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Updated: May 11, 2026
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Capillarylike fluctuations of a solid-liquid interface in a noncohesive granular system.
Li-Hua Luu1, Gustavo Castillo, Nicolás Mujica
1Departamento de Física, Facultad de Ciencias Físicas y Matemáticas Universidad de Chile, Avenida Blanco Encalada 2008, Santiago, Chile. luulihua@yahoo.fr
Summary
Vertically vibrated granular matter exhibits a solid-liquid-like transition due to particle collisions. The study characterizes interface fluctuations using capillary wave theory, revealing surface tension and mobility.
Area of Science:
- Physics
- Soft Matter Physics
- Granular Dynamics
Background:
- Noncohesive granular matter displays collective motion, notably clustering.
- Vertical vibration of granular monolayers induces a solid-liquid-like transition above a critical driving amplitude.
Purpose of the Study:
- Investigate the physical mechanism of particle clustering in vibrated granular systems.
- Characterize the fluctuations at the solid-liquid interface.
- Determine interface properties like surface tension and mobility.
Main Methods:
- Experimental investigation of quasi-two-dimensional granular monolayers.
- Analysis of coarse-grained solid-liquid interface fluctuations.
- Utilizing static and dynamic correlation functions in Fourier space.
- Application of capillary wave theory.
Main Results:
- Particle clustering is driven by grain collisions, not cohesive forces.
- Interface fluctuations are well-described by capillary wave theory.
- Surface tension and mobility were measured, consistent with theoretical estimations.
- Energy equipartition observed at the solid-liquid interface despite non-uniform granular temperature.
Conclusions:
- The solid-liquid transition in vibrated granular matter is governed by collision-mediated interactions.
- Capillary wave theory effectively models the interface dynamics, enabling property extraction.
- Granular systems exhibit behaviors analogous to atomic systems regarding interface properties.
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