scholarly journals Shear thickening behavior in dense repulsive and attractive suspensions of hard spheres

Soft Matter ◽  
2021 ◽  
Author(s):  
Vikram Rathee ◽  
Alessandro Monti ◽  
Marco Edoardo Rosti ◽  
Amy Q Shen
Keyword(s):  
Flow Curve ◽  
Hard Spheres ◽  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Thickening Behavior ◽  
The Stability

Shear thickening in stable dense colloidal suspensions is a reversible phenomenon and no hysteresis is observed in the flow curve measurements. However, a reduction in the stability of colloids promotes...

scholarly journals Shear-Thickening Behavior of Concentrated Monodispersed Colloidal Suspensions

2019 ◽  
Vol 47 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Hiroshi Nakamura ◽  
Soichiro Makino ◽  
Masahiko Ishii
Keyword(s):  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Thickening Behavior

scholarly journals Kinetic theory of discontinuous rheological phase transition for a dilute inertial suspension

2019 ◽  
Vol 2019 (8) ◽  
Author(s):  
Hisao Hayakawa ◽  
Satoshi Takada
Keyword(s):  
Kinetic Theory ◽  
Flow Curve ◽  
Hard Spheres ◽  
Shear Thickening ◽  
Attractive Interaction ◽  
Negative Slope ◽  
Kinetic Temperature ◽  
Dilute Suspensions ◽  
Langevin Simulation ◽  
Elastic Particles

Abstract A kinetic theory for a dilute inertial suspension under a simple shear is developed. With the aid of the corresponding Boltzmann equation, it is found that the flow curves (the relations between the stress and the strain rate) exhibit the crossovers from the Newtonian to the Bagnoldian for a granular suspension and from the Newtonian to a fluid having a viscosity proportional to the square of the shear rate for a suspension consisting of elastic particles, respectively. The existence of the negative slope in the flow curve directly leads to a discontinuous shear thickening (DST). This DST corresponds to the discontinuous transition of the kinetic temperature between a quenched state and an ignited state. The results of the event-driven Langevin simulation of hard spheres perfectly agree with the theoretical results without any fitting parameter. The introduction of an attractive interaction between particles is also another source of the DST in dilute suspensions. Namely, there are two discontinuous jumps in the flow curve if the suspension particles have the attractive interaction.

Dynamic simulation of shear thickening in concentrated colloidal suspensions

1997 ◽  
Vol 353 ◽  
pp. 1-30 ◽  
Author(s):  
D. I. DRATLER ◽  
W. R. SCHOWALTER ◽  
R. L. HOFFMAN
Keyword(s):  
Shear Rate ◽  
Hard Spheres ◽  
Shear Thickening ◽  
Colloidal Suspensions ◽  
System Size ◽  
Linear Instability ◽  
Computational Domain ◽  
Stokesian Dynamics ◽  
Rigid Spheres ◽  
Critical Shear Rate

Stokesian Dynamics has been used to investigate the origins of shear thickening in concentrated colloidal suspensions. For this study, we considered a monolayer suspension composed of charge-stabilized non-Brownian monosized rigid spheres dispersed at an areal fraction of ϕa=0.74 in a Newtonian liquid. The suspension was subjected to a linear shear field. In agreement with established experimental data, our results indicate that shear thickening in this system is associated with an order–disorder transition of the suspension microstructure. Below the critical shear rate at which this transition occurs, the suspension microstructure consists of two-dimensional analogues of experimentally observed sliding layer configurations. Above this critical shear rate, suspensions are disordered, contain particle clusters, and exhibit viscosities and microstructures characteristic of suspensions of non-Brownian hard spheres. In addition, suspensions possessing the sliding layer microstructure at the beginning of supercritical shearing tend to retain this microstructure for a period of time before disordering. The onset of this disorder is due to the formation of particle doublets within the suspension. Once formed, these doublets rotate, due to the bulk motion, and disrupt the long-range order of the suspension. The cross-stream component of the centre-to-centre separation vector associated with the two particles forming a doublet, which is zero when the doublet is perfectly aligned with the bulk velocity vector, grows exponentially with time. This strongly suggests that the evolution of these doublets is due to a change in the stability of the sliding layer configurations, with this type of ordered microstructure being linearly unstable above a critical shear rate. This contention is supported by results of a stability analysis. The analysis shows that a single string of particles is subject to a linear instability leading to the formation of particle doublets. Simulations were repeated with different numbers of particles in the computational domain, with the results found to be qualitatively independent of system size.

