Temperature evolution and vapour pressure build-up in porous ices

Details Temperature evolution and vapour pressure build-up in porous ices Temperature evolution and vapour pressure build-up in porous ices

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1311k&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 10, p. 1311-1323.

Physics

9

Comet Nuclei, Ice, Porous Materials, Thermodynamic Properties, Vapor Pressure, Giotto Mission, Grain Size, Halley'S Comet

Scientific paper

Different types of nonvolatile materials were used to simulate the effect of dust mantles on heating and vapor pressure of an underlying porous ice sample. The flow resistance of the mantle material caused a measurable pressure buildup inside the sample and a temperature rise larger than would be expected from a freely sublimating icy surface exposed to the same energy input. Different mantle grain sizes resulted in similar vapor pressures and ice temperatures. Experiments using pure ice confirmed theoretical estimates and model calculations predict that deviations from the equilibrium vapor pressure should be small inside porous water ice. Admixture of a darkening agent in very small amounts to the water out of which the porous ice is produced resulted in a significant reduction of the vapor pressure inside the pores.

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