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How granular materials jam in a hopper (processed)

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Uploaded on Dec 6, 2009

How granular materials jam in a hopper, by Junyao Tang and R.P. Behringer, Duke Physics:
Through processing high-speed video, we can track the movement of particles that eventually form the jamming arch, and mark them with different color by computer, so that we can visualize how these "arch particles" come togther to stop the granular flow. As we can see, these arch particles are from highly disparate regions with no obvious correlation to each other. The orginal high-speed video is here:
http://www.youtube.com/watch?v=Nicn4g...

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