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Structural characterization of submerged granular packings.

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Summary

Increasing effective gravity in granular materials with fluids leads to more ordered particle structures. This study reveals how gravity influences microstructural properties and pore distribution in dense granular systems.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Granular materials exhibit complex microstructures influenced by external forces.
  • Understanding particle organization is crucial for predicting bulk material behavior.
  • Fluid-grain interactions significantly alter packing properties.

Purpose of the Study:

  • To investigate the effect of effective gravitational acceleration on the microstructural properties of granular packings.
  • To analyze how fluid density impacts these gravitational effects.
  • To provide data for validating simulation techniques for immersed granular particles.

Main Methods:

  • Experimental studies using spherical granular materials saturated in fluids of varying densities.
  • Characterization of local sphere organization using contact connectivity, Delaunay free volumes, and Voronoi polygon shape factors.
  • Analysis of pore distribution curves and local area distributions (Voronoi cells).

Main Results:

  • Increased effective gravity narrows the shape factor distribution, favoring more ordered, hexagonal-like arrangements.
  • Pore distribution asymmetry decreases with stronger effective gravity, especially for lower fluid densities.
  • Decreased effective gravity broadens local area distributions, leading to larger pores and chain-like structures.

Conclusions:

  • Effective gravity is a key parameter controlling microstructural ordering in fluid-saturated granular packings.
  • The interplay between gravity and fluid density dictates the formation of ordered or disordered structures.
  • Experimental findings offer valuable benchmarks for computational models of immersed granular systems.