Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10748s&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10748
Other
Scientific paper
It is well known that porous materials are poor heat conductors compared to compact materials of the same composition. However, there is a widely spread and often used assumption that there would be a relation between porosity and thermal conductivity. Contrary to this, materials of the same porosity may differ in thermal conductivity by orders of magnitude. Heat conduction relies on continuous paths of solid material, i.e. contacts between single grains. Loose powders like regolith or fresh snow are very bad conductors, while old, sintered snow or cemented silicate powders conduct heat significanty better, though the porosity of both is very similar or even identical. In thermophysical comet models this effect is taken account of by introducing the Hertz-factor, a key property for the thermal evolution and the behaviour of comets. Thermal inertia maps of Mars (e.g. by TES) show large areas of intermediate inertia. The inherent ambiguity of low-res inertia maps cannot distinguish between rock-rich areas or rock-free areas of cemented regolith. The cementing agents may be volatiles such as water ice or CO2 ice, or salts, for example. In order to understand the influence of cementation or sintering on the thermal conductivity, we performed a series of measurements in vacuum. Samples with increasing degree of cementation are compared with each other. Finally, the hardness of each sample has been measured, because the hardness is also a measure for the degree of cementation.
Kargl Guenter
Kömle Norbert
Seiferlin Karsten
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