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Rheology of bidisperse non-Brownian suspensions
Abhinendra Singh1,2,3, Christopher Ness4, Abhishek K Sharma3
1Department of Macromolecular Science and Engineering, <a href="https://ror.org/051fd9666">Case Western Reserve University</a>, Cleveland, Ohio 10040, USA.
Physical Review. E
|October 19, 2024
Summary
This study reveals how particle size and concentration affect the flow behavior of suspensions. Adding smaller particles to larger ones can surprisingly reduce overall viscosity, a key finding for material science applications.
Area of Science:
- Rheology
- Soft Matter Physics
- Computational Materials Science
Background:
- Non-Brownian suspensions exhibit complex flow behaviors.
- Understanding particle interactions is crucial for predicting macroscopic properties.
Purpose of the Study:
- To investigate the rheology of bidisperse non-Brownian suspensions.
- To map viscosity as a function of particle size ratio, abundance, and solid content.
Main Methods:
- Particle-based simulation was employed.
- Viscosity was analyzed as a function of applied stress and composition.
Main Results:
- Shear-thickening behavior was observed across all compositions.
- The limiting solids fraction showed non-monotonic dependence on the mixing ratio.
- Contact force analysis revealed an asymmetric stress contribution shift between large-large and small-small particle contacts.
Conclusions:
- A comprehensive rheological model was developed by integrating shear thickening and jamming models.
- The model successfully predicts viscosity reduction upon adding small particles to suspensions of large particles.
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