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Hydrodynamic diffusive behavior of fine particle assemblage passing through nonuniform granular porous media

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Title: Hydrodynamic diffusive behavior of fine particle assemblage passing through nonuniform granular porous media
Authors: Otomo, Ryoko Browse this author
Nakano, Yuki Browse this author
Harada, Shusaku Browse this author →KAKEN DB
Keywords: Fine particles
hydrodynamic diffusion
granular porous media
nonuniform structure
stokes flow
micro-scale transport
Issue Date: 2023
Publisher: Taylor & Francis
Journal Title: Particulate Science and Technology
Volume: 41
Issue: 7
Start Page: 940
End Page: 952
Publisher DOI: 10.1080/02726351.2022.2163442
Abstract: We numerically investigated how fine particle assemblages move through pore space of granular media filled with fluid on the assumption of extremely small Reynolds number and Stokes number. We calculated the particle trajectories passing through granular bed with uniform and nonuniform structures by the Stokesian dynamics method, which can take into account hydrodynamic interactions between particles. It was observed that the particle assemblage was moving complexly while avoiding granular bed, resulting in hydrodynamic diffusion. The hydrodynamic diffusive behavior in the traveling and lateral directions was evaluated using the index D-h, which means the particles dispersion increases per unit time. By comparison with the uniform granular bed, it was found that the hydrodynamically-diffusive behavior in the nonuniform bed was quite distinctive. Particularly, in the lateral direction, the particle assemblages showed both positive and negative spreading depending on the non-uniformity. The present results indicate that the relationship between a nonuniform structure and the index D-h could be applied to various engineering processes such as separating and sorting fine particles.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Particulate Science and Technology on 2023, available online:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 原田 周作

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