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

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Segregation induced by inelasticity in a vibrofluidized granular mixture.

R Brito¹, H Enríquez, S Godoy

¹Departamento de Física, FCFM, Universidad de Chile, Casilla, Santiago, Chile.

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

|July 23, 2008

Summary

Granular particle mixtures segregate when vibrated, with more dissipative particles sinking below less dissipative ones. This microsegregation is driven by buoyancy, creating dense, cold regions around inelastic particles.

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Area of Science:

Physics
Granular Mechanics
Statistical Mechanics

Background:

Granular mixtures exhibit complex behaviors under external stimuli.
Understanding segregation mechanisms is crucial for controlling granular flows.

Purpose of the Study:

To investigate the segregation dynamics of a binary granular mixture with differing restitution coefficients.
To explore the microscopic origins of segregation in vibrated granular systems.

Main Methods:

Simulating a dense binary mixture of granular particles with varying restitution coefficients.
Applying vertical vibrations to the mixture under gravity.
Analyzing particle distribution and thermodynamic properties at the microscopic scale.

Main Results:

Partial segregation observed, with more dissipative particles submerging.
Segregation occurs even with elastic particles present.
Microscopic analysis revealed enhanced density and temperature pair distribution functions.
Increased probability of inelastic particles forming pairs (microsegregation).
Buoyancy-driven segregation with dense, cold regions around inelastic particles.

Conclusions:

Vertical vibration induces partial segregation in granular mixtures based on particle dissipation.
Microscopic buoyancy forces drive the segregation process.
The findings provide insights into the fundamental mechanisms governing granular mixture behavior.