[en] The article discusses the underlying hypothesis, the limits, the range of application, and the practical operation of a versatile thermal conductivity analyzer based on a transient cylindrical probe method. The best expected precision for the conductivity determination appears to be ~±10%. A compact analyzer, integrating all the apparatus' components in the same unit, has been specifically designed for environmental research in the field. Calibration received special attention regarding thermal conductivity values in the range 0.1–3 W/mK. The analyzer was tested on seven materials, in field conditions, and discrepancies from published conductivity values did not exceed 9%. Several checks were performed in the laboratory to study the influence of experimental conditions, such as the probe insertion technique. The cylindrical probe method appears well suited to powdered materials, but may also be applied to viscous liquids and solid matter. As an application, the cylindrical probe was used to characterize nine soils from the Belgian Lorraine. After soil analysis in the dry state, thermal conductivity of each sample was determined at different moisture contents. The transient cylindrical probe method proved to be quick and easy, whether in situ or on samples in the laboratory. It is a powerful tool which can map a country's soil thermal properties.
Disciplines :
Energy
Author, co-author :
Nicolas, Jacques ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Surveillance de l'environnement
Andre, Philippe ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Surveillance de l'environnement
Rivez, Jean-François
Debbaut, Vincent ; Université de Liège - ULiège > Services administratifs généraux > Protection et hygiène du travail (SUPHT) - Département des sciences et gestion de l'environnement
Language :
English
Title :
Thermal conductivity measurements in soil using an instrument based on the cylindrical probe method
Publication date :
1993
Journal title :
Review of Scientific Instruments
ISSN :
0034-6748
eISSN :
1089-7623
Publisher :
American Institute of Physics, New York, United States - New York
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