On the Brink of Jamming: Granular Convection in Densely Filled Containers

by: Frank Rietz, Ralf Stannarius

Physical Review Letters, Vol. 100, No. 7. (2008)

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Abstract

Granulates are ubiquitous in nature and technology, but, despite their great importance, their dynamics are by far less well understood than those of liquids. We demonstrate in an almost compactly filled flat (Hele-Shaw) cell, where slow horizontal rotation simulates a variable gravitational force, that unexpected dynamic structures may arise under geometrical restrictions. The cell motion drives regular flow in the compact interior, and convection rolls combine with segregation. The container fill level is crucial for the dynamic regime. A transition from chute flow at lower fill levels to convection in densely packed containers is found. These observations suggest the existence of comparable phenomena in situations where so far no systematic search for dynamic patterns has been performed.

@article{citeulike:2419871, abstract = {Granulates are ubiquitous in nature and technology, but, despite their great importance, their dynamics are by far less well understood than those of liquids. We demonstrate in an almost compactly filled flat (Hele-Shaw) cell, where slow horizontal rotation simulates a variable gravitational force, that unexpected dynamic structures may arise under geometrical restrictions. The cell motion drives regular flow in the compact interior, and convection rolls combine with segregation. The container fill level is crucial for the dynamic regime. A transition from chute flow at lower fill levels to convection in densely packed containers is found. These observations suggest the existence of comparable phenomena in situations where so far no systematic search for dynamic patterns has been performed.}, author = {Rietz, Frank and Stannarius, Ralf }, citeulike-article-id = {2419871}, doi = {http://dx.doi.org/10.1103/PhysRevLett.100.078002}, journal = {Physical Review Letters}, keywords = {granular, qualifier}, number = {7}, posted-at = {2008-02-23 22:07:00}, priority = {2}, publisher = {APS}, title = {On the Brink of Jamming: Granular Convection in Densely Filled Containers}, url = {http://dx.doi.org/10.1103/PhysRevLett.100.078002}, volume = {100}, year = {2008} }

RIS record

TY - JOUR ID - citeulike:2419871 L3 - citeulike-article-id:2419871 TI - On the Brink of Jamming: Granular Convection in Densely Filled Containers JF - Physical Review Letters VL - 100 IS - 7 PB - APS N2 - Granulates are ubiquitous in nature and technology, but, despite their great importance, their dynamics are by far less well understood than those of liquids. We demonstrate in an almost compactly filled flat (Hele-Shaw) cell, where slow horizontal rotation simulates a variable gravitational force, that unexpected dynamic structures may arise under geometrical restrictions. The cell motion drives regular flow in the compact interior, and convection rolls combine with segregation. The container fill level is crucial for the dynamic regime. A transition from chute flow at lower fill levels to convection in densely packed containers is found. These observations suggest the existence of comparable phenomena in situations where so far no systematic search for dynamic patterns has been performed. KW - granular KW - qualifier AU - Rietz, Frank AU - Stannarius, Ralf PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevLett.100.078002 ER -

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