Article
Physics, Fluids & Plasmas
Zhouyang Ge, Gwynn J. Elfring
Summary: This article numerically investigates the rheology of noncolloidal suspensions under cyclic shear and finds a dependence of shear stress and second normal stress difference on strain amplitude. The study also explains the connection between these rheological changes and reversible-irreversible transition based on flow-induced mechanisms and underlying microstructure.
Article
Mechanics
Monsurul Khan, Rishabh V. More, Arezoo M. Ardekani
Summary: 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. The model is calibrated using data from direct numerical simulation and accurately predicts experimental measurements. The model quantitatively reproduces the experimentally observed shear thinning by using a friction coefficient decreasing with the normal load between the fibers. The findings of this study can be used to design suspension rheology in various applications by tuning the fiber size and volume fraction.
Article
Mechanics
Regis Turuban, Henri Lhuissier, Bloen Metzger
Summary: This paper investigates the effects of complex advection in a sheared suspension on the mixing process, showing that the stretching, folding, and overlapping of fluid at different timescales have a significant impact on mixing, eventually leading to the homogenization of dye distribution.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
Zhouyang Ge, Raffaella Martone, Luca Brandt, Mario Minale
Summary: Recent experiments have shown that slowly sheared noncolloidal particle suspensions exhibit rate-dependent complex viscosities in oscillatory shear, despite having a constant relative viscosity in steady shear. This behavior is attributed to van der Waals attraction and is accompanied by power-law reductions in shear at volume fractions between 20-50%, with a maximum exponent at 40%.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Mechanics
Yuan Lin, Ying Wang, Zixin Weng, Dingyi Pan, Jiawang Chen
Summary: The presence of bubbles in non-colloidal suspensions significantly affects the shear thinning behavior, with large bubbles enhancing shear thinning and nano-bubbles suppressing it. Additionally, nano-bubbles influence the particle organization behavior, leading to a larger critical strain for the finish of the organization process. Therefore, a degassing process is essential to obtain reliable rheological properties of the two-phase suspension system.
Article
Engineering, Chemical
J. W. S. McCullough, L. Laniewski-Wollk, S. M. Aminossadati, C. R. Leonardi
Summary: This paper proposes a numerical coupling method for resolving particle suspensions exposed to thermal influences, and validates the model through the study of suspensions' relative viscosity. Results show significant impact of temperature on suspension flow behavior, and future work will focus on modifying particle properties for industrial improvements.
Article
Mechanics
B. Vowinckel, E. Biegert, E. Meiburg, P. Aussillous, E. Guazzelli
Summary: By comparing simulation data with experimental data, we have identified the rheological behavior of sheared sediment beds in pressure-driven flow and discovered good agreement in rheological properties between dense and dilute regimes. A critical particle volume fraction of 0.3 was found to separate the two regions and the effective viscosity obeyed the Einstein relation in the dilute regime.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Jiahui Hao, Yu Guo
Summary: This study investigates the flow of frictional, Platonic solid-shaped particles on inclined planes using the discrete element method, and analyzes the effects of particle angular shape on rheological properties. It finds that angular particles have higher shear stresses and experience rapid surges in the coordination number and solid-phase stresses at a smaller critical solid volume fraction. Additionally, by applying a specific rolling friction to spherical particles, their rheological properties can mimic those of angular particles.
Article
Multidisciplinary Sciences
Yixuan Xu, Thomas G. Mason
Summary: The jamming behavior of systems with complex size distributions is studied using concentrated, disordered binary mixtures of nanoscale and microscale oil-in-water emulsions. Experimental results suggest the presence of more complex collective behavior in extremely bidisperse systems, including nanodroplet jamming and depletion attractions between microscale droplets induced by nanoscale droplets.
