Influence of Stagnant Zones on Transient and Asymptotic Dispersion in Macroscopically Homogeneous Porous Media

作     者：D. Kandhai D. Hlushkou A. G. Hoekstra P. M. A. Sloot H. Van As U. Tallarek 

作者机构：Section Computational Science Faculty of Science University of Amsterdam Kruislaan 403 1098 SJ Amsterdam The Netherlands Kramers Laboratorium voor Fysische Technologie Faculty of Applied Sciences Delft University of Technology Prins Bernhardlaan 6 2628 BW Delft The Netherlands Max Planck Institute for the Dynamics of Complex Technical Systems Sandtorstrasse 1 39106 Magdeburg Germany Department of System Analysis Belarusian State University 4 Francisk Scoryna Avenue Minsk 220050 Belarus Laboratory of Molecular Physics and Wageningen NMR Centre Wageningen University Dreijenlaan 3 6703 HA Wageningen The Netherlands Lehrstuhl für Chemische Verfahrenstechnik Otto-von-Guericke Universität Magdeburg Universitätsplatz 2 39106 Magdeburg Germany 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2002年第88卷第23期

页      面：234501-234501页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Porous materials 

摘      要：The 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.