Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...80..189m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 80, July 1989, p. 189-201.
Physics
20
Accretion Disks, Nebulae, Protoplanets, Solar System, Turbulent Flow, Grains, Interstellar Matter, Mass Spectra, Turbulent Diffusion, Planets, Solar System, Solar Nebula, Coagulation, Grains, Turbulence, Accretion, Diffusion, Drift, Spectra, Opacity, Timescale, Boundaries, Velocity, Size, Radius, Wavelengths, Parameters, Evolution, Formation, Origin, Planetesimals, Calculations, Models, Motion, Numerical Methods
Scientific paper
The present characterization of grain-coagulation processes in the turbulent accretion-disk solar nebula gives attention to turbulent diffusion, radial shift, and the supply of grains by the accreting interstellar cloud. If it is assumed that only thermal convection maintains turbulence, the initial convection terminates in the inner region due to decreasing opacity and the nebula becomes both radiative and laminar. If accretion continues during the laminar phase, thermal convection could be intermittent, interstellar grains would increase opacity beyond the threshold value for thermal convection, and turbulent grain growth with laminar planetesimal formation would be repeated.
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