Article
Physics, Fluids & Plasmas
Vincent Demery, Andrea Gambassi
Summary: This passage describes the motion of a colloidal probe in a complex fluid and the nonlinearity of its dynamics. By calculating the kurtosis of the probe's displacement, it is found that the change in kurtosis can reveal the nonlinear characteristics of the dynamics.
Article
Physics, Multidisciplinary
Matthew Macaulay, Pierre Rognon
Summary: This study examines the distribution of contact forces in dense granular flows and finds that higher magnitude contact forces exist in faster flows with stiffer grains. A proposed physical mechanism explains this rate-dependent force transmission, establishing a relationship between contact forces and grain velocities. This analysis provides a starting point for unifying a range of continuum models based on either contact forces or grain velocities.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
M. Reza Shaebani, Janos Torok, Maniya Maleki, Mahnoush Madani, Matt Harrington, Allyson Rice, Wolfgang Losert
Summary: The research found that the flow profile is independent of gravity for geometries with a free top surface; however, under a confining pressure or if the sheared layer withstands the weight of the upper layers, increasing gravity promotes the transition from closed shear zones to open ones. The center position and width of the shear zone, as well as the axial angular velocity at the top surface, follow universal scaling laws.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mechanics
Peter Varun Dsouza, Prabhu R. Nott
Summary: Granular materials exhibit unique features such as dilatancy and large-scale secondary flow driven by a combination of shear and gravity. The height at which the material is filled in a primary flow determines both the shape of the shearing region and the form of the secondary flow, indicating a close coupling between the two phenomena. Unlike fluid instabilities driven by inertia, the secondary flow in granular materials occurs at low shear rates and is an integral part of the kinematic response.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Riccardo Artoni, Michele Larcher, James T. Jenkins, Patrick Richard
Summary: This study reports measurements of self-diffusion coefficients in collisional shearing flows of frictional, inelastic spheres, highlighting the impact of solid volume fractions on diffusivity. Comparison with empirical scaling and kinetic theory predictions reveals discrepancies, suggesting the need for further investigation into the diffusion behavior of such systems.
Article
Physics, Multidisciplinary
Kasra Farain, Daniel Bonn
Summary: The question of when dense granular materials start to flow under stress has not been resolved. A simple equation based on frictional aging of the granular packing is developed and tested, resulting in a nonmonotonic stress-strain relation independent of shear rate. This relation helps understand the quasistatic deformations and solid-to-liquid transition of aging granular media. It also explains the flow history dependence of mechanical properties and sensitivity to initial preparation of granular media.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Seongmin Kim, Ken Kamrin
Summary: We propose a constitutive equation for three-dimensional granular flows based on discrete element method simulations. By considering second-order Rivlin-Ericksen tensors, we extend an existing granular temperature-sensitive rheological model to capture non-local phenomena, normal stress differences, and secondary flows. Three model parameters are calibrated using the inertial number and a dimensionless granular temperature. The model is validated through finite difference method simulations of inclined chute flows, successfully predicting the velocity and stress fields, including previously unaccounted for secondary vortical flows and slow creeping zones.
FRONTIERS IN PHYSICS
(2023)
Article
Engineering, Geological
Tibing Xu, S. Samuel Li
Summary: In this study, a non-local partial Peridynamic mesh-free incompressible method is proposed for simulating dry dense granular flows. The method incorporates Peridynamic theory in a predictor-and-corrector time splitting scheme to solve an integrated momentum equation. The proposed method is validated through simulations of various granular flow configurations, showing good agreement with analytical solutions and experimental observations.
Article
Chemistry, Physical
Farnaz Fazelpour, Karen E. Daniels
Summary: In this paper, the influence of boundary shape, particularly roughness, on wall slip in dense granular flows is investigated. Experiments are conducted on a quasi-2D annular shear cell to examine the influence of different boundary properties. It is found that the full flow profile can be accurately captured using a single set of model parameters, with the wall slip velocity set by direct observation. The measurements also reveal a universal relationship between dimensionless fluidity and velocity.
Article
Physics, Fluids & Plasmas
Meng Liu, Christoph R. Muller
Summary: The lift force model for intruders in dense, granular shear flows takes into account granular temperature, pressure differences, and density differences between the intruder and the bed particles. The model accurately predicts and explains the behavior of intruders in shear flows.
Article
Engineering, Chemical
T. M. Povall, I Govender, A. T. McBride
Summary: A novel 3D measurement method was proposed to test the compressibility and isotropy of rotating drum flows using the DEM with mu(I) rheology. The study found that compressibility enhances isotropy and statistically better fits were obtained when using an empirically-derived friction law. However, all models failed to capture behavior at very low inertial numbers.
Article
Physics, Multidisciplinary
Kuniyasu Saitoh, Takeshi Kawasaki
Summary: We investigated the characteristics of two-dimensional dense granular flows using molecular dynamics simulations. Our results show that the shear-induced diffusion of granular particles exhibits different behaviors at different time scales, and is also influenced by the contact damping model.
