Jamming in granular shear flows of frictional, polydisperse cylindrical particles

Hao, Jiahui; Li, Yanjie; Liu, Yi; Curtis, Jennifer; Guo, Yu

doi:10.1016/j.apt.2021.08.024

Cited by 12 publications

(7 citation statements)

References 45 publications

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“…Granular temperature [ 38 ] T p is calculated to describe the fluctuation of translational velocities of the elongated particles in the cup, as shown in Figure 11 . The granular temperature of all particles in the cup can be defined as follows:

in which

, and

is the fluctuating velocities of the particles.…”

Section: Resultsmentioning

confidence: 99%

“…The orientational order of particles can be monitored by diagonalization of the symmetric traceless order tensor Q [ 38 ], as follows:

where

is the unit vector along the major axis of the elongated particle

among all N particles. The largest eigenvalue of

is the primary order parameter S r , which quantifies the degree of alignment.…”

Section: Resultsmentioning

confidence: 99%

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3D DEM Simulations and Experiments on Spherical Impactor Penetrating into the Elongated Particles

Hua

et al. 2023

Materials

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In this study, a brass or glass spherical impactor vertically penetrating into a granular bed composed of mono-sized spherical or elongated particles was simulated with three-dimensional (3D) discrete element method (DEM). Good agreement of the particle masses in the cup before and after penetration can be found in the simulations and experiments. The effects of particle length (Lp), friction coefficient, and particle configuration on the penetration depth of the impactor, ejecta mass, and solid volume fraction describing the response of the granular bed are discussed. The penetration depth is negatively correlated with Lp as the corresponding solid volume fraction of the granular bed decreases. A smaller friction coefficient leads to a larger penetration depth of the impactor and more ejection of particles. When the impactor is penetrating the Lp = 10 mm elongated particles, the penetration depth is negatively correlated to the order parameter and solid volume fraction.

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in which

, and

is the fluctuating velocities of the particles.…”

Section: Resultsmentioning

confidence: 99%

“…The orientational order of particles can be monitored by diagonalization of the symmetric traceless order tensor Q [ 38 ], as follows:

where

is the unit vector along the major axis of the elongated particle

among all N particles. The largest eigenvalue of

is the primary order parameter S r , which quantifies the degree of alignment.…”

Section: Resultsmentioning

confidence: 99%

3D DEM Simulations and Experiments on Spherical Impactor Penetrating into the Elongated Particles

Hua

et al. 2023

Materials

Self Cite

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“…Comparing with Figure 11b, more particles point to the flow direction for β = 8 than that for β = 4. The reason may be that, as shown in Equations ( 1)-( 3) and ( 7)- (10), the forces and moments acting on particles are directly related to the particle aspect ratioβ, in As for the orientation distribution of particles, for the case of shear-thickening fluid in Figure 9b, more particles orient to the flow direction in the contraction flow (x < 0) because of high viscosity and even large force and torque acting on particles as shown in Equations ( 13) and ( 14), while viscosity and force are related to the velocity gradient as shown in Equation (15). By comparison, the orientation distribution of particles is more dispersed in the contraction flow for the shear-thinning fluid as shown in Figure 10b.…”

Section: Effect Of Particle Aspect Ratio On the Distribution Of Parti...mentioning

confidence: 99%

“…They also obtained the distributions of pressure, velocity and turbulent kinetics along the axis of the riser [9]. Hao et al [10] simulated numerically the frictional rod-like particle shear flows with different size distributions (monodisperse, binary, Gaussian, uniform), it was found that stress fluctuation reached the maximum, and stress rate increased with the increase of volume fraction at the jamming volume fraction. The jamming volume fraction presented obvious dependences on the fraction of longer particles and particle size in the case of polydisperse particles.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Distribution of Rodlike Particles in Laminar Flows of Power Law Fluids Past a Cylinder

Lin

Zhang

et al. 2023

Polymers

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The contraction/expansion laminar flow containing rodlike particles in power-law fluid is studied numerically when the particles are in a dilute phase. The fluid velocity vector and streamline of flow are given at the finite Reynolds number (Re) region. The effects of Re, power index n and particle aspect ratio β on the spatial and orientation distributions of particles are analyzed. The results showed that for the shear-thickening fluid, particles are dispersed in the whole area in the contraction flow, while more particles are gathered near the two walls in the expansion flow. The spatial distribution of particles with small β is more regular. Β has a significant, n has a moderate, but Re has a small impact on the spatial distribution of particles in the contraction and expansion flow. In the case of large Re, most particles are oriented in the flow direction. The particles near the wall show obvious orientation along the flow direction. In shear-thickening fluid, when the flow changes from contraction to expansion, the orientation distribution of particles becomes more dispersed; while in shear-thinning fluid, the opposite is true. More particles orient to the flow direction in expansion flow than that in contraction flow. The particles with a large β tend to align with the flow direction more obviously. Re, n and β have great influence on the orientation distribution of particles in the contraction and expansion flow. Whether the particles initially located at the inlet can bypass the cylinder depends on the transverse position and initial orientation of the particles at the inlet. The number of particles with θ0 = 90° bypassing the cylinder is the largest, followed by θ0 = 45° and θ0 = 0°. The conclusions obtained in this paper have reference value for practical engineering applications.

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“…Mezi et al 6 propose a numerical method for computing the flow of fiber suspensions with a large aspect ratio in planar and converging geometries. Hao et al 7 utilized the discrete element method to analyze the shear flow of cylindrical particles, aiming to elucidate the interaction mechanism of fibers at the microscopic level. The study investigates the influences of particle size distribution and interparticle friction coefficient on the solid phase stresses, bulk friction coefficient, and jamming transition, which are investigated.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Proppant Settling Velocity in Fiber-Containing Fracturing Fluids

Bai,

2023

ACS Omega

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Hydraulic fracturing is the main stimulation method in the development of oil and gas fields. It is helpful to predict the fracture support effect during fracturing by calculating the settling velocity of particles in the fracturing fluid. Experimental research shows that fibers mixed into the fracturing fluid can improve the performance of suspended sand. In this study, fiber was considered a solvent in the fracturing fluid, and the constitutive model of the fiber-containing fracturing fluid was modified according to the fluid rheology. From the analysis of the mechanical behavior in the fibercontaining fluid, the settling velocity of particles slowed down because of some reasons. First, the viscosity of the fiber-containing fracturing fluid increased significantly. The other mechanism is the resistance mechanism of the fiber acting on the particle. The apparent viscosity was fitted based on the rheological model and the measurements. Then, the drag coefficient model of the settling particles was built according to the rheological data of the fibrous fluid. A semi-empirical model was developed to predict the terminal settling velocity through research on dynamics. By characteristic analysis of the results, we found that the fiber on the settling velocity is closely related to the concentration of the base fluid. This prediction model is suitable for the base fluid and fiber-containing fracturing fluid, and the average relative difference between the prediction model and measurements was acceptable.

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Jamming in granular shear flows of frictional, polydisperse cylindrical particles

Cited by 12 publications

References 45 publications

3D DEM Simulations and Experiments on Spherical Impactor Penetrating into the Elongated Particles

3D DEM Simulations and Experiments on Spherical Impactor Penetrating into the Elongated Particles

Numerical Study on the Distribution of Rodlike Particles in Laminar Flows of Power Law Fluids Past a Cylinder

Prediction of Proppant Settling Velocity in Fiber-Containing Fracturing Fluids

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