Diffusion and Mixing in Gravity-Driven Dense Granular Flows

by: Jaehyuk Choi, Arshad Kudrolli, Rodolfo R Rosales, Martin Z Bazant

Physical Review Letters, Vol. 92, No. 17. (27 April 2004), 174301.

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Abstract

We study the transport properties of particles draining from a silo using imaging and direct particle tracking. The particle displacements show a universal transition from superdiffusion to normal diffusion; as a function of the distance fallen; independent of the flow speed. In the superdiffusive (but sub-ballistic) regime; which occurs before a particle falls through its diameter; the displacements have fat-tailed and anisotropic distributions. In the diffusive regime; we observe very slow cage breaking and Péclet numbers of order 100; contrary to the only previous microscopic model (based on diffusing voids). Overall; our experiments show that diffusion and mixing are dominated by geometry; consistent with long-lasting contacts but not thermal collisions; as in normal fluids.

@article{citeulike:2281600, abstract = {We study the transport properties of particles draining from a silo using imaging and direct particle tracking. The particle displacements show a universal transition from superdiffusion to normal diffusion; as a function of the distance fallen; independent of the flow speed. In the superdiffusive (but sub-ballistic) regime; which occurs before a particle falls through its diameter; the displacements have fat-tailed and anisotropic distributions. In the diffusive regime; we observe very slow cage breaking and P\'{e}clet numbers of order 100; contrary to the only previous microscopic model (based on diffusing voids). Overall; our experiments show that diffusion and mixing are dominated by geometry; consistent with long-lasting contacts but not thermal collisions; as in normal fluids.}, author = {Choi, Jaehyuk and Kudrolli, Arshad and Rosales, Rodolfo R. and Bazant, Martin Z. }, citeulike-article-id = {2281600}, doi = {10.1103/PhysRevLett.92.174301}, journal = {Physical Review Letters}, keywords = {flow, grains, gravity}, month = {April}, number = {17}, pages = {174301+}, posted-at = {2008-04-27 00:56:39}, priority = {2}, publisher = {American Physical Society}, title = {Diffusion and Mixing in Gravity-Driven Dense Granular Flows}, url = {http://dx.doi.org/10.1103/PhysRevLett.92.174301}, volume = {92}, year = {2004} }

RIS record

TY - JOUR ID - citeulike:2281600 TI - Diffusion and Mixing in Gravity-Driven Dense Granular Flows JF - Physical Review Letters VL - 92 IS - 17 SP - 174301 PB - American Physical Society N2 - We study the transport properties of particles draining from a silo using imaging and direct particle tracking. The particle displacements show a universal transition from superdiffusion to normal diffusion; as a function of the distance fallen; independent of the flow speed. In the superdiffusive (but sub-ballistic) regime; which occurs before a particle falls through its diameter; the displacements have fat-tailed and anisotropic distributions. In the diffusive regime; we observe very slow cage breaking and Péclet numbers of order 100; contrary to the only previous microscopic model (based on diffusing voids). Overall; our experiments show that diffusion and mixing are dominated by geometry; consistent with long-lasting contacts but not thermal collisions; as in normal fluids. KW - flow KW - grains KW - gravity AU - Choi, Jaehyuk AU - Kudrolli, Arshad AU - Rosales, Rodolfo AU - Bazant, Martin PY - 2004/04/27/ UR - http://dx.doi.org/10.1103/PhysRevLett.92.174301 ER -

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