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Ex Vivo Culture of Pharyngeal Arches to Study Heart and Muscle Progenitors and Their Niche
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Segregation in arch formation.

C F M Magalhães1, J G Moreira, A P F Atman

  • 1Departamento de Física, Universidade Federal de Minas Gerais, Caixa Postal 702, 30161-970, Belo Horizonte, MG, Brazil. caiofrancam@gmail.com

The European Physical Journal. E, Soft Matter
|May 25, 2012
PubMed
Summary
This summary is machine-generated.

Granular pile discharges reveal new segregation phenomena in clogging arches. Grain size and density influence arch composition, with mechanisms changing based on orifice width.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Granular materials exhibit complex flow behaviors.
  • Arch formation is a key phenomenon in granular discharge.
  • Segregation in granular mixtures is not fully understood.

Purpose of the Study:

  • To investigate segregation phenomena in clogging arches of granular piles.
  • To analyze the influence of grain size and density on arch formation.
  • To elucidate the underlying mechanisms of segregation during granular discharge.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Bidisperse mixtures of grains with varying size and density ratios were simulated.
  • Clogging arch composition and avalanche size distributions were analyzed.

Main Results:

  • Size bidisperse piles showed preferential inclusion of large grains in arches.
  • Density bidisperse mixtures exhibited a predominance of light grains in large orifices, with an inversion in small orifices.
  • A crossover between two segregation mechanisms was observed based on orifice width.

Conclusions:

  • Segregation phenomena in granular clogging arches are dependent on both grain size and density.
  • Reverse buoyancy and avalanche statistics explain the observed segregation crossover.
  • Understanding these mechanisms is crucial for controlling granular flow and preventing blockages.