作者
Drona Kandhai, Dzmitry Hlushkou, Alfons G Hoekstra, Peter MA Sloot, H Van As, U Tallarek
发表日期
2002/5/24
期刊
Physical review letters
卷号
88
期号
23
页码范围
234501
出版商
American Physical Society
简介
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.
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