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Updated: Dec 18, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
The checkerboard model for the Eddy-dispersion in Laminar flows through porous media. Part II: Application to ordered
Gert Desmet1, Wim Smits1, Sander Deridder1
1Vrije Universiteit Brussel, Department of Chemical Engineering, Pleinlaan 2, 1050 Brussels, Belgium.
Abstract:
We report on a series of high-accuracy computational fluid dynamics band broadening simulations in three different 2-D flow systems: a 2-D pillar array and 2-D lumped packed bed geometries with different checkerboard velocity bias patterns. These media display a local maximum in the relationship between the eddy-dispersion plate height and the mobile phase velocity. The occurrence of such a dispersion maximum has not been reported before but appears to be a characteristic of regular chromatographic media with alternating velocity bias, at least in 2-D geometries. This newly observed behavior can be fully understood and modelled using the checkerboard model established in part I of the present study.
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