Power-Law Scaling in Granular Rheology across Flow Geometries
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© 2020 American Physical Society. Based on discrete element method simulations, we propose a new form of the constitutive equation for granular flows independent of packing fraction. Rescaling the stress ratio μ by a power of dimensionless temperature Θ makes the data from a wide set of flow geometries collapse to a master curve depending only on the inertial number I. The basic power-law structure appears robust to varying particle properties (e.g., surface friction) in both 2D and 3D systems. We show how this rheology fits and extends frameworks such as kinetic theory and the nonlocal granular fluidity model.
Date issued
2020Department
Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Kim, Seongmin and Kamrin, Ken. 2020. "Power-Law Scaling in Granular Rheology across Flow Geometries." Physical Review Letters, 125 (8).
Version: Final published version