Statistics – Computation
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..114..237d&link_type=abstract
Icarus (ISSN 0019-1035), vol. 114, no. 2, p. 237-246
Statistics
Computation
113
Disks (Shapes), Dust, Nebulae, Nonlinear Systems, Planetary Evolution, Planetary Nebulae, Protoplanets, Scale Height, Sediment Transport, Turbulent Diffusion, Equilibrium Flow, Mixtures, Solar Corona, Vertical Distribution
Scientific paper
We present a self-consistent computation of the structure of the dust subdisk in the protoplanetary nebula. The main physical processes governing the dynamics of the dust disk are reviewed. A (nonlinear) vertical diffusion equation for the transport of dust particles is derived. It is based on a competition between sedimentation processes due to gravity and diffusion due to turbulence. The vertical structure of the subdisk is computed by solving numerically the diffusion equation. The influence of both the particle size and the strength of the turbulence is studied. Large particles are found to settle down toward their equilibrium distribution in a turbulent diffusive time scale. Small particles remain mixed throughout the whole gas disk. Simple analytical estimates of the dust scale height are given. They are found to agree closely with the exact numerical solutions. The implications of our results for cosmochemistry and the structure of the solar nebula are discussed.
Dubrulle Bérangère
Morfill Gregor
Sterzik Michael
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