Rheological Regimes in Agitated Granular Media under Shear
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.
Authors
- Matthias Sperl (ORCID: https://orcid.org/0000-0001-9525-0368)
- Olfa D’Angelo (ORCID: https://orcid.org/0000-0002-7218-4596)
- W. Till Kranz (ORCID: https://orcid.org/0000-0003-0061-8524)
Institutions
- Université Fédérale de Toulouse Midi-Pyrénées (FR)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Institut Superieur de l'Aeronautique et de l'Espace (ISAE-SUPAERO) (FR)
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE)
- Instituto de Física Teórica (ES)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-04-07
- DOI
- https://doi.org/10.1103/physrevlett.134.148202
- Citations
- 6
- Primary Topic
- Granular flow and fluidized beds
- Type
- article
- Field-Weighted Citation Impact
- 8.01
Funders
- European Space Agency
- Deutscher Akademischer Austauschdienst
- Deutsche Forschungsgemeinschaft
- Centre National d’Etudes Spatiales
- Deutsches Zentrum für Luft- und Raumfahrt
- Centre National de la Recherche Scientifique