dc.identifier.uri |
http://dx.doi.org/10.15488/10713 |
|
dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/10791 |
|
dc.contributor.author |
Hidalgo, Juan J.
|
|
dc.contributor.author |
Neuweiler, Insa
|
|
dc.contributor.author |
Dentz, M.
|
|
dc.date.accessioned |
2021-03-31T06:01:22Z |
|
dc.date.available |
2021-03-31T06:01:22Z |
|
dc.date.issued |
2020 |
|
dc.identifier.citation |
Hidalgo, J.J.; Neuweiler, I.; Dentz, M.: Transport under advective trapping. In: Journal of Fluid Mechanics 907 (2020), A36. DOI: https://doi.org/10.1017/jfm.2020.782 |
|
dc.description.abstract |
Advective trapping occurs when solute enters low velocity zones in heterogeneous porous media. Classical local modelling approaches combine the impact of slow advection and diffusion into a hydrodynamic dispersion coefficient and many temporally non-local approaches lump these mechanisms into a single memory function. This joint treatment makes parameterization difficult and thus prediction of large-scale transport a challenge. Here, we investigate the mechanisms of advective trapping and their impact on transport in media composed of a high conductivity background and isolated low permeability inclusions. Breakthrough curves show that effective transport changes from a streamtube-like behaviour to genuine random trapping as the degree of disorder of the inclusion arrangement increases. We upscale this behaviour using a Lagrangian view point, in which idealized solute particles transition over a fixed distance at random advection times combined with Poissonian advective trapping events. We discuss the mathematical formulation of the upscaled model in the continuous time random walk and mobile-immobile mass transfer frameworks, and derive a model for large-scale solute non-Fickian dispersion. These findings give new insight into transport in highly heterogeneous media. © 2020 BMJ Publishing Group. All rights reserved. |
eng |
dc.language.iso |
eng |
|
dc.publisher |
Cambridge [u.a.] : Cambridge University Press |
|
dc.relation.ispartofseries |
Journal of Fluid Mechanics 907 (2020) |
|
dc.rights |
CC BY 4.0 Unported |
|
dc.rights.uri |
https://creativecommons.org/licenses/by/4.0/ |
|
dc.subject |
mixing and dispersion |
eng |
dc.subject |
porous media |
eng |
dc.subject.ddc |
530 | Physik
|
ger |
dc.title |
Transport under advective trapping |
|
dc.type |
Article |
|
dc.type |
Text |
|
dc.relation.essn |
1469-7645 |
|
dc.relation.issn |
0022-1120 |
|
dc.relation.doi |
https://doi.org/10.1017/jfm.2020.782 |
|
dc.bibliographicCitation.volume |
907 |
|
dc.bibliographicCitation.firstPage |
A36 |
|
dc.description.version |
publishedVersion |
|
tib.accessRights |
frei zug�nglich |
|