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Delayed transitions between fluid-like and solid-like granular states.

¹Dept. of Biomedical Engineering, Rutgers University, Piscataway, NJ 08854, USA. shinbrot@soemail.rutgers.edu

The European Physical Journal. E, Soft Matter

|February 24, 2007

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Granular flows, exhibiting both solid and fluid behaviors, can form deposits resembling water-carved landforms. This occurs under prolonged fluidization, such as in low gravity or during strong seismic events.

Area of Science:

Geophysics
Sedimentology
Physics of granular materials

Background:

Granular flows present a significant theoretical challenge due to their dual solid-like and fluid-like behaviors.
Analyzing these complex behaviors is crucial for understanding various natural phenomena and industrial processes.

Purpose of the Study:

To investigate unique depositional patterns arising from the coexistence of solid-like and fluid-like states in granular flows.
To identify signatures of underlying granular dynamics in specific experimental conditions.

Main Methods:

Examination of two experiments featuring marked coexistence of solid-like and fluid-like granular states.
Analysis of residual depositional patterns formed under prolonged grain fluidization.

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Main Results:

Prolonged fluidization of grains, observed in reduced gravity or under strong kinetic forcing (e.g., earthquakes), leads to unique depositional patterns.
These residual patterns are often indistinguishable from fluvial deposits, despite the absence of water.

Conclusions:

Granular materials can exhibit fluid-like behavior under specific conditions, such as prolonged fluidization.
Geological landforms on dry, low-gravity planets (like Mars) or those influenced by strong seismic activity may form through processes mimicking fluid dynamics.