Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...27...60h&link_type=abstract
Physics of the Earth and Planetary Interiors, vol. 27, Oct. 1981, p. 60-71.
Physics
5
Gas Pressure, Interstices, Lunar Soil, Thermal Conductivity, Apollo 12 Flight, Mars Surface, Regolith, Space Environment Simulation, Vacuum Tests, Moon, Apollo 12, Soils, Samples, Lunar, Pressure, Conductivity, Grains, Thermal Properties, Procedure, Density, Regolith, Eolian Processes, Mars, Surface, Brightness Temperature, Comparisons, Models, Water, Experiments, Distribution, Equipment, Data, Carbon Dioxide, Analogs, Basalts, Gases
Scientific paper
The thermal conductivity of a simulated Apollo 12 soil sample is measured as a function of interstitial gas density, and implications for the thermal properties of lunar and Martian regolith are discussed. Measurements were performed for samples consisting of a mixture of Knippa and Berkely basalt powders with a grain size distribution identical to that of Apollo 12 lunar soil samples by the needle probe technique at interstitial pressures of He, N2, Ar and CO2 from 133,000 to 0.0133 Pa. It is shown that sample thermal conductivity decreases with decreasing interstitial gas pressure down to 1.0 Pa, due to the decreasing effective thermal conductivity of interstitial gas with decreasing gas pressure. Constant thermal conductivity values of 8.8 mW/m per K and 10.9 mW/m per K are obtained for sample densities of 1.70 and 1.85 g/cu cm, respectively, in agreement with in situ lunar regolith measurements. The results, which are greater than those obtained in previous soil studies, are explained by the dense packing of soil particles and enhanced intergranular thermal contact in the present experimental configuration, rather than the influence of interstitial gas pressure. The differences in conductivity between loose soils and packed regolith may also be used to account for the two peaks observed in Martian surface thermal inertia data.
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