Thermal conductivity modelling of terrestrial soil media - A comparative study

被引:23
作者
Usowicz, B.
Lipiec, J.
Marczewski, W.
Ferrero, A.
机构
[1] Polish Acad Sci, Inst Agrophys, PL-20290 Lublin, Poland
[2] Polish Acad Sci, Ctr Space Res, PL-00716 Warsaw, Poland
[3] CNR, Inst Agr & Earth Moving Machines, I-10126 Turin, Italy
关键词
thermal conductivity prediction; statistical-physical model; soil water; soil porosity; temperature;
D O I
10.1016/j.pss.2006.05.018
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The paper describes prediction of thermal conductivity in terrestrial soil media. The model operates statistically by probability of occurrence for contacts between particular fractional compounds. It combines physical properties, specific to particular compounds, into one apparent conductance specific to the mixture. The concept of substituting grain compounds by hypothetical spheres is an essential tool to control porosity by the number of spheres, their radii and probability of contacts between them. The spheres are equal in radii. The spheres substitute compounds, regardless of the phase state. Control of particular phase states is possible by means of specific properties assigned to the spheres, at the input to the model. Performance of the model is successfully proved for many diverse terrestrial soil media in a wide range of bulk density, composition, water and water vapour content. Only the compounds of sand decline from the expected values and require introducing a correction to the thermal conductivity of sand grains. One possible explanation is that the thermal conductivity of sand is uncertain. Nevertheless, the model is useful and worth extending beyond terrestrial purposes. (c) 2006 Elsevier Ltd. All rights reserved.
引用
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页码:1086 / 1095
页数:10
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