Regensburg 2025 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Granular Matter

DY 21.6: Vortrag

Mittwoch, 19. März 2025, 10:45–11:00, H43

Vibro-fluidized beds: A systematic dynamics study utilizing Diffusing Wave Spectroscopy — •Marlo Kunzner, Christopher Mayo, Matthias Sperl, and Jan Philipp Gabriel — Deutsches Zentrum für Luft- und Raumfahrt, Köln, Deutschland

Using a granular vibration fluidised bed, we demonstrate how our granular model system of polystyrene spheres becomes denser over time through different excitation amplitudes and how the heterogeneous dynamics of the system can be resolved with diffusing wave spectroscopy(DWS) measurements. We extract mean-square displacements from the DWS correlation functions of the sinusoidal excited system and model the excitation to extract the ballistic and diffusive time constants, as well as caging sizes, depending on applied acceleration and excitation time. At low excitations we observe a sub-diffusion power law behaviour of the MSD indicating potentially a glassy system.

Keywords: Light Scattering; Vibro-Fluidization; DWS; Jamming