The mechanism by which water moves through a porous material subjected to a temperature gradient. I. Introduction of a vapor gap into a saturated system

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TypeArticle
Journal titleSoil Science
ISSN0038-075X
Volume84
Issue4
Pages291299; # of pages: 9
AbstractAlthough the movement, due to a temperature gradient, of moisture through porous materials has been studied by many workers, the mechanism by which moisture moves through such materials remains a point of controversy. There are two theories which lead to two generally accepted and possible mechanisms. The first theory postulates that the moisture moves from hot to cold regions in the vapor phase and that the driving potential is the vapor pressure difference which corresponds to the temperature difference.Strong evidence in favor of this mechanism is the absence of moisture movement due to a temperature gradient in a fully saturated system where there is no vapor phase. The second theory postulates that some of the water moves in the liquid phase in the form of a film. This concept was put forward to accountfor the fact that the experimentally observed rate of movement is about ten times as large as the calculated rate based on vapor diffusion.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-47
NRC number4491
1756
NPARC number20377053
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Record identifier2e97a730-4ddb-4b6c-beca-a8e8ad55f992
Record created2012-07-24
Record modified2016-05-09
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