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How size ratio and segregation affect the packing of binary granular mixtures
Salvatore Pillitteri1, Eric Opsomer1, Geoffroy Lumay1
1Quartier Agora, allée du six Août 19, Liège, Belgium. s.pillitteri@uliege.be.
Soft Matter
|September 11, 2020
Summary
Mixing granular materials of different sizes aims for high packing fractions, but segregation often lowers them. This study identifies key parameters and models segregation
Area of Science:
- Granular physics
- Materials science
- Statistical mechanics
Background:
- Mixing granular materials of different sizes is common for achieving high packing fractions.
- Granular segregation, where particles separate by size, often leads to reduced packing efficiency.
Purpose of the Study:
- To investigate the impact of granular segregation on packing fractions in binary granular systems.
- To identify the key parameters governing granular segregation and its effect on packing.
- To develop a predictive model for packing fraction that accounts for segregation.
Main Methods:
- Conducted extensive experiments using various binary granular systems.
- Analyzed the influence of small bead volume fraction (f) and grain size ratio (α).
- Developed and validated a new model incorporating granular segregation effects.
Main Results:
- Identified volume fraction (f) and grain size ratio (α) as critical parameters in granular segregation.
- Demonstrated a direct correlation between granular segregation and reduced global packing fraction.
- The proposed model shows good agreement with experimental and simulation data.
Conclusions:
- Granular segregation significantly impacts the achievable packing fraction in mixed granular systems.
- A novel model dependent on grain size ratio (α) accurately predicts packing fraction, considering segregation.
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