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Density waves in dry granular media falling through a vertical pipe

T. Raafat, J. P. Hulin, H. J. Herrmann

cond-matarXiv:cond-mat/9603189

Abstract

We report experimental measurements of density waves in granular materials flowing down in a capillary tube. The density wave regime occurs at intermediate flow rates between a low density free fall regime and a high compactness slower flow.

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