scholarly journals Controlling shear jamming in dense suspensions via the particle aspect ratio

Soft Matter ◽  
2019 ◽  
Vol 15 (18) ◽  
pp. 3649-3654 ◽  
Author(s):  
Nicole M. James ◽  
Huayue Xue ◽  
Medha Goyal ◽  
Heinrich M. Jaeger
Keyword(s):  
Aspect Ratio ◽  
Shear Thickening ◽  
Dense Suspensions ◽  
Shear Jamming ◽  
Particle Aspect Ratio

Dense suspensions of particles in a liquid exhibit rich, non-Newtonian behaviors such as shear thickening (ST) and shear jamming (SJ).

scholarly journals Orientational arrest in dense suspensions of elliptical particles under oscillatory shear flows

2021 ◽  
Author(s):  
Zakiyeh Yousefian ◽  
Martin Trulsson
Keyword(s):  
Aspect Ratio ◽  
Shear Flows ◽  
Oscillatory Shear ◽  
Large Strains ◽  
Nematic Order ◽  
Rheological Response ◽  
Lower Viscosity ◽  
Dense Suspensions ◽  
Elliptical Particles ◽  
Shear Jamming

Abstract We study the rheological response of dense suspensions of elliptical particles, with an aspect ratio equal to 3, under oscillatory shear flows and imposed pressure by numerical simulations. Like for the isotropic particles, we find that the oscillatory shear flows respect the Cox-Merz rule at large oscillatory strains but differ at low strains, with a lower viscosity than the steady shear and higher shear jamming packing fractions. However, unlike the isotropic cases (i.e., discs and spheres), frictionless ellipses get dynamically arrested in their initial orientational configuration at small oscillatory strains. We illustrate this by starting at two different configurations with different nematic order parameters and the average orientation of the particles. Surprisingly, the overall orientation in the frictionless case is uncoupled to the rheological response close to jamming, and the rheology is only controlled by the average number of contacts and the oscillatory strain. Having larger oscillatory strains or adding friction does, however, help the system escape these orientational arrested states, which are evolving to a disordered state independent of the initial configuration at low strains and ordered ones at large strains.

scholarly journals Viscous-like forces control the impact response of shear-thickening dense suspensions

2021 ◽  
Vol 923 ◽  
Author(s):  
Marc-Andre Brassard ◽  
Neil Causley ◽  
Nasser Krizou ◽  
Joshua A. Dijksman ◽  
Abram. H. Clark
Keyword(s):  
Shear Thickening ◽  
Impact Response ◽  
Dense Suspensions ◽  
The Impact

Abstract

A new method for determining platy particle aspect ratio: A kaolinite case study

2014 ◽  
Vol 97-98 ◽  
pp. 125-131 ◽  
Author(s):  
Hongfei Cheng ◽  
Zhiliang Zhang ◽  
Qinfu Liu ◽  
Joseph Leung
Keyword(s):  
Aspect Ratio ◽  
New Method ◽  
Particle Aspect Ratio

scholarly journals Influence of particle aspect ratio and ability to aggregate on electrical conductivity of fiber-forming polymer composites

2020 ◽  
Vol 1 (3) ◽  
pp. 99-107
Author(s):  
Ekaterina S. Tsobkallo ◽  
Olga A. Moskalyuk ◽  
Vladimir E. Yudin ◽  
Andrey N. Aleshin
Keyword(s):  
Electrical Conductivity ◽  
Aspect Ratio ◽  
Polymer Composites ◽  
Particle Aspect Ratio

scholarly journals Shear Thickening and Jamming of Dense Suspensions: The “Roll” of Friction

2020 ◽  
Vol 124 (24) ◽  
Author(s):  
Abhinendra Singh ◽  
Christopher Ness ◽  
Ryohei Seto ◽  
Juan J. de Pablo ◽  
Heinrich M. Jaeger
Keyword(s):  
Shear Thickening ◽  
Dense Suspensions

Simulation By Cellular Automata Of The (Re) Crystallization Of A Matrix Containing An Inert Second Phase

