Year: 2025
Type: article
Abstract: Agitated granular media have a rich rheology: they exhibit Newtonian behavior at low shear rate and density, develop a yield stress at high density, and cross over to Bagnoldian shear thickening when sheared rapidly-making it challenging to encompass them in one theoretical framework. We measure the rheology of air-fluidized glass particles, spanning 5 orders of magnitude in shear rate. By comparing fluidization-induced to Brownian agitation, we show that all rheological regimes can be delineated by two dimensionless numbers-the Péclet number, Pe, and the ratio of shear-to-fluidization power, Π-and propose a constitutive relation that captures all flow behaviors, qualitatively and quantitatively, in one unified framework.
Source: Physical Review Letters
Authors: Olfa D’Angelo, Matthias Sperl, W. Till Kranz
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
OpenAlex ID: W4409218976