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DY: Fachverband Dynamik und Statistische Physik
DY 48: Granular Matter and Contact Dynamics
DY 48.3: Talk
Thursday, March 21, 2024, 15:30–15:45, BH-N 128
Rheological properties of fluidized granular matter — •Marlo Kunzner1, Olfa D'Angelo2, Till Kranz3, and Matthias Sperl1,3 — 1Institut für Materialphysik im Weltraum, DLR Köln, Deutschland — 2Institute of Multiscale Simulation, FAU Erlange, Deutschland — 3Institut für Theoretische Physik, Uni Köln, Deutschland
Aerated granular media are important in several industrial processes; yet, their flow-behavior is poorly understood. On one hand, the well-known Geldart classification [1] divides granulates by their fluidization characteristics; on the other hand, the rheology of air-fluidized granular media has been recently investigated experimentally and theoretically [2], considering the fluidized bed as a homogeneous medium. We propose to link these two approaches by measuring flow curves for polydisperse particles of different diameter regimes ranging from 70*m to 420*m. We find different rheological regimes depending on fluidization velocity and shear-rate, including Newtonian at low shear rate and Bagnoldian shear-thickening at high shear rate. We support the rheometry by light scattering to gain insights on the microscopic behavior of the aerated granular media in the future. [1] Geldart, D "Types of Gas Fluiditation", 1973 [2] O. D*Angelo, A. Shetty, M. Sperl, and W. T. Kranz, *The manifold rheology of fluidized granular media,* 2023.
Keywords: Rheology; Granular Matter; Fluidization; Geldart Regime