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In our study of the avalanche dynamics of granular materials in the slumping regime of a 2D rotating drum, we employed digital image processing to measure the slope angle, and speckle visibility spectroscopy (SVS) to measure the time-resolved dynamics of the generated avalanches. It was found that steady and unsteady states alternately occur in an avalanche. In the steady state, granular temperature...
We design synchronized double speckle-visibility spectroscopy (SVS) equipment to measure the particle rearrangements within the passive layer of granular flows in a rotating drum. We determine that the particle rearrangements within the passive layer are triggered by granular avalanches occurring in the active layer. Particle rearrangements exhibit alternating small and large pairs, and a statistical...
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