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

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Transitions between multiple attractors in a granular experiment.

Frank Rietz¹, Ralf Stannarius

¹Otto-von-Guericke-University, D-39106 Magdeburg, Germany.

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

|June 12, 2012

Summary

This granular experiment reveals complex, drifting patterns in a rotating mixture of grains. The system exhibits stable oscillations, challenging current theoretical models.

Area of Science:

Physics
Granular Materials Science

Background:

Granular materials exhibit complex behaviors when subjected to external forces.
Previous studies have explored granular dynamics in cylindrical geometries.

Purpose of the Study:

To investigate quasiperiodic pattern formation in a rotating, bidisperse granular mixture within a flat container.
To analyze the spatiotemporal dynamics and long-term behavior of segregated granular patterns.

Main Methods:

Conducting a granular experiment using a rotating flat container.
Employing a bidisperse mixture of grains to observe pattern formation.
Long-term observation of system dynamics and state switching.

Main Results:

Generation of multiple quasiperiodic pattern solutions.

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Observation of spatiotemporally periodic drift in segregated patterns.

System exhibits stable oscillatory states and does not reach a stationary state.

Conclusions:

The study extends previous findings on granular dynamics in different geometries.
Observed phenomena present significant challenges for current theoretical and modeling approaches.
Quasiperiodic patterns and dynamic state switching are key characteristics of this granular system.