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Experimental and Numerical Analysis of Coupled Heat and Mass Transfers in a Partially Saturated Frozen Soil

M. Vauclin
Institute de Mècanique de Grenoble, LA CNRS n° 6 B.P. 68 - F.38402 Saint Martin D'Hères Cedex France

S. Giakoumakis
Institute de Mècanique de Grenoble, LA CNRS n° 6 B.P. 68 - F.38402 Saint Martin D'Hères Cedex France

J. P. Gaudet
Institute de Mècanique de Grenoble, LA CNRS n° 6 B.P. 68 - F.38402 Saint Martin D'Hères Cedex France

A. Albergel
Institute de Mècanique de Grenoble, LA CNRS n° 6 B.P. 68 - F.38402 Saint Martin D'Hères Cedex France

Аннотация

Progressive freezing of unsaturated soils induces water flow from warm to cold regions. Because the frozen zone acts as a sink, the migration of water is continuous as long as the temperature gradient exists and an external water supply is available. The moisture migration and the freezing processes are strongly coupled and jointly affect the temperature field. The overall process, with or without frost heaving, is important in many practical areas such as civil engineering, hydrology and agriculture for both seasonal frost and permafrost regions.
Rigorous theories or at least theoretical equations and their numerical solutions have been proposed by many authors (|1| to |9|) to describe heat and mass transfers in freezing porous media. Other investigators have performed extensive laboratory (|10| to |14|) or field (|15|, |16|) tests. However few attempts (|9|) have been done to make direct comparisons between theoretical and experimental results, because maybe, of difficulties in the experimental determination of the proper parameters which control the physical processes.
This study presents a comparison between a numerical solution of the coupled heat and mass transfer equations with phase change and experimental results obtained on a vertical column of sandy soil submitted to various initial and boundary conditions.

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