Delayed transitions between fluid-like and solid-like granular states |
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Authors: | T Shinbrot |
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Institution: | (1) Dept. of Biomedical Engineering, Rutgers University, Piscataway, NJ 08854, USA |
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Abstract: | Analysis of granular flows has been a significant theoretical challenge over
the past several decades. These flows are difficult to analyze largely
because they exhibit both solid-like and fluid-like behaviors side-by-side
in single experiments. In this paper, we examine two experiments in which
the co-existence between these states is especially marked and leads to
unique patterns that may serve as signatures for underlying granular
dynamics deserving of further scrutiny. In these experiments, we find that
when fluidization of grains is prolonged — as can be expected to occur for
example under reduced gravity environments or under conditions of strong
kinetic forcing (e.g. during earthquakes) — grains can produce residual
depositional patterns that are difficult to distinguish from fluvial
deposits. This suggests that geological landforms under low gravity (for
example on Mars) or influenced by strong forcing (for example during
earthquakes) may behave in a fluid-like manner despite being entirely dry. |
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Keywords: | 47 55 Kf Particle-laden flows 45 70 Qj Pattern formation |
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