Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Granular Matter / Contact Dynamics
DY 25.8: Talk
Wednesday, April 3, 2019, 11:45–12:00, H3
Structural similarity between dry and wet sphere packings — •Matthias Schröter1,2, Simon Weis3, and Gerd Schröder-Turk3, 4, 5 — 1Institute for Multiscale Simulation, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Max Planck Institute for Dynamics and Self-Organization, Göttingen — 3Institut für Theoretische Physik I, Friedrich-Alexander-Universität Erlangen-Nürnberg — 4Maths & Stats, School of Engineering and Information Technology, Murdoch University, Perth, Australia — 5Applied Maths, Research School of Physical Sciences & Engin., Australian National Univ., Canberra, Australia
The mechanical properties of granular materials change significantly in the presence of a wetting liquid which creates capillary bridges between the particles. Here we demonstrate, using X-ray tomographies of dry and wet sphere packings, that this change in mechanical properties is not accompanyied by structural differences between the packings. We characterize the latter by the average numbers of contacts of each sphere ⟨ Z⟩ and the shape isotropy ⟨ β02,0 ⟩ of the Voronoi cells of the particles. Additionally, we show that the number of liquid bridges per sphere ⟨ B⟩ is approximately equal to ⟨ Z⟩ + 2, independent of the volume fraction of the packing. These findings will be helpful in guiding the development of both particle-based models and continuum mechanical descriptions of wet granular matter.