Abstract
The 3D flow-fields in a staggered and cubic arrangement of mono-radii cylinders are investigated using tomographic-PIV. The cylinder Reynolds-number is in the range of approx 10 to approx 800 giving an almost complete overview of the transition region. Two pore-scale effects are discovered. The first, visible in the cubic packing, is a spatially alternating lateral velocity field, which has a significant impact on the pressure drop and transversal dispersion. The second effect, present in the staggered array, is an example of a disturbance propagation effect that takes place in the laminar steady region; this manifests as a peculiar and complex flow-pattern. In accordance with other studies, it is shown that Darcy’s law can, from an engineering point of view be valid far beyond the limit for Stokesian flow.Graphic abstract
Highlights
Research on porous media has focused on finding simplified models for macroscopic properties including pressure drop, dispersion and, heat transfer
Koch and Ladd (1997), there are four distinct flow regimes of interest when studying porous materials, these are distinguished by different flow properties and are defined in terms of the Reynolds number
A similar porous medium was studied in Sen et al (2012) with PIV yielding 2D low Re velocity fields
Summary
Research on porous media has focused on finding simplified models for macroscopic properties including pressure drop, dispersion and, heat transfer. The development of more advanced measurement and simulation techniques has enabled investigation of the mechanisms leading to these macroscopic properties Examples of such studies are among others (Comiti and Renaud 1989; Khayamyan et al 2017; Koch and Ladd 1997; Koch and Hill 2001) and (Seguin et al 1998). For these type of studies the investigation is focused on how the pore-scale dynamics cause discernible macroscopic properties. Koch and Ladd (1997), there are four distinct flow regimes of interest when studying porous materials, these are distinguished by different flow properties and are defined in terms of the Reynolds number. – Stokes flow: Rez 300
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