Titre :
|
Thermo-osmotic and thermoelectric coupling in saturated soil
|
Auteurs :
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D. Gray
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Type de document :
|
rapport
|
Année de publication :
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1969
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Format :
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p. 66-77
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Langues:
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= Anglais
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Catégories :
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EAUX SOUTERRAINES EAU DANS LE SOL
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Mots-clés:
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ARGILE
;
ECOULEMENT EN MILIEU POREUX
;
HUMIDITE DU SOL
;
MESURE
;
THERMOELECTRICITE
;
MILIEU SATURE
;
EAU INTERSTITIELLE
|
Résumé :
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Thermally induced flows of moisture and electricity in saturated clays were measured experimentally as the water content, exchange capacity, and pore-water electrolyte concentration were systematically varied. Prior work on thermo-osmosis in soils is reviewed, and possible coupling mechanisms are discussed in the light of new experimental results.Thermo-osmotic pressures on the order of a few tenths of centimeter of water per degree Centigrade were measured with net flow occurring to either the warm or cold side. The peculiar temperature-dependence of activity coefficients of electrolytes in the pore water is suggested as a possible explanation for a given direction of moisture flow. Thermal contributions to moisture movement in saturated soils are minor compared to thermal moisture flow in partially saturated media.
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Source :
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Highway research board special report; Proceedings effects of temperature and heat on engineering behavior of soils, vol. 103
|