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DY: Fachverband Dynamik und Statistische Physik

DY 31: Particulate Matter I: From microscopic interactions to collective motion (Focus session)

DY 31.6: Vortrag

Mittwoch, 22. März 2017, 11:30–11:45, ZEU 118

Shear-driven segregation of dry granular materials with different friction coefficients — •Tamás Börzsönyi, Katalin Gillemot, and Ellák Somfai — Wigner Research Centre for Physics, Budapest, Hungary

We present experimental and numerical results about bulk segregation in a shear-driven dry granular mixture, where the particles only differ in their surface friction coefficients. We show that the smoother particles tend to sink to the bottom of the shear zone, while rough particles migrate to the top of the sample. This phenomenon is similar to the well known kinetic sieving in particle mixtures with size heterogeneity. In the present case the smooth particles have a higher probability to penetrate into voids created by the shearing than the rough ones. The experimentally observed patterns were reproduced by discrete element simulations. Moreover, simulations performed in the absence of gravity revealed, that rough particles tend to stay in the shear zone, while the smooth particles are being expelled from it. We propose a mechanism, in which the smooth particles are driven towards regions of lower shear rate.

[1] K. A. Gillemot, E. Somfai, T. Börzsönyi, Soft Matter, 2016, DOI: 10.1039/C6SM01946C