Article
Physics, Multidisciplinary
Brandon R. Ferrer, Juan Ruben Gomez-Solano, Alejandro Arzola
Summary: Thermally activated transitions are commonly found in nature, and this study provides the first direct observations of a Brownian bead transitioning between the wells of a bistable optical potential in a viscoelastic fluid. The study shows a significant increase in transition rates compared to those in a Newtonian fluid, attributed to the relaxation of the fluid during particle crossing events.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mechanics
Benjamin Marchetti, Laurence Bergougnoux, Elisabeth Guazzelli
Summary: The study investigates the coupling between particle-particle and particle-fluid interactions by examining the sedimentation of a cloud of spheres in a model cellular flow consisting of counter-rotating vortices. By comparing experiments and point-particle simulations, the dynamics of clouds settling in this vortical flow are explored.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
John T. Antolik, Amanda Howard, Fernando Vereda, Nikolay Ionkin, Martin Maxey, Daniel M. Harris
Summary: The irreversible behavior of highly confined non-Brownian suspension of particles in a Newtonian fluid at low Reynolds number is studied experimentally and numerically. The experiment shows that the particles quickly separate to the walls in the small dimension and feature shear-induced migration in the large dimension. Numerical simulations confirm the experimental observations. These findings are important for understanding the behavior of highly confined suspensions.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Ali Yousefi, Pedro Costa, Francesco Picano, Luca Brandt
Summary: We investigated the dynamics of finite-size neutrally buoyant rigid spherical particles in channel flow and analyzed the connection between momentum transfer mechanisms and the bulk flow properties in the highly inertial regime. Our simulation results showed that the particle interactions are highly inhomogeneous and depend on the distance from the wall. In dense conditions and moderate Reynolds numbers, the particle-induced stresses dominate the dynamics, while turbulent stresses become more prominent at higher Reynolds numbers. This shift is associated with a reduced particle migration toward the channel core, which decreases the importance of particle-induced stress and increases turbulent activity.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Catherine Kamal, Simon Gravelle, Lorenzo Botto
Summary: This article focuses on the orientational dynamics of thin rigid platelets in shear flow, solving the Fokker-Plank equation and conducting boundary integral simulations for analysis. A threshold Peclet number Pe(c) is quantified, above which alignment occurs, and there is a regime where Brownian fluctuations can break alignment with rotation period dependent on the slip length.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Geological
Usman Ali, Mamoru Kikumoto, Ying Cui, Matteo Ciantia, Marco Previtali
Summary: In this study, biaxial shearing tests were conducted on assemblies of dual-sized circular particles at different confining pressures. It was found that rotations occur in granular materials subjected to external loads or displacements. The rotations are more significant within the shear band and are influenced by the connectivity of particles. The rotational behavior of circular particles is not significantly affected by confining pressures.
Editorial Material
Computer Science, Interdisciplinary Applications
Taehun Lee, Yiannis Andreopoulos, Jeffrey F. Morris, Li-Shi Luo, Manfred Krafczyk
COMPUTERS & FLUIDS
(2016)
Article
Mechanics
Jeffrey F. Morris
JOURNAL OF FLUID MECHANICS
(2016)
Article
Mechanics
Ehssan Nazockdast, Jeffrey F. Morris
JOURNAL OF RHEOLOGY
(2016)
Article
Mechanics
Chaiwut Gamonpilas, Jeffrey F. Morris, Morton M. Denn
JOURNAL OF RHEOLOGY
(2016)
Article
Mechanics
Stephanie Marenne, Jeffrey F. Morris, David R. Foss, John F. Brady
JOURNAL OF RHEOLOGY
(2017)
Article
Mechanics
Stephanie Marenne, Jeffrey F. Morris
JOURNAL OF RHEOLOGY
(2017)
Article
Chemistry, Physical
Sidhant Pednekar, Jaehun Chun, Jeffrey F. Morris
Article
Energy & Fuels
Amit Ahuja, Anam Iqbal, Mohsin Iqbal, Jae W. Lee, Jeffrey F. Morris
Article
Mechanics
Sidhant Pednekar, Jaehun Chun, Jeffrey F. Morris
JOURNAL OF RHEOLOGY
(2018)
Article
Mechanics
Abhinendra Singh, Romain Mari, Morton M. Denn, Jeffrey F. Morris
JOURNAL OF RHEOLOGY
(2018)
Article
Mechanics
Madhu V. Majji, Jeffrey F. Morris
Review
Chemistry, Physical
Morton M. Denn, Jeffrey F. Morris, Daniel Bonn
Article
Physics, Multidisciplinary
Jetin E. Thomas, Kabir Ramola, Abhinendra Singh, Romain Mari, Jeffrey F. Morris, Bulbul Chakraborty
PHYSICAL REVIEW LETTERS
(2018)
Article
Multidisciplinary Sciences
Olivier Liot, Akash Singh, Patrice Bacchin, Paul Duru, Jeffrey F. Morris, Pierre Joseph
SCIENTIFIC REPORTS
(2018)
Article
Mechanics
Madhu V. Majji, Sanjoy Banerjee, Jeffrey F. Morris
JOURNAL OF FLUID MECHANICS
(2018)