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Mixing and condensation in a wet granular medium
Dimitrios Geromichalos1, Mika M Kohonen, Frieder Mugele
1Applied Physics Laboratory, Ulm University, Ulm, D-89069, Germany. Dimitrios.Geromichalos@physik.uni-ulm.dr
Physical Review Letters
|May 7, 2003
Summary
Adding small amounts of liquid to granular systems affects bead segregation. A critical liquid content induces a transition to viscoplastic behavior, explained by liquid bridge forces and a phase diagram.
Area of Science:
- Granular physics
- Soft matter physics
- Rheology
Background:
- Granular materials exhibit complex behaviors influenced by inter-particle forces.
- The addition of liquids can significantly alter the macroscopic properties of granular systems.
Purpose of the Study:
- To investigate the impact of liquid content on the dynamic behavior and segregation in a binary granular mixture.
- To understand the transition to viscoplasticity in wet granular systems.
Main Methods:
- Experimentally studying a granular system composed of glass beads of two distinct sizes.
- Systematically varying the liquid content and observing its effect on bead segregation and flow behavior.
Main Results:
- Observed nontrivial dependence of large bead segregation on liquid content.
- Identified a critical liquid content for the transition to viscoplastic behavior, dependent on bead size.
- Interpreted the transition as a condensation phenomenon driven by hysteretic liquid bridge forces.
Conclusions:
- Liquid bridges play a crucial role in the macroscopic behavior of granular mixtures.
- The study provides a phase diagram illustrating the transition to viscoplasticity in wet granular systems.