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

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Granular segregation in a thin drum rotating with periodic modulation.

Richard D P East¹, Philippa McGuinness¹, Finn Box¹

¹Manchester Center for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.

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

|December 11, 2014

Summary

This summary is machine-generated.

Modulating the rotation rate of granular materials in a drum alters segregation patterns by splitting or merging streaks. The modulation frequency and rotation rate dictate the number of streaks formed, consistent across various conditions.

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Area of Science:

Physics
Fluid Mechanics
Materials Science

Background:

Granular materials exhibit complex segregation patterns under rotation.
Steady rotation rates lead to predictable streak formation in thin drums.

Purpose of the Study:

To investigate the impact of sinusoidal rotation rate modulation on granular segregation patterns.
To determine how modulation frequency and rotation rate influence streak formation and stability.

Main Methods:

Experimental setup involving a thin drum filled with granular material.
Application of sinusoidal modulation to the drum's rotation rate.
Observation and analysis of resulting segregation patterns (streaks).

Main Results:

Sinusoidal modulation transforms base segregation patterns by splitting or merging streaks.
The number of streaks is determined by the ratio of modulation frequency to rotation rate.
Observed relationships hold for filling fractions deviating from 50% and are generalized by deposit geometry.

Conclusions:

Sinusoidal modulation offers a dynamic control mechanism for granular segregation.
The findings extend previous work by Fiedor and Ottino across a broader parameter space.
Results provide a generalized understanding of segregation dynamics influenced by rotation modulation and geometry.