BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 13: Granular Physics 3 - organized by Matthias Sperl (Köln)
DY 13.4: Vortrag
Montag, 22. März 2021, 16:00–16:20, DYc
Numerical investigation of the rheology of elongated particles — •Ellák Somfai1, Dániel Nagy1, Philippe Claudin2, and Tamás Börzsönyi1 — 1Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary — 2Physique et Mécanique des Milieux Hétérogènes, PMMH UMR 7636 CNRS, ESPCI Paris, PSL University Sorbonne Université, Université de Paris, Paris, France
We performed discrete element model simulations to investigate the rheology of a realistic 3-dimensional frictional granular material consisting of elongated particles. Such systems develop orientational ordering when exposed to shear flow. The degree of this ordering depends on the interparticle friction and particle elongation in a nontrivial manner. Namely, the shear induced orientational ordering is in principle increasing with particle elongation, but the characteristics of collisional and frictional interactions between neighbours (which hinder each others rotation) changes with the interparticle friction coefficient. We measured how key rheological quantities, including effective friction and normal stress differences depend on these two key parameters. We found that the aspect ratio dependence of the effective friction is non-monotonic not only for frictionless particles as we saw earlier, but also for frictional particles up to interparticle friction coefficient µp 0.4, – a range already relevant for every day materials. For higher µp the effective friction is monotonically increasing. We can explain the microscopic origins of both the non-monotonic behaviour for small and intermediate µp and the monotonic one for large µp.