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

Abstract

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.

Authors:
;  [1]; ;  [2]
  1. Physics Department and Research Center OPTIMAS, University Kaiserslautern, Erwin-Schroedinger-Strasse, D-67663 Kaiserslautern (Germany)
  2. CONICET and Instituto de Ciencias Basicas, Universidad Nacional de Cuyo, Mendoza 5500 (Argentina)
Publication Date:
OSTI Identifier:
22036976
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 752; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; COSMIC DUST; FRAGMENTATION; IMPACT PARAMETER; OPTICAL PROPERTIES; PLANETS; POROUS MATERIALS; PROTOPLANETS; SOLID CLUSTERS

Citation Formats

Ringl, Christian, Urbassek, Herbert M., Bringa, Eduardo M., and Bertoldi, Dalia S., E-mail: urbassek@rhrk.uni-kl.de. COLLISIONS OF POROUS CLUSTERS: A GRANULAR-MECHANICS STUDY OF COMPACTION AND FRAGMENTATION. United States: N. p., 2012. Web. doi:10.1088/0004-637X/752/2/151.
Ringl, Christian, Urbassek, Herbert M., Bringa, Eduardo M., & Bertoldi, Dalia S., E-mail: urbassek@rhrk.uni-kl.de. COLLISIONS OF POROUS CLUSTERS: A GRANULAR-MECHANICS STUDY OF COMPACTION AND FRAGMENTATION. United States. doi:10.1088/0004-637X/752/2/151.
Ringl, Christian, Urbassek, Herbert M., Bringa, Eduardo M., and Bertoldi, Dalia S., E-mail: urbassek@rhrk.uni-kl.de. Wed . "COLLISIONS OF POROUS CLUSTERS: A GRANULAR-MECHANICS STUDY OF COMPACTION AND FRAGMENTATION". United States. doi:10.1088/0004-637X/752/2/151.
@article{osti_22036976,
title = {COLLISIONS OF POROUS CLUSTERS: A GRANULAR-MECHANICS STUDY OF COMPACTION AND FRAGMENTATION},
author = {Ringl, Christian and Urbassek, Herbert M. and Bringa, Eduardo M. and Bertoldi, Dalia S., E-mail: urbassek@rhrk.uni-kl.de},
abstractNote = {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.},
doi = {10.1088/0004-637X/752/2/151},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}