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Rheology of weakly wetted granular materials: a comparison of experimental and numerical data

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Abstract

Shear cell simulations and experiments of weakly wetted particles (a few volume percent liquid binders) are compared, with the goal to understand their flow rheology. Application examples are cores for metal casting by core shooting made of sand and liquid binding materials. The experiments are carried out with a Couette-like rotating viscometer. The weakly wetted granular materials are made of quartz sand and small amounts of Newtonian liquids. For comparison, experiments on dry sand are also performed with a modified configuration of the viscometer. The numerical model involves spherical, monodisperse particles with contact forces and a simple liquid bridge model for individual capillary bridges between two particles. Different liquid content and properties lead to different flow rheology when measuring the shear stress-strain relations. In the experiments of the weakly wetted granular material, the apparent shear viscosity \(\eta _g\) scales inversely proportional to the inertial number \(I\), for all shear rates. On the contrary, in the dry case, an intermediate scaling regime inversely quadratic in \(I\) is observed for moderate shear rates. In the simulations, both scaling regimes are found for dry and wet granular material as well.

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Acknowledgments

We acknowledge the support of the ERASMUS program which allowed us to host FU during his Master study at the University of Twente. Helpful discussions with T. Weinhart, A. Singh, V. Magnanimo are appreciated. RS acknowledges the German Science Foundation (DFG) for funding parts of the work under Project No. SCHW 1168/6-1, and SL acknowledges the NWO/STW, VICI Grant 10828, and the DFG, project SPP1482 B12, for partial financial support. Finally, we acknowledge the constructive criticism of the referees of the paper.

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Authors and Affiliations

  1. Institute of Mechanics and Fluid Dynamics, TU Bergakademie Freiberg, Lampadiusstr. 4, 09596 , Freiberg, Germany

    Rüdiger Schwarze, Anton Gladkyy & Fabian Uhlig

  2. Multi Scale Mechanics (MSM), Engineering Technology (CTW) and MESA+, University of Twente, P.O.Box 217, 7500 AE , Enschede, The Netherlands

    Fabian Uhlig & Stefan Luding

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  1. Rüdiger Schwarze
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  2. Anton Gladkyy
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  4. Stefan Luding
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Correspondence to Stefan Luding.

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Schwarze, R., Gladkyy, A., Uhlig, F. et al. Rheology of weakly wetted granular materials: a comparison of experimental and numerical data. Granular Matter 15, 455–465 (2013). https://doi.org/10.1007/s10035-013-0430-z

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