Densification of a 3D Granular Bed by Horizontal Vibrations

Raihane, Ahmed; Bonnefoy, Olivier; Gelet, Jean‐Louis; Chaix, Jean‐Marc; Thomas, Gérard; Co, Albert; Leal, Gary L.; Colby, Ralph H.; Giacomin, A. Jeffrey

doi:10.1063/1.2964898

Cited by 4 publications

(11 citation statements)

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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%

“…The first application of the technique consists in evaluating the velocity fields, when stationary convection rolls are established: the analysis of velocity maps on images of the North face enables for instance to evaluate the limit between convective and glassy regions (Fig. 2), and therefore the height of the convective region at any acceleration Γ [22,25].…”

Section: Velocity Measurements On the North Face Of The Vibrating Boxmentioning

confidence: 99%

“…Various phenomena are observed and studied such as convective flow [4,12,13], transition from a solid-like state to a fluid-like state [11,[13][14][15], size separation [16] and surface patterns [17][18][19]. Few studies investigated the bulk density evolution with the vibration parameters [20][21][22].…”

Section: Introductionmentioning

confidence: 97%

“…The qualitative behaviour of the bed with respect to acceleration Γ as deduced in particular from our previous studies [13,22] is summarized in Fig. 1: above the onset of densification, three regions of the bed are observed: an upper one, showing convection rolls, a bottom region considered as jammed, showing almost no densification, and an intermediate "glassy" one, in which densification is expected to be enhanced.…”

Section: Introductionmentioning

confidence: 98%

“…Fluidization is associated to an expansion of the granular medium in the fluidized region. In previous works [13,22], we also considered the onset of densification which occurs at an acceleration Γ 0 below Γ 1 . -the convective motions in the sample above this critical value, giving rise to one, two or more convective rolls on the top part of the powder bed.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

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%

Section: Velocity Measurements On the North Face Of The Vibrating Boxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Analysis of the densification of a vibrated sand packing

Raihane¹,

Bonnefoy²,

Chaix³

et al. 2011

Powder Technology

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Behavioural responses to horizontal vibrations of quasi-2D ideal granular beds: an experimental approach

Moss¹,

Glovnea²

2023

Granular Matter

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In this experimental study, granular bed response to horizontal vibrations of various frequencies and amplitudes are examined with high-speed imaging. Ideal granular beds consisting of spherical glass beads are horizontally vibrated in a quasi-two-dimensional arrangement, firstly with homogeneous granular media and then with a ternary mixture to explore how bed response deviates with changes to material composition. Phenomena of note are the tendency for the homogeneous material to subdivide into discrete areas of crystalline lattice structures, bounded by non-crystalline lines of bead contacts, labelled in this paper as ‘shear lines’. Shear line failure arises as neighbouring crystalline areas slide relative to one another along their shared non-crystalline border, combining to form one larger crystalline area. Under vibration conditions where particle agitation and relative movement is high, sloshing occurs in the upper bed and triangular granular-gas regions form in the top corners. The ternary mixture also exhibits sloshing at low frequency and large amplitude, but the inhomogeneity of its composition prevents formation of ordered crystalline regions and shear lines, instead promoting low percolation and a jamming effect underneath the sloshing region. Surprisingly strong convective responses are induced in the inhomogeneous bed with more energetic vibrations. From the analysis of shear lines in the homogeneous beds, and of convection in the inhomogeneous beds, comparisons between homogeneous and inhomogeneous bed behaviour are drawn. Results are used to discuss how behavioural response of non-cohesive granular material to horizontal vibrations is ultimately tied to, and changes with, the geometric complexity of the internal packing structure. The concept of ‘geometric compatibility’ between constituent particle species in an inhomogeneous granular medium is proposed as an explanation for the low percolation and strong convective response to vibration. Graphical abstract

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Numerical Simulation Of Granular Media Under Horizontal Vibrations

Nadler¹,

Bonnefoy²,

Raihane³

et al. 2009

AIP Conference Proceedings

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Sinusoidal horizontal vibrations have been applied to a parallelepiped containing rounded sand grains. To model the granular medium behavior, a commercial software based on Molecular Dynamics has been used. The influence on the rheologic behavior of many process parameters, such as the dimensionless acceleration and the frequency has been studied. The velocity, density, pressure and mass flow fields have been computed, both in dynamic and static modes and compared with experimental results. The correlation between these different parameters has been also examined.

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Densification of a 3D Granular Bed by Horizontal Vibrations

Cited by 4 publications

References 0 publications

Analysis of the densification of a vibrated sand packing

Analysis of the densification of a vibrated sand packing

Behavioural responses to horizontal vibrations of quasi-2D ideal granular beds: an experimental approach

Numerical Simulation Of Granular Media Under Horizontal Vibrations

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