Publication Date:
2019-07-13
Description:
The apparent thermal conductivity of JSC-1A lunar regolith simulant was measured experimentally using a cylindrical apparatus. Eleven thermocouples were embedded in the simulant bed to obtain the steady state temperature distribution at various radial, axial, and azimuthal locations. The high aspect ratio of a cylindrical geometry was proven to provide a one-dimensional, axisymmetric temperature field. A test series was performed at atmospheric pressure with varying heat fluxes. The radial temperature distribution in each test fit a logarithmic function, indicating a constant thermal conductivity throughout the soil bed. However, thermal conductivity was not constant between tests at different heat fluxes. This variation is attributed to stresses created by thermal expansion of the simulant particles against the rigid chamber wall. Under stress-free conditions (20 deg C), the data suggest a temperature independent apparent conductivity of 0.1961 +/- 0.0070 W/m/ deg C
Keywords:
Lunar and Planetary Science and Exploration
Type:
AIAA Paper 2011-609
,
E-17668
,
49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition; Jan 04, 2011 - Jan 07, 2011; Orlando, FL; United States
Format:
application/pdf
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