Experimental measurements of orientation and rotation of dense 3D packings of spheres |
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Authors: | Matt Harrington Michael Lin Kerstin N. Nordstrom Wolfgang Losert |
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Affiliation: | 1. Department of Physics and IREAP, University of Maryland, College Park, MD, 20742, USA 2. Department?of Physics, IPST, and IREAP, University of Maryland, College Park, MD, 20742, USA
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Abstract: | Many recent advances in the study of granular media have stemmed from the improved capability to image and track individual grains in two and three dimensions. While two-dimensional systems readily yield both translational and rotational motion, a challenge in three-dimensional experiments is the tracking of rotational motion of isotropic particles. We propose an extension of the refractive index matched scanning technique as a method of measuring individual particle rotation. Initial measurements indicate that shear-driven rotational motion may stem from gear-like motion within the shear zone. |
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