Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..383k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 5, p. 383-389
Mathematics
Logic
17
Comet Nuclei, Comets, Cosmic Dust, Gas Transport, Ice, Interstellar Gas, Mathematical Models, Mixtures, Porous Materials, Rocks, Sintering, Thermal Conductivity, Boundary Conditions, Energy Transfer, Glaciers
Scientific paper
The aim of this work is to improve the method of calculating the thermoconductivity of porous ices and porous icy/rocky mixtures. The main interest are planetological applications, mostly for the physics of comets as well as icy satellites. However, the results could -- in modified form -- also be applied to the Earth's glaciers. The present work is an extension of an existing model of thermoconductivity of porous ice given by Steiner and Koemle (1991), which takes into account energy transport by gas and by contact points between grains, but with the simplifying assumption that the structure of the material remains unchanged during thermal evolution. Now the sintering of ice grains, which leads to a continuous growth of the grain-to-grain contact area (Hertz factor) is incorporated into the thermal evolution model. Example calculations illustrating the effect of grain sintering on thermal evolution in different temperature ranges are performed, using initial and boundary conditions suitable to the geometry used in the 'comet simulation' experiments described in Koemle et al. (1991, 1992). It was found that the grain sintering process, which was commonly neglected in previous studies of the thermoconductivity of ice, may lead to significant changes of the matrix conductivity on time scales of hours to days. Therefore, it should also play an important role in the thermal history of comet nuclei and thus affect the gas and dust emission activity of comets.
Kargl Guenter
Koemle Norbert I.
Kossacki Konrad J.
Steiner Gerhard
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