Analytical models for lunar soil thermal conductivity

Details Analytical models for lunar soil thermal conductivity Analytical models for lunar soil thermal conductivity

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975thph.confq....t&link_type=abstract

American Institute of Aeronautics and Astronautics, Thermophysics Conference, 10th, Denver, Colo., May 27-29, 1975, 9 p.

Physics

Astronomical Models, Lunar Soil, Mathematical Models, Thermal Conductivity, Apollo Flights, Conductive Heat Transfer, Density Distribution, Heat Transfer Coefficients, Radiative Heat Transfer, Thermophysical Properties

Scientific paper

Analytical models for estimating the thermal conductivity of the lunar soil are proposed for two different depth-density variations. The first case involves consideration of heat transfer by combined conduction and radiation in a powder bed of uniform spheres arranged in a repetitive packing pattern. The solid conductance is based on the constriction resistance for spheres in contact while the radiation contribution is evaluated by modelling the powder as a system of semitransparent multi-layers. For gas conduction, an analysis based on a variable characteristic conduction path is developed. Comparison with the experimental data on Apollo samples shows satisfactory agreement over a wide range of density, temperature and gas pressure variations. In the second part, an exponential variation of density with depth is assumed. The solid conductance is evaluated for a bed of uniform-size spheres that can assume random orientations about one another. Results of this new approach are in excellent agreement with the subsurface heat flow data and show that the depth is an important parameter in lunar heat transfer.

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