The theoretical model of the present paper assumes the unit cell of the porous medium as composed of a cubic space with a cubic solid particle at the center. The thermal conductivity is evaluated by solving the heat conduction equation with the assumption of parallel isotherms within the cubic space. The liquid water in the porous medium is distributed around the solid particle according to the phenomena of adsorption and capillarity. The thermal conductivity of the gas present within the pores takes into account the thermal conductivity of the water vapor and dry air, without enhanced vapor diffusion. The model simplifies the variation of the relative humidity, from dryness to the field capacity, with a linear increase. The predicted results, compared to experimental data, show the agreement is very good at the temperatures in the range (30–50°C) and acceptable at 70°C. At high temperature (90°C) the predictions are higher than the experiments and a better agreement could be obtained by decreasing the thermal conductivity of the gas phase. Besides, the trend of the theoretical predictions is in good agreement with the experiments also at high temperatures.
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Theoretical Prediction of the Soil Thermal Conductivity at Moderately High Temperatures
Fabio Gori,
e-mail: gori@uniroma2.it
Fabio Gori
Department of Mechanical Engineering, University of Rome “Tor Vergata,” Via di Tor Vergata, 110, Rome, 00133, Italy
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Sandra Corasaniti
Sandra Corasaniti
Department of Mechanical Engineering, University of Rome “Tor Vergata,” Via di Tor Vergata, 110, Rome, 00133, Italy
Search for other works by this author on:
Fabio Gori
Department of Mechanical Engineering, University of Rome “Tor Vergata,” Via di Tor Vergata, 110, Rome, 00133, Italy
e-mail: gori@uniroma2.it
Sandra Corasaniti
Department of Mechanical Engineering, University of Rome “Tor Vergata,” Via di Tor Vergata, 110, Rome, 00133, Italy
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division July 20, 2001; revision received May 17, 2002. Associate Editor: C. T. Avedisian.
J. Heat Transfer. Dec 2002, 124(6): 1001-1008 (8 pages)
Published Online: December 3, 2002
Article history
Received:
July 20, 2001
Revised:
May 17, 2002
Online:
December 3, 2002
Citation
Gori, F., and Corasaniti, S. (December 3, 2002). "Theoretical Prediction of the Soil Thermal Conductivity at Moderately High Temperatures ." ASME. J. Heat Transfer. December 2002; 124(6): 1001–1008. https://doi.org/10.1115/1.1513573
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