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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

Partition instability in water-immersed granular systems.

C P Clement¹, H A Pacheco-Martinez, Michael R Swift

¹School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 8, 2009

Summary

Vertical vibration causes immersed grains to spontaneously segregate into one column. This fluid-driven partition instability is explained by a new analytical model based on coupled granular beds.

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Area of Science:

Physics
Granular Materials Science
Fluid Dynamics

Background:

Granular systems vibrated vertically can spontaneously segregate into a single column due to inelastic collisions.
This phenomenon has been observed in various granular materials.

Purpose of the Study:

To investigate the behavior of water-immersed barium titanate particles in a divided cell under vibration.
To develop numerical simulations and an analytical model to explain the observed fluid-driven partition instability.

Main Methods:

Experimental setup with a rectangular cell divided into two columns, linked by top and bottom holes.
Vertical vibration applied to the system of spherical barium titanate particles.
Development of numerical simulations to reproduce particle behavior and instability.
Formulation of a simple analytical model based on coupled granular beds in an incompressible fluid.

Main Results:

Observed spontaneous movement of grains into a single column via gradual transfer through the bottom connecting hole.
Numerical simulations successfully reproduced the observed segregation behavior.
Detailed insights into the instability mechanism were provided by the simulations.

Conclusions:

The study elucidates the mechanism of fluid-driven partition instability in vibrated granular systems.
A novel analytical model offers a simplified explanation for this complex phenomenon.
Findings contribute to understanding granular material dynamics in fluid environments.