Mathematics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........2w&link_type=abstract
PhD Thesis, Naturwissenschaftlich-Mathematische Gesamtfakultät der Universität Heidelberg, Germany. 141 pp. (2003)
Mathematics
1
Protoplanetary Accretion Disks, Solar Nebula
Scientific paper
Crystalline silicates and aliphatic hydrocarbons in comets as well as deuterated species in several solar system bodies indicate an extensive radial mixing in the primordial solar nebula, i.e. the protoplanetary accretion disk of our solar system. To study the radial transport of matter within protoplanetary disks it is essential to resolve the vertical direction since matter is mixed radially outward by the complex 2-dimensional flow of the disk. In this work I perform numerical models of protoplanetary accretion disks with radial and vertical mixing by solving a set of 2-dimensional transport-reaction equations for different tracers self-consistently together with the set of disk equations in the 1+1-dimensional approximation. The global velocity field of the disk is given by an analytical approximation of the meridional flow pattern. The meridional flow pattern in disks which was first deduced by Urpin (1984) exhibits an inward drift in the upper layers and an outward drift in the midplane in most parts of the disk. The turbulent diffusity is expressed by the β-prescription of the viscosity. The vertical self-gravity of the disk is included within the model. Tracers are silicate grains (forsterite, enstatite) which anneal in the warm inner parts of the disk and carbonaceous grains which combust by surface reactions with OH molecules. Considerable fractions of crystallized silicates and methane as a product of carbon combustion are transported to the site of comet formation afar from the protosun. The 2-dimensional transport of tracers in the solar nebula therefore offers an explanation for the crystalline silicates and methane in the comets.
No associations
LandOfFree
2-dimensionaler Stofftransport in protoplanetaren Akkretionsscheiben %t 2-dimensional transport of tracers in protoplanetary accretion disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with 2-dimensionaler Stofftransport in protoplanetaren Akkretionsscheiben %t 2-dimensional transport of tracers in protoplanetary accretion disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 2-dimensionaler Stofftransport in protoplanetaren Akkretionsscheiben %t 2-dimensional transport of tracers in protoplanetary accretion disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1550221