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AuthorsB.D. Kandhai, D. Hlushkou, A.G. Hoekstra, P.M.A. Sloot, H. van As, U. Tallarek
TitleInfluence of Stagnant Zones on Transient and Asymptotic Dispersion in Macroscopically Homogeneous Porous Media
JournalPhysical Review Letters
Volume88
Year2002
Issue23
Pages1-4
ISSN00319007
FacultyFaculty of Science
Institute/dept.FNWI: Informatics Institute (II)
Keywordsporous materials; flow through porous media; transport processes; mass transfer; diffusion; transients
AbstractThe role of stagnant zones in hydrodynamic dispersion is studied for creeping flow through a fixed bed of spherical permeable particles, covering several orders of characteristic time and length scales associated with fluid transport. Numerical simulations employ a hierarchical model to cope with the different temporal and spatial scales, showing good agreement with our experimental results on diffusion-limited mass transfer, transient, and asymptotic longitudinal dispersion. These data demonstrate that intraparticle liquid holdup in macroscopically homogeneous porous media clearly dominates over contributions caused by the intrinsic flow field heterogeneity and boundary-layer mass transfer.
Document typeArticle
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