Thermal conductivities and diffusivities of porous ice samples at low pressures and temperatures and possible modes of heat transfer in near surface layers of comets

Details Thermal conductivities and diffusivities of porous ice samples at low pressures and temperatures and possible modes of heat transfer in near surface layers of comets Thermal conductivities and diffusivities of porous ice samples at low pressures and temperatures and possible modes of heat transfer in near surface layers of comets

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302...77s&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 77-81 (SEE N90-19989 12-90)

Physics

2

Comet Nuclei, Cometary Atmospheres, Comets, Heat Transfer, Simulation, Thermal Conductivity, Thermal Diffusivity, Dust, Ice, Porosity, Ratios, Surface Properties

Scientific paper

Thermal conductivities of solid water ice, porous water ice and porous water ice/dust samples with porosities between 0.5 and 0.6 have been measured at a pressure of 1 Pa and at temperatures between 80 K and 170 K. The thermal conductivity was found to be 0.25 + or - 0.05 W/mK and to depend little on temperature and composition in the range of values considered. Thermal diffusivities and ratios between rates of matrix conductive heat transfer and heat transfer due to vapor flow have been estimated from the results of recent KOSI (comet simulation) experiments. The thermal diffusivities were between 10-7 and 10-8 powers sq m/sec and the ratio between vapor and matrix conductive heat ransfer was 10. Water vapor heat transfer is most likely less important if the near surface temperature of the Rosetta target comet is below 150 K. It is still possible, however, that vapors of more volatile phases contribute significantly to heat transfer.

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