Stability of Shear-Thickening Liquids Between Rotating Cylinders

2010 ◽  
Author(s):  
Nariman Ashrafi ◽  
Habib Karimi Haghighi
Keyword(s):  
Couette Flow ◽  
Dynamical Behavior ◽  
Shear Thickening ◽  
Shear Thinning ◽  
Taylor Vortex ◽  
Shear Dependent Viscosity ◽  
Shear Thinning Fluids ◽  
Shear Thickening Fluids ◽  
The Stability ◽  
Dependent Viscosity

The effects of nonlinearities on the stability are explored for shear thickening fluids in the narrow-gap limit of the Taylor-Couette flow. It is assumed that shear-thickening fluids behave exactly as opposite of shear thinning ones. A dynamical system is obtained from the conservation of mass and momentum equations which include nonlinear terms in velocity components due to the shear-dependent viscosity. It is found that the critical Taylor number, corresponding to the loss of stability of Couette flow becomes higher as the shear-thickening effects increases. Similar to the shear thinning case, the Taylor vortex structure emerges in the shear thickening flow, however they quickly disappear thus bringing the flow back to the purely azimuthal flow. Naturally, one expects shear thickening fluids to result in inverse dynamical behavior of shear thinning fluids. This study proves that this is not the case for every point on the bifurcation diagram.

scholarly journals Stability, rheological property and oil-displacement mechanism of a dispersed low-elastic microsphere system for enhanced oil recovery

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8118-8130 ◽  
Author(s):  
Hongbin Yang ◽  
Wanli Kang ◽  
Hairong Wu ◽  
Yang Yu ◽  
Zhou Zhu ◽  
...  
Keyword(s):  
Rheological Property ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Shear Thickening ◽  
Microstructure Change ◽  
Displacement Mechanism ◽  
Oil Displacement ◽  
Internal Forces ◽  
Thickening Behavior

The dispersed low-elastic microsphere system shows shear-thickening behavior because of the microstructure change and the interaction of internal forces.

scholarly journals The Effect of Rheology of Viscoelastic Polymer on Pressure Transient Response in Near-Wellbore Regions

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jia Zhang ◽  
Shiqing Cheng ◽  
Jie Zhan ◽  
Qi Han
Keyword(s):  
Shear Thickening ◽  
Shear Thinning ◽  
Polymer Flooding ◽  
High Shear ◽  
Pressure Data ◽  
Transient Pressure ◽  
Pressure Derivative ◽  
Shear Rates ◽  
Viscoelastic Polymer ◽  
Thickening Behavior

Viscoelastic polymer solution shows shear thinning behavior at low shear rates and shear thickening behavior at high shear rates in reservoirs. However, models that ignored shear thickening behavior were commonly employed to interpret transient pressure data derived from tested wells in viscoelastic polymer flooding systems; although, viscoelastic polymer solutions show shear thickening behavior in the near-wellbore region due to high shear rate. To better characterize the oilfield with pressure transient analysis in viscoelastic polymer flooding systems, we developed a numerical model that takes into account both shear thinning behavior and shear thickening behavior. A finite volume method was employed to discretize partially differential flow equations in a hybrid grid system including PEBI mesh and Cartesian grid, and the Newton-Raphson method was used to solve the fully implicit nonlinear system. To illustrate the significance of our model, we compared our model with a model that ignores the shear thickening behavior by graphing their solutions on log-log plots. In the flow regime of near-wellbore damage, the pressure derivative computed by our model is distinctly larger than that computed by the model ignoring shear thickening behavior. Furthermore, the effect of shear thickening behavior on pressure derivative differs from that of near-wellbore damage. We then investigated the influence of shear thickening behavior on pressure derivative with different polymer injection rates, injection rates, and permeabilities. The results can provide a benchmark to better estimate near-wellbore damage in viscoelastic polymer flooding systems. Besides, we demonstrated the applicability and accuracy of our model by interpreting transient pressure data from a field case in an oilfield with viscoelastic polymer flooding treatments.

scholarly journals Observation of transition cascades in sheared liquid crystalline polymers

Soft Matter ◽  
2020 ◽  
Vol 16 (16) ◽  
pp. 3891-3901 ◽  
Author(s):  
Ryan J. Fox ◽  
M. Gregory Forest ◽  
Stephen J. Picken ◽  
Theo J. Dingemans
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Shear Thickening ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Nematic Director ◽  
Thickening Behavior

We observe anomalous shear thickening behavior of a lyotropic liquid crystalline polymer due to the dynamics of the nematic director.

scholarly journals Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions

2015 ◽  
Vol 115 (22) ◽  
Author(s):  
Neil Y. C. Lin ◽  
Ben M. Guy ◽  
Michiel Hermes ◽  
Chris Ness ◽  
Jin Sun ◽  
...  
Keyword(s):  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Continuous Shear
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