Home > Publications database > Three-dimensional imaging of pore water diffusion and motion in porous media by nuclear magnetic resonance imaging > print

001     9061
005     20180208204055.0
024 7 _ |2 DOI
|a 10.1016/S0022-1694(02)00154-3
024 7 _ |2 WOS
|a WOS:000178504900010
037 _ _ |a PreJuSER-9061
041 _ _ |a eng
082 _ _ |a 690
084 _ _ |2 WoS
|a Engineering, Civil
084 _ _ |2 WoS
|a Geosciences, Multidisciplinary
084 _ _ |2 WoS
|a Water Resources
100 1 _ |a Herrmann, K. H.
|b 0
|u FZJ
|0 P:(DE-Juel1)VDB6975
245 _ _ |a Three-dimensional imaging of pore water diffusion and motion in porous media by nuclear magnetic resonance imaging
260 _ _ |a Amsterdam [u.a.]
|b Elsevier
|c 2002
300 _ _ |a 244 - 257
336 7 _ |a Journal Article
|0 PUB:(DE-HGF)16
|2 PUB:(DE-HGF)
336 7 _ |a Output Types/Journal article
|2 DataCite
336 7 _ |a Journal Article
|0 0
|2 EndNote
336 7 _ |a ARTICLE
|2 BibTeX
336 7 _ |a JOURNAL_ARTICLE
|2 ORCID
336 7 _ |a article
|2 DRIVER
440 _ 0 |a Journal of Hydrology
|x 0022-1694
|0 3413
|v 267
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a We report on the use of a pulsed gradient spin-echo imaging sequence for the three-dimensional (3D) imaging of water transport properties in two porous media: 2 mm glass-beads and 0.15 turn quartz-sand mixed with 2 turn glass-beads. In contrast to tracer methods, which monitor the tracer motion by its effect on the signal relaxation of H-1, this sequence measures the echo signal intensity I-0 without and I with applied diffusion gradient, respectively. For the wide-pore glass-bead system, the intensity loss is controlled by nearly free self-diffusion in the pores. A mean apparent diffusion coefficient is calculated from the ratio ln(I-0/I) as = 1.9 x 10(-9) m(2) s(-1), which is slightly lower than that of free water (D = 2.3 x 10(-9) m(2) s(-1)). Increasing the mean pore flow velocity from 0 to 0.14 mm s(-1) results in a linear increase of to 2.3 x 10(-9) m(2) s(-1), caused by mechanical dispersion. The spatial distribution is of the log-normal type, where the width increases with increasing pore velocity. Correlation lengths are also calculated.For the fine porous medium, frequent contacts of the water molecules with the pore boundaries lead to a significant decrease of I-0 by increased T-2 relaxation. The resulting ratio of the signal intensities ln(I-0/I) is then smaller than expected for pure diffusion, which is caused by the restricted diffusion in the fine pore system. The spatial distribution (normal) is broader than for the glass-bead system and the mean local apparent diffusion coefficient is calculated as 1 x 10(-9) m(2) s(-1), a dependence on the pore flow velocity could not be detected.For the glass-bead system, the 3D image clearly shows regions of increased dispersivity (50% greater than the D-loc), caused by packing errors, leading to preferential flow. This macroscopic effect on the column scale is quantified by a numerical simulation of tracer transport, based on the 3D diffusion coefficient field, assuming a linear relation to local velocities. From this simulation, the effective dispersion coefficient is obtained for the column scale (D-eff = 130 x 10(-9) m(2) s(-1)), which is comparable to that obtained from classical break-through curves with tracer substances. (C) 2002 Published by Elsevier Science B.V.
536 _ _ |a Biotechnologie
|c L02
|2 G:(DE-HGF)
|0 G:(DE-Juel1)FUEK256
|x 0
588 _ _ |a Dataset connected to Web of Science
650 _ 7 |a J
|2 WoSType
653 2 0 |2 Author
|a magnetic resonance imaging
653 2 0 |2 Author
|a porous media
653 2 0 |2 Author
|a velocity distribution
653 2 0 |2 Author
|a correlation length
653 2 0 |2 Author
|a diffusion coefficient
653 2 0 |2 Author
|a dispersion
700 1 _ |a Pohlmeier, A.
|b 1
|u FZJ
|0 P:(DE-Juel1)VDB1270
700 1 _ |a Gembris, D.
|b 2
|u FZJ
|0 P:(DE-Juel1)VDB449
700 1 _ |a Vereecken, H.
|b 3
|u FZJ
|0 P:(DE-Juel1)129549
773 _ _ |a 10.1016/S0022-1694(02)00154-3
|g Vol. 267, p. 244 - 257
|p 244 - 257
|q 267<244 - 257
|0 PERI:(DE-600)1473173-3
|t Journal of hydrology
|v 267
|y 2002
|x 0022-1694
909 C O |o oai:juser.fz-juelich.de:9061
|p VDB
913 1 _ |k L02
|v Biotechnologie
|l Biotechnologie
|b Leben
|0 G:(DE-Juel1)FUEK256
|x 0
914 1 _ |y 2002
915 _ _ |0 StatID:(DE-HGF)0010
|a JCR/ISI refereed
920 1 _ |k IME
|l Institut für Medizin
|d 31.12.2006
|g IME
|0 I:(DE-Juel1)VDB54
|x 0
920 1 _ |k ICG-IV
|l Agrosphäre
|d 31.12.2006
|g ICG
|0 I:(DE-Juel1)VDB50
|x 1
970 _ _ |a VDB:(DE-Juel1)11845
980 _ _ |a VDB
980 _ _ |a ConvertedRecord
980 _ _ |a journal
980 _ _ |a I:(DE-Juel1)INB-3-20090406
980 _ _ |a I:(DE-Juel1)IBG-3-20101118
980 _ _ |a UNRESTRICTED
981 _ _ |a I:(DE-Juel1)INB-3-20090406
981 _ _ |a I:(DE-Juel1)IBG-3-20101118

LibraryCollectionCLSMajorCLSMinorLanguageAuthor
Marc 21