COLLISIONS OF POROUS CLUSTERS: A GRANULAR-MECHANICS STUDY OF COMPACTION AND FRAGMENTATION

The collision of granular clusters can result in a number of complex outcomes from sticking to partial or full destruction of the clusters. These outcomes will contribute to the size distribution of dust aggregates, changing their optical properties and their capability to contribute to solid-state...

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Bibliographic Details
Published in:The Astrophysical journal 2012-06, Vol.752 (2), p.1-13
Main Authors: RINGL, Christian, BRINGA, Eduardo M, BERTOLDI, Dalía S, URBASSEK, Herbert M
Format: Article
Language:English
Subjects:
Astrochemistry
Astronomy
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Clusters
Collisions
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
COSMIC DUST
Earth, ocean, space
Ejecta
Exact sciences and technology
FRAGMENTATION
IMPACT PARAMETER
Mathematical models
OPTICAL PROPERTIES
PLANETS
POROUS MATERIALS
PROTOPLANETS
Size distribution
SOLID CLUSTERS
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Summary:The collision of granular clusters can result in a number of complex outcomes from sticking to partial or full destruction of the clusters. These outcomes will contribute to the size distribution of dust aggregates, changing their optical properties and their capability to contribute to solid-state astrochemistry. We study the collision of two clusters of equal size, formed by approximately 7000 sub- mu m grains each, with a mass and velocity range that is difficult to sample in experiments. We obtain the outcome of the collision; compaction, fragmentation, and size distribution of ejecta, and type of outcome, as a function of velocity and impact parameter. We compare our results to other models and simulations, at both atomistic and continuum scales, and find some agreement together with some discrepancies. We also study collision-induced compaction as a function of cluster size, up to sizes of N = 250,000, and find that for large clusters considerably higher compactions result at higher velocities.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/752/2/151