Granular Avalanches in Fluids
نویسندگان
چکیده
منابع مشابه
Granular avalanches in fluids.
Three regimes of granular avalanches in fluids are put in light depending on the Stokes number St which prescribes the relative importance of grain inertia and fluid viscous effects and on the grain/fluid density ratio r. In gas (r>>1 and St>1, e.g., the dry case), the amplitude and time duration of avalanches do not depend on any fluid effect. In liquids (r approximately 1), for decreasing St,...
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Granular avalanches are one of the fundamental grain transport mechanisms in our natural environment and in many industrial grain-processing flows. In recent years significant progress has been made in describing the flow of granular avalanches over complex rigid topography. Often the fluid-like granular avalanches flow over a region of solid-like grains at which there may be erosion or deposit...
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A fine analysis of the statistics of dry granular avalanches in a rotating drum setup reveals that, beyond the fluctuations, the angle at which an avalanche ends is correlated experimentally to the angle at which the avalanche starts. This correlation resulting from inertia defines an intermediate "neutral" angle that characterizes the corresponding granular pile. In addition, an intensive stud...
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The SavageHutter theory fo r granula r avalanches assumes that the g ranula r materia l is in either of two limiting stress sta tes, depending on whether the motion is convergent o r di ve rgent. At transitions be tween conve rgent and dive rgent regions, aj ump in stress occurs, which necessarily implies that there is a jump in the avalanche velocity and /or its thickness. In this paper, a reg...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2003
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.90.044301