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Updated: May 1, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
Published on: April 10, 2017
Rheology of non-Brownian suspensions
Morton M Denn1, Jeffrey F Morris
1Benjamin Levich Institute and Department of Chemical Engineering, City College of New York, New York, New York 10031; email: denn@ccny.cuny.edu , morris@ccny.cuny.edu.
Concentrated suspensions of non-Brownian particles show complex nonlinear flow behavior, even in simple fluids. Particle interactions are key, and current models struggle to fully explain these rheological properties.
Area of Science:
- Rheology
- Fluid Dynamics
- Materials Science
Background:
- Non-Brownian particle suspensions are prevalent across many industries.
- These systems often display nonlinear flow characteristics, deviating from expected linear behavior.
Purpose of the Study:
- To review and analyze the rheological behavior of concentrated suspensions.
- To explore particle-level and continuum mechanics approaches for understanding nonlinear flow.
Main Methods:
- Literature review of rheological studies on concentrated suspensions.
- Examination of particle-level interactions and continuum theories.
Main Results:
- Nonlinear flow behavior is observed even in Newtonian fluids when inertial effects are negligible.
- Particle-particle nonhydrodynamic interactions are significant in concentrated suspensions.
Conclusions:
- Current continuum models are insufficient to fully capture the observed nonlinear rheological behavior.
- Further development of theoretical frameworks is needed to accurately describe these complex suspensions.
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