Effect of the viscoelasticity of the suspending fluid on structure formation in suspensions

Scirocco, Rossella; Vermant, Jan; Mewis, Jan

doi:10.1016/j.jnnfm.2004.01.010

Cited by 122 publications

(139 citation statements)

References 31 publications

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“…However, it has to be pointed out that, even beyond the initial start-up, the stress response is not periodic but changes as the accumulated strain grows. Indeed, the large amplitudes combined with the viscoelasticity of the medium induce the formation of microstructures, as well documented for simple shear flows [Michele et al (1977); Scirocco et al (2004); Pasquino et al (2010)], that, in turn, alter the bulk stress response.…”

Section: Large Amplitude Oscillatory Shearmentioning

confidence: 85%

“…It is worth emphasizing that particle structures affect both a Newtonian and a viscoelastic suspension in the same quantitative way. However, whereas fluid viscoelasticity may readily induce the formation of structures [Michele et al (1977); Scirocco et al (2004); Pasquino et al (2010)], this is not the case for an inertialess Newtonian fluid. Therefore, unless a structure is somehow forced (e.g.…”

Section: Small Amplitude Oscillatory Shearmentioning

confidence: 99%

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Rheology of viscoelastic suspensions of spheres under small and large amplitude oscillatory shear by numerical simulations

D’Avino¹,

Greco²,

Hulsen³

et al. 2013

Journal of Rheology

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The dynamic response of a viscoelastic suspension of spheres under small and large amplitude oscillatory shear is investigated by three-dimensional direct numerical simulations. A sliding triperiodic domain is implemented whereby the computational domain is regarded as the bulk of an infinite suspension. A fictitious domain method is used to manage the particle motion. After the stress field is computed, the bulk properties are recovered by an averaging procedure. The numerical method is validated by comparing the computed linear viscoelastic response of Newtonian and non-Newtonian suspensions with previous theories and simulations. The numerical predictions are in very good quantitative agreement with experimental data for the Newtonian case, whereas deviations are found with respect to some sets of experiments for semidilute and concentrated viscoelastic suspensions. To investigate on such discrepancies, the effect of aggregates in the bulk of the suspension is examined. The simulations show that the presence of structures significantly alters the loss modulus. Such an effect is more pronounced as the volume fraction increases. In this light, the above mentioned disagreement between simulations and data (and among experimental data themselves) can be rationalized, as its origin can be attributed to inhomogeneous particle configurations. For increasing strain amplitudes, both loss and storage moduli depart from the linear viscoelastic values. Although the deviations are qualitatively similar to the large amplitude response of the unfilled suspending matrix, our results for dilute and semidilute suspensions show that the decrease of the moduli is more and more pronounced as the volume fraction is higher. Furthermore, a higher concentration of solid particles reduces the value of strain amplitude such that the nonlinear behavior is observed. Simulations at higher frequencies also correctly capture the overshoot in the loss modulus for intermediate strain amplitudes. Finally, the effect of fluid elasticity on the particle motion is analyzed. The particles are found to move away from their starting positions and the average distance, computed at the beginning of each cycle with respect to the initial configuration, linearly increases with the number of cycles. The change in the microstructure is attributed to the long-range hydrodynamic interactions mediated by fluid viscoelasticit

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Section: Large Amplitude Oscillatory Shearmentioning

confidence: 85%

Section: Small Amplitude Oscillatory Shearmentioning

confidence: 99%

Rheology of viscoelastic suspensions of spheres under small and large amplitude oscillatory shear by numerical simulations

D’Avino¹,

Greco²,

Hulsen³

et al. 2013

Journal of Rheology

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“…This poorly understood phenomenon was already reported in 1977 by Michele et al 2 and confirmed a decade ago by Lyon et al 3 In these studies it was suggested that colloidal alignment appears when the Weissenberg number, defined as the ratio of first normal stress difference to shear stress, is larger than 10. Subsequent work by Scirocco et al 4 and Won and Kim 5 showed that this critical Weissenberg number is not univera) Electronic mail: i.s.santosdeoliveira@utwente.nl. b) Electronic mail: w.j.briels@utwente.nl.…”

