Effect of Gravitation on Water Migration in Granular Media

Autor:	J. Żołądek, M. Chojnowski, J.J. Milczarek, I.M. Fijał-Kirejczyk, G. Kowalczyk
Rok vydání:	2008
Předmět:	Condensed Matter::Soft Condensed Matter Physics Gravitation Viscous dissipation Gravity (chemistry) Classical mechanics Capillary action General Physics and Astronomy Granular media Mechanics Porosity Physics::Geophysics
Zdroj:	Acta Physica Polonica A. 113:1245-1254
ISSN:	1898-794X 0587-4246
DOI:	10.12693/aphyspola.113.1245
Popis:	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.
Databáze:	OpenAIRE
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