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Solute dispersion in rock fractures by Non‐Darcian Flow
Author(s) -
Yeo In Wook,
Ge Shemin
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013274
Subject(s) - dispersion (optics) , péclet number , diffusion , taylor dispersion , flow (mathematics) , molecular diffusion , thermodynamics , mechanics , materials science , mineralogy , geology , physics , optics , metric (unit) , operations management , economics
This study aims at investigating the relationship between the ratio of dispersion coefficient to molecular diffusion coefficient ( D L /D m ) and Peclet number ( Pe ) for a multi‐solute system in non‐Darcian flow regimes. Existing understanding on solute dispersion is primarily derived from Darcian flow regime with one solute. We find that solute dispersion in rock fractures can be characterized by the mechanism of both macrodispersion and Taylor dispersion, in non‐Darcian flow domains. For the Darcian flow regime, different solutes lead to the same D L /D m ‐ Pe relationship. However, as the flow becomes non‐Darcian, solute with a higher molecular diffusion coefficient result in higher D L /D m at the same Pe than that with a lower diffusion coefficient.