Article (Scientific journals)
On Water Transfer and Hydraulic Connection Layer During the Convective Drying of Rigid Porous Material
Prime, Noémie; Housni, Z; Fraikin, Laurent et al.
2015In Transport in Porous Media, 106 (1), p. 47-72
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Keywords :
Convective drying; Hydraulic connection layer; Hydro-thermal coupling; Rock; Water transfer; Hydraulic connection
Abstract :
[en] The convective drying of a natural porous material, limestone, is investigated in this study, with both experimental and numerical approaches. The first experimental campaign, which focuses on the influence of samples’ slenderness, suggests the presence of a hydraulic connection layer between the porous water and the external environment, in spite of the very fine pore structure of the material. This hydraulic transfer enables the fast water evaporation at the beginning of the drying test, when external conditions drive the kinetics. Furthermore, the results show that this layer does not exceed 30 mm deep from the external surface, given the drying conditions of the test. A second experimental campaign aims to analyse, by mean of an X-ray tomography tool, the internal water content during the drying. It confirms that water transfer takes place within the limestone in two distinct stages. The first stage being faster than the second one with a homogeneous desaturation along the sample, it is consistent with the hypothesis of the hydraulic connection layer. Finally, the finite element modelling makes possible to identify the main mechanisms of water transfer, namely liquid convection and vapour diffusion. © 2014, Springer Science+Business Media Dordrecht
Disciplines :
Chemical engineering
Author, co-author :
Prime, Noémie;  Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologique de l'ingénieur
Housni, Z
Fraikin, Laurent ;  Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Léonard, Angélique  ;  Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Charlier, Robert ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Levasseur, Séverine 
Language :
English
Title :
On Water Transfer and Hydraulic Connection Layer During the Convective Drying of Rigid Porous Material
Publication date :
2015
Journal title :
Transport in Porous Media
ISSN :
0169-3913
eISSN :
1573-1634
Publisher :
Kluwer Academic Publishers
Volume :
106
Issue :
1
Pages :
47-72
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 29 June 2015

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