAW EXPONENT
QUADRATIC DEPENDENCE
VAN DER WAALS INTERACTIONS
YIELD STRESS
COLLOID
FRICTION
POWER LAW
RHEOLOGY
SHEAR FLOW
SHEAR STRESS
URI: http://hdl.handle.net/10995/102226
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84981155247
PURE ID: 1089081
ISSN: 221120
DOI: 10.1017/jfm.2016.475
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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