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Geometry-controlled phase transition in vibrated granular media
René Zuñiga1,2, Germán Varas2, Stéphane Job3
1Laboratoire Quartz, EA-7393, ISAE-Supméca, 3 rue Fernand Hainaut, 93400, Saint-Ouen-sur-Seine, France.
Scientific Reports
|September 2, 2022
Summary
Modifying container geometry, like a V-shape, enhances particle disorder and agitation in vibrated granular media. This method maximizes energy use for blending and vibration absorption, outperforming simple vibration tuning.
Area of Science:
- Physics
- Materials Science
- Complex Systems
Background:
- Granular media serve as analogs for thermodynamic systems.
- Energy injection via vibration can induce fluidization in granular materials.
- Container geometry's role in granular dynamics is less explored than vibration parameters.
Purpose of the Study:
- Investigate how container geometry influences vibrated granular media dynamics.
- Maximize internal disorder and agitation for applications like particle blending and vibration absorption.
- Explore the interplay between external vibration and container asymmetry.
Main Methods:
- Experiments on vibrated particles in a 2D vertical container.
- Modification of container base into a V-shape to break symmetry.
- Analysis of solid-to-fluid volume fraction and granular temperature.
- Comparison with KTHNY theory for 2D melting.
Main Results:
- V-shape container geometry induces coexistence of crystalline and amorphous phases.
- Solid-to-fluid volume fraction and granular temperature depend on vibration and topological defects.
- Asymmetry-induced defects significantly impact granular dynamics.
- Observed phenomena align with two-dimensional melting transition theories.
Conclusions:
- Container geometry is a crucial factor in controlling granular media behavior.
- V-shape geometry effectively enhances disorder and agitation by introducing topological defects.
- This approach offers a novel way to optimize granular systems for specific applications.
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