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Velocity Correlations in Dense Granular Flows Observed with Internal Imaging

Velocity Correlations in Dense Granular Flows Observed with Internal Imaging

We show that the velocity correlations in uniform dense granular flows inside a silo are similar to the hydrodynamic response of an elastic hard-sphere liquid. The measurements are made using a fluorescent refractive-index-matched interstitial fluid in a regime where the flow is dominated by grains in enduring contact and fluctuations …