NDLI: Canadian Field Soils III. Thermal-Conductivity Data and Modeling

Content Provider	Springer Nature Link
Author	Tarnawski, V. R. Momose, T. McCombie, M. L. Leong, W. H.
Copyright Year	2014
Abstract	Forty field soil samples, from nine Canadian Provinces, were laboratory tested for their ability to conduct heat, i.e., thermal conductivity ( $$\lambda $$ ), using a non-stationary probe technique. The measurements were carried out on moderately compacted samples at room temperature, and over a full range of degree of saturation ( $$S_{\mathrm{r}})$$ ranging from dryness to full saturation. The analysis of $$\lambda $$ data revealed a strong nonlinear variation of $$\lambda $$ versus $$S_{\mathrm{r}}$$ that can be sub-analyzed in four $$S_{\mathrm{r}}$$ -based domains, i.e., residual, transitory meniscus, micro/macro-porous capillary, and superfluous. In the residual domain ( $$0 < S_{\mathrm{r}}< S_{{\hbox {r-cr}}})$$ , a very small $$\lambda $$ variation is observed. In the transitory meniscus domain ( $$S_{{\hbox {r-cr}}} < S_{\mathrm{r}} < S_{{\hbox {r-}\mathrm{PWP}}})$$ , for the majority of soils, a sharp $$\lambda $$ increase was observed. In the micro/macro-porous capillary domain ( $$S_{{\hbox {r-}\mathrm{PWP}}} < S_{\mathrm{r}} < S_{{\hbox {r-}\mathrm{FC}}})$$ , a moderate $$\lambda $$ increase was noted. Finally, in the superfluous domain ( $$S_{{\hbox {r-}\mathrm{FC}}} < S_{\mathrm{r}} < S_{{\hbox {r-sat}}})$$ , a very slight $$\lambda $$ increase was generally noted. On average, the highest $$\lambda $$ values (from 1.9 $$\hbox {W}{\cdot }\hbox {m}^{-1}{\cdot } \hbox {K}^{-1}$$ to 3.2 $$\hbox {W} {\cdot }\hbox {m}^{-1}{\cdot } \hbox {K}^{-1})$$ were obtained from saturated soil samples with high quartz content, e.g., samples from sites in Nova Scotia and Prince Edward Island. On the other hand, the lowest $$\lambda $$ (from 1.1 $$\hbox {W}{\cdot }\hbox {m}^{-1}{\cdot }\hbox {K}^{-1}$$ to 1.4 $$\hbox {W}{\cdot }\hbox {m}^{-1}{\cdot }\hbox {K}^{-1})$$ was observed from saturated soil samples with lower quartz content, e.g., British Columbia samples. The measured data were used to verify a recently developed series–parallel (S– $${\vert }{\vert }$$ ) model for unsaturated soils. On average, estimates of the S– $${\vert }{\vert }$$ model, with a parallel arrangement of air and water in the third of three conductive paths, were within $${\pm }0.08\,\hbox {W}{\cdot }\hbox {m}^{-1}{\cdot }\hbox {K}^{-1}$$ of experimental data. However, the S– $${\vert }{\vert }$$ model, with a series arrangement of air and water in the third conductive path, showed slightly better estimates when it was applied to fine-textured soils. In addition, there was no strong correlation noted between the performance of the S– $${\vert }{\vert }$$ models and soil quartz content. Consequently, it is recommended to compare estimates from both models when they are applied to experimental data.
Starting Page	119
Ending Page	156
Page Count	38
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	36
Issue Number	1
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2014-12-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Canadian soils Mineral composition Quartz Series–parallel model Thermal conductivity Thermal probe Condensed Matter Physics Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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Canadian Field Soils I. Mineral Composition by XRD/XRF Measurements

Canadian Field Soils II. Modeling of Quartz Occurrence

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Advanced Geometric Mean Model for Predicting Thermal Conductivity of Unsaturated Soils

Basic Problems in Thermal-Conductivity Measurements of Soils

Canadian Field Soils III. Thermal-Conductivity Data and Modeling

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