Microscopic origin of granular fluidity: An experimental investigation

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Granular fluidity is essential for nonlocal constitutive equations used in granular flow analysis.
• Experimental validation of these equations is limited due to laboratory challenges.
• The microscopic origins of granular fluidity remain unproven.

Purpose of the Study:

• To experimentally validate a microscopic definition of granular fluidity.
• To investigate the influence of basal boundary conditions on granular flow theories.

Main Methods:

• Experimental setup designed to observe single-particle interactions.
• Measurement of granular flow dynamics under controlled conditions.
• Analysis of data to correlate microscopic behavior with macroscopic fluidity.

Main Results:

• Provided experimental evidence supporting the microscopic definition of granular fluidity.
• Demonstrated the significant impact of basal boundary conditions on the validity of nonlocal theories.
• Quantified the relationship between particle-level mechanics and bulk flow properties.

Conclusions:

• The microscopic definition of granular fluidity is experimentally validated.
• Basal boundary conditions are critical for accurate modeling of granular flows.
• This work bridges the gap between microscopic particle behavior and macroscopic constitutive equations.