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Scale-independent model of gravitational settling of particulate suspension in a fractal channel

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Title: Scale-independent model of gravitational settling of particulate suspension in a fractal channel
Authors: Kurose, Yudai Browse this author
Ishizawa, Kanami Browse this author
Soriano, Ma Rebecca Browse this author
Harada, Shusaku Browse this author →KAKEN DB
Keywords: Particulate suspension
Gravitational settling
Complex channel
Fractal characteristics
Issue Date: 18-May-2019
Publisher: Elsevier
Journal Title: Chemical Engineering Science
Volume: 199
Start Page: 231
End Page: 239
Publisher DOI: 10.1016/j.ces.2018.12.049
Abstract: Gravitational settling of solid particles into a fractal-shaped channel was investigated experimentally and theoretically. Previous studies have reported that the settling behavior of particles in liquid-filled channels depends strongly on particle properties and suspension conditions. At small particle size and high concentration, particles settle collectively like an immiscible fluid with respect to the surrounding one. In this study, we examined the gravitational dispersion behavior of solid particles in a three-dimensional fractal-shaped channel under various collective conditions. The experimental results showed that the settling behavior varies with the collectivity of suspended particles. In the case of high collectivity conditions, settling velocity is enhanced by a density-driven instability, which depends not only on the physical properties of the particles and fluid but also on channel geometry. We developed a model of temporal change in the volumetric occupancy ratio of the suspended particles region. This model describes the invasion of particles into a fractal channel. Our model comprises only the fractal characteristics of the channel, such as a homothetic ratio and a bifurcation number. Consequently, This model could provide a rough prediction of the gravity-induced invasion behavior of particles into any fractal-shaped channel.
Rights: ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
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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