The behavior of a swarm of particles moving in a viscous fluid

Adachi, Kohsuke; Kiriyama, S.; Yoshioka, Naoya

doi:10.1016/0009-2509(78)85077-5

Cited by 52 publications

(38 citation statements)

References 9 publications

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“…One more interesting similarity to previous study is about the settling velocity. Adachi [15] reported that the particle clouds settle as one body when the ratio of the settling velocity to that of an isolated particle is larger than 16. This can be interpreted as one aspect of the threshold for collective motion of clouds.…”

Section: Transition From Fluid-like To Particle-like Settlingmentioning

confidence: 99%

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Particle-like and fluid-like settling of a stratified suspension

2012

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Abstract. The gravitational settling of inhomogeneously suspended particles in fluid has been investigated. Of particular interest is whether collective or individual motion of particles is dominant during their settlings, i.e., whether the particles settle as a continuous suspension or they settle individually relative to surrounding fluid. We observed the settling of a stratified suspension which has the lower and upper concentration interfaces in quasi-two dimensional vessel. In some cases, the suspension behaves perfectly as a continuous fluid and the motion of the constituent particle is subject to bulk flow caused by the interfacial instability. In other cases, the particle behaves individually relative to surrounding fluid. The existence of concentration interface plays a significant role in these extreme behaviors of suspension. The transition from the collective to individual behaviors can be predicted quantitatively by a parameter which expresses the border resolution of concentration interface.

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Section: Transition From Fluid-like To Particle-like Settlingmentioning

confidence: 99%

“…The other example is falling clouds of particles in liquid. Some researchers have found the interesting motion of particle clouds such as torus formation, cloud breakup or leakage of particles [12][13][14][15]. These motions occur under the influence of the concentration interface which borders the particle clouds.…”

Section: Introductionmentioning

confidence: 99%

Particle-like and fluid-like settling of a stratified suspension

2012

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“…A number of authors (Adachi, Kiriyama and Yoshioka, 1978;Machu et al, 2001;Smith, 2000) have examined the dispersion of multiple particles injected into a liquid, dropped on to the surface of a liquid, or allowed to settle through a liquid under gravity. Experimental and theoretical work by Adachi, Kiriyama and Yoshioka (1978) considered the way in which a "swarm" or "plume" of microscopic particles behaved in a viscous fluid.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental and theoretical work by Adachi, Kiriyama and Yoshioka (1978) considered the way in which a "swarm" or "plume" of microscopic particles behaved in a viscous fluid. They found that under certain conditions, a swarm of such particles would act like a viscous drop.…”

Section: Introductionmentioning

confidence: 99%

“…a torus where liquid streamlines penetrate the torus at the centre) as opposed to a closed torus (where the streamlines envelope the torus without penetrating the torus at the centre). Although a theoretical sedimentation velocity for the particle swarm was developed by Adachi, Kiriyama and Yoshioka (1978), the transient shape evolution of the swarm was not modelled. Machu et al (2001) examined the motion and shape evolution of a dilute suspension of micronsized spherical glass beads injected into an initially quiescent liquid of the same composition as the carrier liquid in the injected suspension.…”

Section: Introductionmentioning

confidence: 99%

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An Eulerian-Eulerian Model for the Dispersion of a Suspension of Microscopic Particles Injected Into a Quiescent Liquid

Holbeach

Davidson

2009

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:The convective dispersion of a suspension of microscopic particles injected into an initially quiescent liquid is examined using a finite volume, Eulerian-Eulerian computational fluid dynamics model. The motion of the phases is coupled with particle-particle interactions represented using a solids pressure formulation. The solids are of greater density than the liquid and settle after injection, creating a liquid flow field that eventually results in a toroidal plume of solids descending through the liquid phase. Excellent qualitative agreement between predicted plume shapes and published experimental shapes are obtained for 50 μm particles. For particle diameters less than 50 μm, the solids plume exhibits a toroidal recirculation in the liquid and particle phases relative to the downward motion of the plume. However, for particle diameters greater than 375 μm, a toroidal liquid recirculation is not predicted within the solids plume. The initial shape of the plume immediately after injection is affected by all parameters: density ratio, liquid viscosity, particle diameter, and injection parameters. It is concluded that it is this initial shape that determines the subsequent plume shape at a particular depth of penetration for varying solids density and liquid viscosity.

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Particle Swarms in Fractures

Boomsma

Pyrak‐Nolte

2015

Dynamics of Fluids and Transport in Complex Fractured-Porous Systems

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The behavior of a swarm of particles moving in a viscous fluid

Cited by 52 publications

References 9 publications

Particle-like and fluid-like settling of a stratified suspension

Particle-like and fluid-like settling of a stratified suspension

An Eulerian-Eulerian Model for the Dispersion of a Suspension of Microscopic Particles Injected Into a Quiescent Liquid

Particle Swarms in Fractures

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