NTRS - NASA Technical Reports Server

Back to Results
Restructuring of Dust Aggregates in the Solar NebulaWe discuss the results of a recent effort to analyze the mechanical stability of dust aggregates with a detailed model of the physical properties of a contact between grains. This model contains both elastic repulsion forces and attractive van der Waals/dipole/metallic forces along with a description of the energy dissipation due to rolling, sliding, and breaking of contacts. We find that (1) aggregates formed from single sized grains via Particle-Cluster-Aggregation remain fluffy, (2) collisions with other aggregates and with large grains may lead to compaction (3) the velocities of small grains and aggregates in the early solar nebula are too small to produce marked compaction as long as the aggregates are small, and (4) internal restructuring of aggregates is a potentially large sink of energy which could enable the sticking of large bodies even at collision velocities of the order of several hundred cm/s.
Document ID
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Dominik, C.
(Leiden Univ. Netherlands)
Tielens, A. G. G. M.
(NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 17, 2013
Publication Date
October 1, 1996
Publication Information
Publication: From Stardust to Planetesimals: Contributed Papers
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available