Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..497r&link_type=abstract
In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 497-500 (SEE N93-19113 06-90)
Other
1
Comets, Crusts, Ice, Sintering, Evaporation, Mass Transfer, Mathematical Models, Water Vapor
Scientific paper
It is demonstrated by experiments and theoretical considerations that sintering processes, so far used to describe the densification of metal and ceramic powders, are relevant for icy materials and therefore probably also for comets. A theoretical model is presented which describes the evolution of so called sinter necks, the contact zone between ice particles. With this model the strength increase of a porous, loosley packed icy body is calculated in which the sinter necks grow by evaporation and condensation of water vapor at a constant temperature. Experiments with ice powders validate the model qualitatively. An increase in strength up to a factor of four is observed during isothermal sintering. In order to check the relevance of the experimental results and the basic theoretical ideas with respect to real comets, more exact theories and improved experiments taking into account additional mass transport mechanisms are needed.
Kochan Hermann
Ratke Lorenz
Thomas Helmuth
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