FRONTIERS IN PHYSICS
(2022)
Article
Mechanics
T. Trewhela, C. Ancey, J. M. N. T. Gray
Summary: Particles of differing sizes are prone to segregation in shear driven flows, affecting industrial processes and hazardous geophysical mass flows. Refractive-index matched oscillatory shear-cell experiments have identified a unifying scaling law for segregation velocity in extreme cases.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
G. C. Yang, Y. J. Huang, Y. Lu, C. Y. Kwok, Y. D. Sobral, Q. H. Yao
Summary: This research treats granular materials as a continuum and uses the lattice Boltzmann method to simulate their flow behavior. A novel frictional boundary condition is introduced to accurately describe the stick-slip phenomenon at the boundaries. The numerical model shows good agreement with analytical solutions and can predict various granular flow scenarios.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Francesco Tosto, Claudio Lettieri, Matteo Pini, Piero Colonna
Summary: The study of paradigmatic compressible one-dimensional flows provides insights into the loss mechanisms of fluid machinery components in power and propulsion systems. The research shows that in Rayleigh flows, energy is converted, while entropy is generated in Fanno flows due to friction. Molecular complexity and thermodynamic state significantly impact the performance of the working fluid.
Article
Instruments & Instrumentation
S. Aumaitre, R. P. Behringer, A. Cazaubiel, E. Clement, J. Crassous, D. J. Durian, E. Falcon, S. Fauve, D. Fischer, A. Garcimartin, Y. Garrabos, M. Hou, X. Jia, C. Lecoutre, S. Luding, D. Maza, M. Noirhomme, E. Opsomer, F. Palencia, T. Poeschel, J. Schockmel, M. Sperl, R. Stannarius, N. Vandewalle, P. Yu
REVIEW OF SCIENTIFIC INSTRUMENTS
(2018)
Article
Physics, Fluids & Plasmas
Benoit Vincenti, Carine Douarche, Eric Clement
PHYSICAL REVIEW FLUIDS
(2018)
Article
Physics, Fluids & Plasmas
Adama Creppy, Eric Clement, Carine Douarche, Maria Veronica D'Angelo, Harold Auradou
PHYSICAL REVIEW FLUIDS
(2019)
Article
Physics, Multidisciplinary
Shang Zhang, Leyou Zhang, Mehdi Bouzid, D. Zeb Rocklin, Emanuela Del Gado, Xiaoming Mao
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Arnold J. T. M. Mathijssen, Nuris Figueroa-Morales, Gaspard Junot, Eric Clement, Anke Lindner, Andreas Zoettl
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Benoit Vincenti, Gabriel Ramos, Maria Luisa Cordero, Carine Douarche, Rodrigo Soto, Eric Clement
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Vincent A. Martinez, Eric Clement, Jochen Arlt, Carine Douarche, Angela Dawson, Jana Schwarz-Linek, Adama K. Creppy, Viktor Skultety, Alexander N. Morozov, Harold Auradou, Wilson C. K. Poon
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Physics, Multidisciplinary
Nuns Figueroa-Morales, Rodrigo Soto, Gaspard Junot, Thierry Darnige, Carine Douarche, Vincent A. Martinez, Anke Lindner, Eric Clement
Article
Multidisciplinary Sciences
Nuris Figueroa-Morales, Aramis Rivera, Rodrigo Soto, Anke Lindner, Ernesto Altshuler, Eric Clement
Article
Multidisciplinary Sciences
A. Allard, M. Bouzid, T. Betz, C. Simon, M. Abou-Ghali, J. Lemiere, F. Valentino, J. Manzi, F. Brochard-Wyart, K. Guevorkian, J. Plastino, M. Lenz, C. Campillo, C. Sykes
Article
Multidisciplinary Sciences
Guangyin Jing, Andreas Zoettl, Eric Clement, Anke Lindner
Article
Physics, Multidisciplinary
Minaspi Bantawa, Bavand Keshavarz, Michela Geri, Mehdi Bouzid, Thibaut Divoux, Gareth H. McKinley, Emanuela Del Gado
Summary: Soft particulate gels consist of a small amount of particulate matter dispersed in a continuous fluid phase. The mechanical response and gel elasticity are determined by the particle volume fraction. However, the diverse range of functional dependencies reported experimentally has made it difficult to identify general scaling laws.
Article
Physics, Multidisciplinary
Nina Javerzat, Mehdi Bouzid
Summary: This study investigates the rigidity transition phenomenon in disordered media when the density of microscopic components is increased. The researchers found that at the critical point, random rigid clusters exhibit fractal properties and conformal invariance, and unexpected similarities exist between the statistical properties of random clusters in connectivity and rigidity percolation.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Claudia Ferreiro-Cordova, Emanuela Del Gado, Giuseppe Foffi, Mehdi Bouzid
Article
Physics, Multidisciplinary
Gaspard Junot, Nuris Figueroa-Morales, Thierry Darnige, Anke Lindner, Rodrigo Soto, Harold Auradou, Eric Clement