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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...
Slowly rotating drums are important due to their industrial application, but also as a simple model system for studying transient avalanche processes. A speckle visibility spectroscopy (SVS) alongside a simple imaging technique was used to measure the time-resolved avalanching of 1.3mm diameter sand particles in a 35% full rotating drum operating in the slumping regime. The major difference from spherical...
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