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Berlin 2024 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 48: Granular Matter and Contact Dynamics

DY 48.4: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, BH-N 128

How to make Sense of Fluidized Bed Rheology using Shear Banding and Three Time Scales — •W. Till Kranz1,2, Olfa D’Angelo2,3, Olivier Coquand2,4, Abhishek Shetty5, and Matthias Sperl2,11University of Cologne, Germany — 2DLR, Germany — 3University of Erlangen, Germany — 4University of Perpignan, France — 5Anton Paar, USA

The rheology of granular fluids is surprisingly rich if agitation by shear is combined with fluidization and comprises ordinary Newtonian rheology as well as shear thinning and shear thickening regimes. We will report on careful measurements of air-fluidized glass beads in a Taylor-Couette shear cell [1]. We will sketch a procedure to extract quantitative rheological information spanning all the rheological regimes and summarized in only a handful of physically meaningful parameters. Taking into account shear banding this approach embraces and extends the well known empirical µ-I-rheology [2] of non-fluidized granular flows. Using simple arguments involving three relevant time scales, we will show how the seemingly complex rheology stems from intuitive and transparent physical principles [3].
[1] O. D’Angelo, A. Shetty, M. Sperl and W. T. Kranz, arXiv:2309.00413

[2] GDR Midi, EPJ E 14, 341 (2004)

[3] O. Coquand, W. T. Kranz and M. Sperl, arXiv:2008.05931

Keywords: Granular Fluid; Fluidized Bed; Rheology; Integration Through Transients

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