DOI: 10.1002/2014GL061475
论文题名: Pore-Scale intermittent velocity structure underpinning anomalous transport through 3-D porousmedia
作者: Kang P.K. ; De Anna P. ; Nunes J.P. ; Bijeljic B. ; Blunt M.J. ; Juanes R.
刊名: Geophysical Research Letters
ISSN: 0094-9824
EISSN: 1944-9555
出版年: 2014
卷: 41, 期: 17 起始页码: 6184
结束页码: 6190
语种: 英语
Scopus关键词: Computerized tomography
; Continuous time systems
; Flow of fluids
; Navier Stokes equations
; Particle separators
; Porous materials
; Random processes
; Velocity
; Anomalous behavior
; Anomalous transport
; Continuous-time random walk models
; Intermittent structures
; Particle transport
; Transport behavior
; Velocity correlations
; Velocity structure
; Transport properties
; fluid flow
; heterogeneity
; numerical model
; porous medium
; three-dimensional modeling
; tomography
; underpinning
; velocity structure
英文摘要: We study the nature of non-Fickian particle transport in 3-D porous media by simulating fluid flow in the intricate pore space of real rock. We solve the full Navier-Stokes equations at the same resolution as the 3-D micro-CT (computed tomography) image of the rock sample and simulate particle transport along the streamlines of the velocity field. We find that transport at the pore scale is markedly anomalous: longitudinal spreading is superdiffusive, while transverse spreading is subdiffusive. We demonstrate that this anomalous behavior originates from the intermittent structure of the velocity field at the pore scale, which in turn emanates from the interplay between velocity heterogeneity and velocity correlation. Finally, we propose a continuous time random walk model that honors this intermittent structure at the pore scale and captures the anomalous 3-D transport behavior at the macroscale. © 2014. American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907942395&doi=10.1002%2f2014GL061475&partnerID=40&md5=47196dbb2126e42dd87e80de1e29c98b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7088
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Kang P.K.,De Anna P.,Nunes J.P.,et al. Pore-Scale intermittent velocity structure underpinning anomalous transport through 3-D porousmedia[J]. Geophysical Research Letters,2014-01-01,41(17).