Hydrodynamic model for particle size segregation in granular media
نویسندگان
چکیده
منابع مشابه
Hydrodynamic Model for Particle Size Segregation in Granular Media
We present a hydrodynamic theoretical model for “Brazil nut” size segregation in granular materials. We give analytical solutions for the rise velocity of a large intruder particle immersed in a medium of monodisperse fluidized small particles. We propose a new mechanism for this particle size-segregation due to buoyant forces caused by density variations which come from differences in the loca...
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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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Particle-size segregation commonly occurs in both wet and dry granular free-surface flows through the combined processes of kinetic sieving and squeeze expulsion. As the granular material is sheared downslope, the particle matrix dilates slightly and small grains tend to percolate down through the gaps, because they are more likely than the large grains to fit into the available space. Larger p...
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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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ژورنال
عنوان ژورنال: Physica A: Statistical Mechanics and its Applications
سال: 2003
ISSN: 0378-4371
DOI: 10.1016/s0378-4371(03)00621-6