Growth and Form of Planetary Seedlings: Results from a Sounding Rocket Microgravity Aggregation Experiment
Abstract
In a second microgravity experiment on the formation of dust agglomerates by Brownian motioninduced collisions we find that the agglomerates have fractal dimensions as low as 1.4. Because of much better data, we are now able to derive the diffusion constant of the agglomerates as a function of mass, to show that a power law with an exponent of 1.7 describes the temporal evolution of the mean agglomerate mass very well and to prove that the collision cross section is proportional to the geometrical cross section. In addition to that we derived the universal massdistribution function of the agglomerates.
 Publication:

Physical Review Letters
 Pub Date:
 July 2004
 DOI:
 10.1103/PhysRevLett.93.021103
 Bibcode:
 2004PhRvL..93b1103K
 Keywords:

 96.35.Cp;
 45.70.n;
 61.43.Hv;
 81.10.Mx;
 Granular systems;
 Fractals;
 macroscopic aggregates;
 Growth in microgravity environments