Effects of Bottleneck on Granular Convection Cells and Segregation
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Dry glass granular material confined to a 2D-chamber convects when it is subjected to vertical sinusoidal vibrations of sufficient intensity. Effects of the container geometry on convection pattern and segregation process are studied experimentally. Here we introduce a bottleneck into the ordinary rectangular chamber, with one sidewall bended inward, characterized by λ being the ratio of the length of the bottleneck to the length of the chamber’s base. The convection roll and segregation pattern are significantly affected by λ. For λ = 0.9, two different stabilized patterns co-exist, depending on initial granular distribution. The sloping angle of the free surface to the horizontal increases with increasing λ, and reaches its saturation at λ = 0.9. The angle of the interface of the segregation region to the horizontal also increases with increasing λ.
KeywordsBottleneck Granular material Segregation Convection
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