A model for predicting coupled heat and mass transfers in unsaturated partially frozen soil

A one-dimensional model is used for simulating coupled heat and mass transfers in a vertical porous medium column, with the upper end subjected to a negative temperature. The model can predict accurately both temperature and total water content profiles along the column, provided that both heat- and...

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Bibliographic Details
Published in:The International journal of heat and fluid flow 1994-04, Vol.15 (2), p.163-171
Main Author: Giakoumakis, S.G.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
heat and mass transfers
medium hydraulic properties
soil freezing
Soils
surface-tension viscous-flow theory
Surficial geology
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Summary:A one-dimensional model is used for simulating coupled heat and mass transfers in a vertical porous medium column, with the upper end subjected to a negative temperature. The model can predict accurately both temperature and total water content profiles along the column, provided that both heat- and mass-conversation equations are solved simultaneously. On the contrary, when only heat transfer equation is solved, the position of the moving freezing front (isothermal of 273.16°K), is systematically underestimated. Moreover, it was shown that the commonly used surface-tension viscous-flow theory for estimating the temperature-dependent soil hydraulic properties (i.e., matric potential versus liquid water content, h[Θ 1], and hydraulic conductivity versus liquid water content, K[Θ 1]), when combined with the model, fails to describe satisfactorily the evolution of the freezing process.
ISSN:0142-727X
1879-2278
DOI:10.1016/0142-727X(94)90071-X