1993 ◽  
Vol 321 ◽  
Author(s):  
C. F. Pezzee ◽  
D. C. Dunand
Keyword(s):  
Aspect Ratio ◽  
Cellular Automata ◽  
Single Phase ◽  
Second Phase ◽  
Particle Fraction ◽  
Aspect Ratios ◽  
Inert Particles ◽  
Mean Size ◽  
Particle Area ◽  
Particle Aspect Ratio

ABSTRACTTwo-dimensional cellular automata simulations were carried out to study the case of the crystallization (or recrystallization) of a matrix containing an inert, immobile second phase. A range of particle area fractions and aspect ratios were investigated under continuous grain nucleation conditions, assuming that the effect of particles is limited to geometric impingement upon contact with the growing grains. Systematic deviations from the classical Johnson, Mehl, Avrami, Kolmogo-rov equation for single-phase materials are observed with increasing particle aspect ratio and particle fraction. Inert particles also influence both mean size and mean aspect ratio of the final grains.

Impact of Altering Aspect Ratio of the Loading Particles on a Suspension’s Thermal Conductivity

2008 ◽  
Author(s):  
A. S. Cherkasova ◽  
J. W. Shan
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Silicon Carbide ◽  
Aspect Ratio ◽  
Effective Medium Theory ◽  
Detailed Comparison ◽  
Interfacial Resistance ◽  
Micro Particles ◽  
Particle Aspect Ratio

It has been recognized that heat-transfer fluids used to convey thermal energy produced by one device to another can exhibit significant increases in thermal conductivity with the addition of highly conductive particles. Suspensions of nano- and micro-particles have attracted the most recent interest because of their enhanced stability against sedimentation, reduction in potential for clogging a flow system, as well as the tantalizing possibility of unexpected enhancements in thermal conductivity that have been reported in some experiments. Among various suspensions, considerable attention has focused on those containing large-aspect-ratio particles, such as carbon nanotubes. Although recent experiments have demonstrated enormous heat-transfer enhancements in these fluids, such increases were reportedly not in agreement with existing macroscale theories [1–3]. In this research we report on an experimental study of the effects of particle aspect ratio on the effective thermal conductivity of micro- and nano-particle suspensions. The influence of particle aspect ratio on the thermal properties of suspensions was first studied in dispersions of micron-sized, silicon-carbide particles with varying aspect ratio. To carry out a detailed comparison with theoretical predictions, particle aspect ratio and size distributions were measured. It is shown that the conductivity of the silicon-carbide suspensions can be quantitatively predicted by an effective-medium theory (EMT), provided the volume-weighted aspect ratio of the particles is used. The particle-aspect-ratio effect was further studied in the suspensions of multi-walled carbon nanotubes. Experimental data on the thermal conductivity of nanotube suspensions could also be interpreted in terms of the aspect-ratio dependence predicted by EMT if the additional nanoscale effect of interfacial resistance was considered.

scholarly journals Shear jamming and fragility in dense suspensions

2019 ◽  
Vol 21 (3) ◽  
Author(s):  
Ryohei Seto ◽  
Abhinendra Singh ◽  
Bulbul Chakraborty ◽  
Morton M. Denn ◽  
Jeffrey F. Morris
Keyword(s):  
Dense Suspensions ◽  
Shear Jamming

Effect of particle breakage conditions on child particle aspect ratio

2019 ◽  
Vol 355 ◽  
pp. 564-572 ◽  
Author(s):  
Priscilla J. Hill ◽  
Sheena M. Reeves
Keyword(s):  
Aspect Ratio ◽  
Particle Breakage ◽  
Particle Aspect Ratio

scholarly journals Force transmission and the order parameter of shear thickening

Soft Matter ◽  
2019 ◽  
Vol 15 (33) ◽  
pp. 6650-6659 ◽  
Author(s):  
Romain Mari ◽  
Ryohei Seto
Keyword(s):  
Equation Of State ◽  
Statistical Models ◽  
Order Parameter ◽  
Statistical Physics ◽  
Suspended Particle ◽  
Shear Thickening ◽  
Force Transmission ◽  
Particle Properties ◽  
Dense Suspensions ◽  
Force Propagation

Statistical models of force propagation can predict the equation of state of the shear thickening transition of dense suspensions, based on the suspended particle properties. This lays the foundations for a statistical physics of shear thickening.

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