Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..104...97p&link_type=abstract
Icarus (ISSN 0019-1035), vol. 104, no. 1, p. 97-109.
Computer Science
7
Aerodynamic Heating, Chondrule, Conductive Heat Transfer, Fractionation, Gas Dynamics, Inclusions, Meteorites, Cosmochemistry, Melting, Meteoritic Composition, Refractory Materials, Shock Heating
Scientific paper
Results of calculations performed to determine the conditions necessary for producing the opaque rims on chondrules and CAI rims by high-speed entry into the transient atmosphere of an accreting meteorite parent body are presented. The sensitivity of these results to variations in critical parameters is investigated. The range of entry velocities which can produce such rims is shown to depend on the size, melting temperature, and thermal conductivity of the particles. For particles greater than 2 mm in radius, with thermal conductivities of 20,000 ergs/sm s K or lower, entry velocities of about 3 km/s suffice. For particle sizes less than 1 mm in radius, the range of encounter velocities that can produce rims is narrow or vanishing, regardless of the thermal conductivity, unless the melting temperature in the outer part of the chondrule has been reduced by compositional heterogeneity.
Bunch Ted E.
Cassen Pat
Podolak Morris
Prialnik Dina
Reynolds Richard
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