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Accretion Dynamics on Wet Granular Materials.

Guillaume Saingier1, Alban Sauret1, Pierre Jop1

  • 1Surface du Verre et Interfaces, UMR 125, CNRS/Saint-Gobain, 39, quai Lucien Lefranc, F-93303 Aubervilliers, Cedex France.

Physical Review Letters
|June 6, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals two distinct regimes governing how dry grains attach to wet granular materials. Understanding these mechanisms, driven by liquid fraction and capillary forces, is key for controlling aggregate formation in various industries.

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Area of Science:

  • Physics of granular materials
  • Soft matter physics
  • Fluid dynamics

Background:

  • Wet granular aggregates are crucial in manufacturing diverse products, including construction materials, food, and pharmaceuticals.
  • The physical processes underlying the mixing of dry grains with wet substrates remain poorly understood and challenging to control.

Purpose of the Study:

  • To experimentally investigate the accretion dynamics of dry grains onto a wet granular substrate.
  • To elucidate the physical mechanisms controlling the growth and cohesion of wet granular aggregates.

Main Methods:

  • Experimental measurement of wet aggregate growth dynamics.
  • Analysis of liquid fraction at the aggregate surface.
  • Investigation of capillary and hydrostatic depression effects.

Main Results:

  • Wet granular aggregates are fully saturated, with cohesion maintained by capillary depression at the air-liquid interface.
  • Aggregate growth exhibits two distinct regimes: viscous and capture.
  • The viscous regime is limited by capillary-driven liquid flow, while the capture regime depends on liquid availability controlled by hydrostatic depression.

Conclusions:

  • A model is proposed that explains the observed growth dynamics based on the evolution of capture probability with hydrostatic depression.
  • The findings provide a framework for understanding and controlling the formation of wet granular aggregates.
  • This research offers insights into the fundamental physics of granular material assembly.