NDLI: Compressive pressure dependent anisotropic effective thermal conductivity of granular beds

Content Provider	Springer Nature Link
Author	Garrett, Daniel Ban, Heng
Copyright Year	2011
Abstract	In situ planetary thermal conductivity measurements are typically made using a long needle-like probe, which measures effective thermal conductivity in the probe’s radial (horizontal) direction. The desired effective vertical thermal conductivity for heat flow calculations is assumed to be the same as the measured effective horizontal thermal conductivity. However, it is known that effective thermal conductivity increases with increasing compressive pressure on granular beds and the horizontal stress in a granular bed under gravity is related to the vertical stress through Jaky’s at rest earth pressure coefficient. The objectives of this study were to examine the validity of the isotropic property assumption and to develop a fundamental understanding of the effective thermal conductivity of a dry, noncohesive granular bed under uniaxial compression. A model was developed to predict the increase in effective vertical and horizontal thermal conductivity with increasing compressive vertical applied pressure. An experiment was developed to simultaneously measure the effective vertical and horizontal thermal conductivities of particle beds with needle probes. Measurements were made as compressive vertical pressure was increased to show the relationship between increasing pressure and effective vertical and horizontal thermal conductivity. The results of this experiment showed quantitatively the conductivity anisotropy for two different materials and validated the developed model. This model can be used to predict the anisotropic effective thermal conductivity of granular materials under uniaxial compressive pressures, and evaluate the uncertainties in lunar heat flow measurements.
Starting Page	685
Ending Page	696
Page Count	12
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	13
Issue Number	5
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Effective thermal conductivity Granular beds Anisotropic Compressive Pressure Heat transfer Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics Geoengineering, Foundations, Hydraulics Materials Science Industrial Chemistry/Chemical Engineering Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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