A model of the thermal conductivity of porous water ice at low gas pressures

Details A model of the thermal conductivity of porous water ice at low gas pressures A model of the thermal conductivity of porous water ice at low gas pressures

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..507s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, March 1991, p. 507-513.

Statistics

Computation

16

Computational Fluid Dynamics, Gas Pressure, Halley'S Comet, Ice, Porous Materials, Thermal Conductivity, Conductive Heat Transfer, Knudsen Flow, Low Pressure

Scientific paper

The study is concerned with energy transfer in porous water ice at large Knudsen numbers of the sublimated gas. A formula is given for the effective thermal conductivity, lambda(eff), which is found to be valid for a wide range of material parameters, in particular also for high porosity materials, where other expressions for lambda(eff) lose their validity. It is found that above about 190 K lambda(eff) increases strongly with temperature and depends mainly on the average grain size, while at low temperatures it is primarily controlled by the value of the Hertz-factor. The influence of the porosity is relatively weak.

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