Transport Properties and Segregation Phenomena in Vibrating Granular Beds

Liao, Chun Chung; Hsiau, Shu San

doi:10.14356/kona.2016020

Cited by 14 publications

(2 citation statements)

References 103 publications

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“…7C). It is speculated here that these assemblages result from a process of vertical grain segregation caused by the ‘Brazil nut effect' (Clement et al ., 2010; Liao & Hsiau, 2016), also known as kinematic sieving, induced by vibrations in the wake of the hydraulic jump.…”

Section: Discussionmentioning

confidence: 99%

Sedimentary structure of inferred cyclic‐step bedforms in submarine volcaniclastic slope deposits, Cuatro Calas, south‐east Spain

Berg

Lang

2021

Sedimentology

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Cyclic steps are widespread on submarine slopes of many modern insular volcanoes. This paper provides the first detailed description and interpretation of the sedimentary structures and depositional architecture of cyclic-step deposits of such bedforms formed on the submarine slope of an ancient volcano. The partially depositional cyclic steps are preserved in a 67 m thick coset of 1 to 12 m thick cobble-based units of middle Miocene submarine volcaniclastics, exposed along a cliff outcrop in south-east Spain. The main structure in the units is unidirectional crude low-angle cross-bedding passing upward to centimetre to decimetre-scale diffuse stratification more or less parallel to the unit bounding surfaces. The depositional architecture produced by inferred sinuous to straight-crested cyclic steps is compared with deposits of crescentshaped cyclic steps formed in confined settings. With a novel method, a maximum cyclic step height and length of 22 m and 460 m, respectively, have been calculated. The architecture of some of the thicker cyclic-step units is complicated by structures that were formed as cyclic-step trough-fills, by superimposed cyclic steps or downstream migrating antidunes. These structures possibly reflect adaptation processes of the bedform morphology to a lower strength of the hydraulic jumps and related density flows. In the upper, less well-exposed part of the succession more steeply inclined gravel backsets that probably represent deposits of crescent-shaped cyclic steps accreted in a more energetic, confined setting proximal to the coastal source of the density flows. A facies model of straight-crested cyclic steps is presented that may aid in the identification of similar bedforms in submarine volcaniclastic environments and comparable non-volcanic settings.

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Section: Discussionmentioning

confidence: 99%

Sedimentary structure of inferred cyclic‐step bedforms in submarine volcaniclastic slope deposits, Cuatro Calas, south‐east Spain

Berg

Lang

2021

Sedimentology

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“…For larger grains ( 200 m), conditions for the initial destabilization of sand grains by the wind action are important to predict the transport of sandy matter in deserts [25]. Likewise, in granular matter manipulation stages, the mechanical collective vibration of grains, either horizontal or vertical, is also an important external perturbation giving rise to phenomena as segregation, convection cells, fluidization and many other interesting problems that have been extensively studied in the granular matter community [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Resuspension processes in a wide range of particle sizes

et al. 2021

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Particulate matter offers a broad spectrum of phenomena, well known in the granular matter community. This fact is not only related to the individual or collective behaviour that grains can present depending on the external boundary conditions and/or internal interactions but, to the wide range of particle sizes. This feature confers the possibility of studying a particular phenomenon in different size scales. The main goal of this paper is to describe the detachment of particles from surfaces, where particles go from tens of microns to several millimetres, in a variety of scenarios. All the studied systems presented here have in common the need to determine the critical conditions to lose the equilibrium balance, initiating incipient motion. Solving the right time moment for particle resuspension, consideration of the local interactions between particle, surface and external applied forces can be achieved from different modelling approaches, from deterministic dynamics to statistical mechanics. This paper focuses on some of these approaches performed recently on grains through different size scales.

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Facile preparation of tissue engineering scaffolds with pore size gradients using the muesli effect and their application to cell spheroid encapsulation

et al. 2020

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Porous biodegradable scaffolds have many applications in bioengineering, ranging from cell culture and transplantation, to support structures, to induce blood vessel and tissue formation in vivo. While numerous strategies have been developed for the manufacture of porous scaffolds, it remains challenging to control the spatial organization of the pores. In this study, we introduce the use of the granular convection effect, also known as the muesli or brazil nut effect, to rapidly engineer particulate templates with a vertical size gradient. These templates can then be used to prepare scaffolds with pore size gradients. To demonstrate this approach, we prepared templates with particle size gradients, which were then infused with a prepolymer solution consisting of the pentaerythritol ethoxylate (polyol), sebacoyl chloride (acid chloride), and poly(caprolactone). Following curing, the template was dissolved to yield biodegradable polyester‐ether scaffolds with pore size gradients that could be tuned depending on the size range of the particulates used. The application of these scaffolds was demonstrated using pancreatic islets, which were loaded via centrifugation and retained within the scaffold's pores without a decrease in viability. The proposed strategy provides a facile approach to prepare templates with spatially organized pores that could potentially be used for cell transplantation, or guided tissue formation.

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Transport Properties and Segregation Phenomena in Vibrating Granular Beds

Cited by 14 publications

References 103 publications

Sedimentary structure of inferred cyclic‐step bedforms in submarine volcaniclastic slope deposits, Cuatro Calas, south‐east Spain

Sedimentary structure of inferred cyclic‐step bedforms in submarine volcaniclastic slope deposits, Cuatro Calas, south‐east Spain

Resuspension processes in a wide range of particle sizes

Facile preparation of tissue engineering scaffolds with pore size gradients using the muesli effect and their application to cell spheroid encapsulation

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