Convective Flow in a Horizontally Vibrated 3D Granular Packing

Raihane, Ahmed; Bonnefoy, Olivier; Nadler, Sébastien; Gelet, Jean‐Louis; Chaix, Jean‐Marc; Thomas, Gérard

doi:10.1063/1.3180029

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The difference between relaxed and dynamic densities is associated to the relaxation of the fluidized region when vibration stops. If we associate the present results with the evaluation of the width of the fluidized zones measured from velocity fields [13,22,24], the schematic presentation of Fig. 1 is confirmed and can be quantitatively drawn in the case of 60 mm high initial packings (Fig.…”

Section: Discussionsupporting

confidence: 63%

Analysis of the densification of a vibrated sand packing

Raihane¹,

Bonnefoy²,

Chaix³

et al. 2011

Powder Technology

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International audienceTwo techniques have been used to analyze the densification of silica sand by horizontal sinusoidal vibrations of frequency f = 50 Hz for relative accelerations between 0 and 6: the quantitative analysis of motion observed through the transparent wall, and the altitude map of the free top surface of the sample. The first technique was used to analyze the transient regime: during the first 10 s, slight densification occurs at the bottom of the powder bed, while the upper part enters convective motion and the intermediate part reaches densities higher than 66%. The second technique allowed to quantify the evolution of the overall density vs. acceleration Γ during the steady regime (dynamic density) and after the vibrations (relaxed density): a maximum density is observed in both cases for an optimal acceleration which depends on the initial height of the powder bed. These results are analyzed and discussed

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Section: Discussionsupporting

confidence: 63%

Analysis of the densification of a vibrated sand packing

Raihane¹,

Bonnefoy²,

Chaix³

et al. 2011

Powder Technology

Self Cite

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“…This hysteresis can be explained by the fact that for the onset of flow static friction between the grains must be overcome, whereas once flowing the grains remain in motion, that is, they interact via dynamical friction [1] such that the more dilute case is easier to sustain [2]. The convective flow in deep horizontally shaken systems reveals a complex structure [1,4] and was the subject of intensive research [5][6][7][8][9][10][11]. The transition between solid and fluid states was also seen in (quasi) two-dimensional (2D) experiments [12] and simulations [4,[12][13][14] but no hysteresis was found.…”

Section: Introductionmentioning

confidence: 99%

Fluidization of a horizontally driven granular monolayer

et al. 2015

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We consider the transition of a horizontally vibrated monodisperse granular monolayer between its condensed state and its three-dimensional gaseous state as a function of the vibration parameters, amplitude, and frequency as well as particle number density. The transition is characterized by an abrupt change of the dynamical state which leaves its fingerprints in several measurable quantities including dissipation rate, sound emission, and a gap size which characterizes the sloshing motion of the material. The transition and its pronounced hysteresis is explained through the energy due to the collective motion of the particles relative to the container.

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“…The two layers are created by the presence of a free surface parallel to vibration direction and the gravity perpendicular to that direction [24]. That is, the upper layer near the free surface undergoes convection while the lower layer is forced to move along the vibration direction of container [25]. The macro characteristics of the particle flow and its processing effect on the workpiece mainly depend on the velocity fluctuation of the particles.…”

Section: Analysis Of Particle Velocity Distribution In One Horizontal...mentioning

confidence: 99%

Simulation and experimental study on the bidirectional composite vibratory finishing characteristics

Yang,

Li,

Wang

et al. 2023

Preprint

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As a novel high efficiency collaborative surface finishing technology of structure shape and surface integrity, bidirectional composite vibratory finishing (BCVF) can be applied to finish various complex components. The movement behavior of abrasive particles is closely related to the machined part performance. The flow characteristics of particles were analyzed based on the discrete element method (DEM), which reveals that the granular temperature can explain the changes in the normal and tangential cumulative contact energy on the workpiece surface. In addition, the normal contact force on the container sidewall and the pressure distribution on the workpiece surface were tested under different process parameters and the results were compared with DEM simulations. The results show that DEM model accurately predicted the particle-wall normal contact force frequency content, and the dominant frequencies are the container driving frequency and its multiplication. Meanwhile, the pressure-sensitive film can clearly and intuitively demonstrate the integrated action behavior of the particles on the workpiece surface. The overall trends of the measured pressure were comparable to the simulation results, in that the pressure increased significantly with vibration frequency and amplitude. Dimensionless vibration velocity amplitude has been verified effective in analyzing the combined effect of vibration frequency and amplitude. Therefore, it is shown that spherical particle in simulation can predict some critical properties in non-spherical processing, which provides a reference for the extended application of the BCVF process.

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Convective Flow in a Horizontally Vibrated 3D Granular Packing

Cited by 4 publications

References 3 publications

Analysis of the densification of a vibrated sand packing

Analysis of the densification of a vibrated sand packing

Fluidization of a horizontally driven granular monolayer

Simulation and experimental study on the bidirectional composite vibratory finishing characteristics

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