Time-dependent solutions for particle-size segregation in shallow granular avalanches
نویسندگان
چکیده
منابع مشابه
Time-dependent solutions for particle-size segregation in shallow granular avalanches
Rapid shallow granular free-surface flows develop in a wide range of industrial and geophysical flows, ranging from rotating kilns and blenders to rock-falls, snow slab-avalanches and debris-flows. Within these flows, grains of different sizes often separate out into inversely graded layers, with the large particles on top of the fines, by a process called kinetic sieving. In this paper, a rece...
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A general continuum theory for particle-size segregation and diffusive remixing in polydisperse granular avalanches is formulated using mixture theory. Comparisons are drawn to existing segregation theories for bi-disperse mixtures and the case of a ternary mixture of large, medium and small particles is investigated. In this case, the general theory reduces to a system of two coupled parabolic...
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Segregation and mixing of dissimilar grains is a problem in many industrial and pharmaceutical processes, as well as in hazardous geophysical flows, where the sizedistribution can have a major impact on the local rheology and the overall run-out. In this paper, a simple binary mixture theory is used to formulate a model for particlesize segregation and diffusive remixing of large and small part...
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When particles with different material properties are segregated by size or density they often have a subtle feedback on the local mobility of the granular material, which can significantly modify the bulk flow. Perhaps the most striking example of this segregation-mobility feedback occurs in geophysical mass flows, such as debris-flows, dense pyroclastic avalanches and snow avalanches. Larger ...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
سال: 2006
ISSN: 1364-5021,1471-2946
DOI: 10.1098/rspa.2005.1580