Rheological Regimes in Agitated Granular Media under Shear

D'Angelo O, Sperl M, Kranz WT (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Physical Review Letters American Physical Society

Book Volume: 134

Article Number: 148202

Journal Issue: 14

DOI: 10.1103/PhysRevLett.134.148202

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.

Involved external institutions

Université Fédérale de Toulouse Midi-Pyrénées FR France (FR) Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR) / German Aerospace Center DE Germany (DE)

How to cite

APA:

D'Angelo, O., Sperl, M., & Kranz, W.T. (2025). Rheological Regimes in Agitated Granular Media under Shear. Physical Review Letters, 134(14). https://doi.org/10.1103/PhysRevLett.134.148202

MLA:

D'Angelo, Olfa, Matthias Sperl, and W. Till Kranz. "Rheological Regimes in Agitated Granular Media under Shear." Physical Review Letters 134.14 (2025).

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