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Anomalous transport in conical granular piles
Peter Ahlgren1, Mikkel Avlund, Ib Klewe
1The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.
Summary
Experiments in 2+1 dimensions reveal new avalanche properties in granular materials. Particle transport shows scale invariance, with crossing times varying over orders of magnitude.
Area of Science:
- Physics
- Granular Materials Science
Background:
- Previous studies focused on 1+1 dimensional granular dynamics.
- Understanding the impact of dimensionality on granular flow is crucial.
Purpose of the Study:
- To investigate the effects of 2+1 dimensions on granular pile avalanche dynamics.
- To characterize the transport properties of elongated particles in higher dimensions.
Main Methods:
- Experimental setup involving 2+1-dimensional piles of elongated particles.
- Comparative analysis with existing 1+1 dimensional experimental data.
Main Results:
- The addition of a dimension significantly altered avalanche properties, introducing a characteristic avalanche size.
- Single grain transit times exhibited a wide range, spanning orders of magnitude (seconds to over 100 hours).
- A power-law distribution characterized the transit times, indicating scale invariance.
Conclusions:
- Higher dimensionality fundamentally changes granular avalanche behavior.
- Scale invariance governs particle transport in these 2+1 dimensional granular systems.