期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.184502
关键词
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资金
- European Commission through FP7 ITN project IMVUL [212298]
- Marie Curie ERG grant ReactiveFlows [230947]
- ASCR Office of the U.S. Department of Energy
- NSF [EAR-1113704]
- FP7 EU project PANACEA [282900]
- Division Of Earth Sciences
- Directorate For Geosciences [1113704] Funding Source: National Science Foundation
We study the intermittency of fluid velocities in porous media and its relation to anomalous dispersion. Lagrangian velocities measured at equidistant points along streamlines are shown to form a spatial Markov process. As a consequence of this remarkable property, the dispersion of fluid particles can be described by a continuous time random walk with correlated temporal increments. This new dynamical picture of intermittency provides a direct link between the microscale flow, its intermittent properties, and non-Fickian dispersion.
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