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Fluid-driven granular drainage in submerged silos shows subdiffusive behavior, deviating from dry silo models. Increased viscosity amplifies this anomalous diffusion, changing flow patterns.

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Area of Science:

  • Granular physics
  • Fluid dynamics
  • Non-Newtonian flow

Background:

  • Silo discharge is well-studied, but velocity fields in submerged systems remain unclear.
  • Existing diffusion models for granular flow show limitations in fluid-driven scenarios.

Purpose of the Study:

  • Investigate fluid-driven granular drainage in a quasi-2D submerged silo.
  • Characterize the velocity field and diffusion behavior.
  • Develop a model for anomalous diffusion in such systems.

Main Methods:

  • Conducted fluid-driven granular drainage experiments in a quasi-two-dimensional silo.
  • Submerged granular materials in fluid.
  • Analyzed velocity profiles and diffusion length variations with height and viscosity.

Main Results:

  • Observed Gaussian velocity profiles, consistent with diffusion models.
  • Diffusion length decreased with height, unlike in dry silos.
  • Increased viscosity led to increased diffusion length and altered flow zone shape, indicating subdiffusive behavior.

Conclusions:

  • Fluid-driven granular drainage exhibits anomalous subdiffusive behavior.
  • A phenomenological anomalous diffusion model is proposed.
  • Viscosity significantly impacts diffusion characteristics and flow patterns in submerged granular systems.