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Two-dimensional (2D) hopper flow of disks has been extensively studied. Here,we investigate hopper flow of ellipses with aspect ratio $\alpha = 2$, and wecontrast that behavior to the flow of disks. We use a quasi-2D hoppercontaining photoelastic particles to obtain stress/force information. Wesimultaneously measure the particle motion and stress. We determine severalproperties, including discharge rates, jamming probabilities, and the number ofparticles in clogging arches. For both particle types, the size of the opening,$D$, relative to the size of particles, $\ell$ is an important dimensionlessmeasure. The orientation of the ellipses plays an important role in flowrheology and clogging. The alignment of contacting ellipses enhances theprobability of forming stable arches. This study offers insight forapplications involving the flow of granular materials consisting of ellipsoidalshapes, and possibly other non-spherical shapes.

Orientation, Flow, and Clogging in a Two-Dimensional Hopper: Ellipses vs. Disks