Section: Introductionmentioning

confidence: 99%

“…These studies also established that viscoelasticity is not a sufficient condition for structure formation, since alignment is not observed in viscoelastic Boger fluids. 4,5 Instead, these authors suggested that shear-thinning is a necessary condition for shear-induced alignment of spherical particles. The recent work of Pasquino et al 6 on dilute suspensions of hard spheres in a worm-like micellar solution showed the formation of string-like structures at low shear rates and 2D crystals at high shear rates.…”

Section: Introductionmentioning

confidence: 99%

Alignment of particles in sheared viscoelastic fluids

Oliveira

Noort

Padding

et al. 2011

The Journal of Chemical Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Related ArticlesStability of solvated nanosheet in shear flow Appl. Phys. Lett. 97, 214102 (2010) Analysis of the configurational temperature of polymeric liquids under shear and elongational flows using nonequilibrium molecular dynamics and Monte Carlo simulations J. Chem. Phys. 132, 184906 (2010) Dynamics and rheology of wormlike micelles emerging from particulate computer simulations J. Chem. Phys. 129, 074903 (2008) Coarse-grained molecular dynamics simulation on the placement of nanoparticles within symmetric diblock copolymers under shear flow J. Chem. Phys. 128, 164909 (2008) Nonequilibrium molecular dynamics of the rheological and structural properties of linear and branched molecules. Simple shear and poiseuille flows; instabilities and slip J. Chem. Phys. 123, 054907 (2005) Additional information on J. Chem. Phys. We investigate the shear-induced structure formation of colloidal particles dissolved in nonNewtonian fluids by means of computer simulations. The two investigated visco-elastic fluids are a semi-dilute polymer solution and a worm-like micellar solution. Both shear-thinning fluids contain long flexible chains whose entanglements appear and disappear continually as a result of Brownian motion and the applied shear flow. To reach sufficiently large time and length scales in threedimensional simulations with up to 96 spherical colloids, we employ the responsive particle dynamics simulation method of modeling each chain as a single soft Brownian par...

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“…Examples are spherical or rod-like colloids dispersed in polymer solutions or melts, which are exposed to a shear flow [24,25,26,27,28]. Shear flow can induce particle aggregation and alignment in these systems.…”

Section: Introductionmentioning

confidence: 99%

Multiparticle collision dynamics modeling of viscoelastic fluids

Tao

Götze

Gompper

2008

The Journal of Chemical Physics

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In order to investigate the rheological properties of viscoelastic fluids by mesoscopic hydrodynamics methods, we develop a multi-particle collision dynamics (MPC) model for a fluid of harmonic dumbbells. The algorithm consists of alternating streaming and collision steps. The advantage of the harmonic interactions is that the integration of the equations of motion in the streaming step can be performed analytically. Therefore, the algorithm is computationally as efficient as the original MPC algorithm for Newtonian fluids. The collision step is the same as in the original MPC method. All particles are confined between two solid walls moving oppositely, so that both steady and oscillatory shear flows can be investigated. Attractive wall potentials are applied to obtain a nearly uniform density everywhere in the simulation box. We find that both in steady and oscillatory shear flow, a boundary layer develops near the wall, with a higher velocity gradient than in the bulk. The thickness of this layer is proportional to the average dumbbell size. We determine the zero-shear viscosities as a function of the spring constant of the dumbbells and the mean free path. For very high shear rates, a very weak "shear thickening" behavior is observed. Moreover, storage and loss moduli are calculated in oscillatory shear, which show that the viscoelastic properties at low and moderate frequencies are consistent with a Maxwell fluid behavior. We compare our results with a kinetic theory of dumbbells in solution, and generally find good agreement.

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Effect of the viscoelasticity of the suspending fluid on structure formation in suspensions

Cited by 122 publications

References 31 publications

Rheology of viscoelastic suspensions of spheres under small and large amplitude oscillatory shear by numerical simulations

Rheology of viscoelastic suspensions of spheres under small and large amplitude oscillatory shear by numerical simulations

Alignment of particles in sheared viscoelastic fluids

Multiparticle collision dynamics modeling of viscoelastic fluids

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