Granular Species Segregation under Vertical Tapping: Effects of Size, Density, Friction, and Shaking Amplitude

Ciamarra, Massimo Pica; Vizia, Maria Domenica De; Fierro, Annalisa; Tarzia, Marco; Coniglio, Antonio; Nicodemi, Mario

doi:10.1103/physrevlett.96.058001

Cited by 73 publications

(36 citation statements)

References 33 publications

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“…The "RBN" separation ("A rising" when r B /r A <1 or "B rising" when r B /r A >1 in FIGUER 3) is favored when the coefficient of restitution e or the amplitude A is large. Our computed results qualitatively agree with Massimo's [12].…”

Section: Phase Diagramsupporting

confidence: 82%

Size separation of binary mixture under vibration

Liu¹,

Tong²,

Yin³

et al. 2013

AIP Conference Proceedings

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Abstract. By considering as a thermodynamic system, a minimum energy principle is established, in which the granular system changes its size distribution to make itself to be at the lowest energy state as soon as possible on the precondition that it dissipates all of the energy supplied from the vibrating bottom. A model is presented based on this principle to clarify why and how binary mixture separates under vibration. The small particles tend to sink in order to lower the kinetic energy of system, while the heavy particles sink in order to lower the potential energy. The mixture separates finally based on the competition between the two effects. The results of our model qualitatively agree with the previous researches.

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Section: Phase Diagramsupporting

confidence: 82%

Size separation of binary mixture under vibration

Liu¹,

Tong²,

Yin³

et al. 2013

AIP Conference Proceedings

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“…Each photo was used for finding vertical positions of the centroid of each particle by using open-source software named "ImageJ" [9]. Specifying the vector y i as the height of particle i with respect to the container base and the total number of particles of species inside the container is N Į , the average height of particle can be thus determined by These vertical positions were then employed to statistically compute the degree of segregation of the binary mixture in a static state, which is quantified by the vertical segregation coefficient [10,11]:…”

Section: Fig 1 Schematic Drawing Of An Experimental Setupmentioning

confidence: 99%

Experimental study of particle size segregation in 2D granular materials under vertical vibrations

2017

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Abstract. The influence of particle size on segregation phenomena in two-dimensional binary granular mixtures with a similar solid fraction under vertical vibrations is experimentally investigated in this study. Four different particle size ratios (D l /D s ) are varied. The granular mixtures are subjected to vertical vibrations under six different dimensionless accelerations (ī = 1-6), with constant vibrational amplitude of 5 mm. The vertical segregation coefficient (H) is here introduced to analyse the degree of segregation of the mixtures. We found that the Brazil nut effect, where the larger particle rises to the top, is observed for all the tests whenever the segregation is occurred. The degree of segregation of the mixtures is a function of the coefficient H, which can be divided into 3 zones: a compaction zone with particle mixing (0.0 < H 0.2), a partially segregated zone (0.2 < H 0.4), and an apparently segregated zone (0.4 < H 1.0). The segregation begins when ī 2 and then tends to increase when ī is increased. In addition, the segregation is quite clearly found when D l /D s 3 and ī 3.

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“…It can be caused by size, shape and other material properties. In the past decades, many studies have been carried out in this area [1][2][3][4]. Accordingly, various segregation mechanisms have been identified, including voidfilling [1], convection [2] and arching [3].…”

Section: Introductionmentioning

confidence: 99%