Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session B57: Physics of Granular Media
11:15 AM–2:15 PM,
Monday, March 5, 2018
LACC Room: 518
Sponsoring Units: GSOFT DMP DFD GSNP
Chair: David Henann, Brown Univ
Abstract: B57.00003 : Granular flow in confined geometries: jamming, clogging, and instability
12:03 PM–12:15 PM
In this talk, we will discuss three small-scale granular experiments, all prepared in two dimension: (1) drag friction in a granular medium [1-3], (2) granular statics and dynamics in a certain hopper , and (3) meandering airflow in a granular medium (Fig. 1) . For the drag friction, we highlight the divergence of the friction force towards the jamming transition and a simple physical explanation for it. For the hopper problem, we discuss the statics of an unstable state and the dynamics of bubbles and its connection to clogging, again in simple physical frameworks. For the meandering problem, we discuss the mechanism of its destabilization and stabilization, together with a quasi-static nature. In all cases, we derive scaling laws for the phenomena on physical grounds, which agree well with experiments.
 Yuka Takehara and Ko Okumura, Phys. Rev. Lett. 112 (2014) 148001.
 Yuka Takehara, Sachika Fujimoto and Ko Okumura, EPL (Europhys. Lett.) 92, 44003 (2010).
 Ko Okumura, Phil. Mag. 96, 828-841 (2016).
 Yui Yagisawa, Hui Zee Then, Ko Okumura, Sci. Rep. 6, 25065; doi: 10.1038/srep25065 (2016).
 Yuki Yoshimura, Yui Yagisawa, and Ko Okumura, Sci. Rep. 6, 38457 (2016); doi:10.1038/srep38457.
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