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Neutron Radiography Studies of Water Self-Diffusion in Porous Medium

100%
Milczarek J., Fijał-Kirejczyk I., Chojnowski M., Żołądek J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1237-1244
EN
The results of neutron radiography studies on macroscopic self-diffusion of water confined within rigid porous material reveal the substantial reduction in diffusion constant in comparison to the diffusion in large volume. The studies performed in the 30-50°C temperature range on fired clay brick of 30% porosity show decrease in diffusion constant to approximately 17% of its value for free space and the Archie exponent is 1.4. The Arrhenius law was confirmed and the activation energy was found of the same value as in the water bulk.
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Effect of Gravitation on Water Migration in Granular Media

88%
Milczarek J., Fijał-Kirejczyk I., Żołądek J., Chojnowski M., Kowalczyk G.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 4
1245-1254
EN
The results of the experiments on water migration in unsaturated granular media performed with dynamic neutron radiography technique are presented. It was found that the porosity of the medium did not determine the kinetics of the process in a marked way. The influence of gravity was found to be considerable for media like coarse sand and gravel, consisting of large grains. No effect of gravitation on the water migration in clay beds was observed. The results are discussed in terms of the classical Washburn-Bosanquet theory of adhesion driven motion of the liquid in a straight circular capillary under gravity. It was found that this theory provides only qualitative description of the water migration within granular media, and the viscous dissipation effects are greatly underestimated.
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