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Three regimes of inertial focusing for spherical particles suspended in circular tube flows

Published online by Cambridge University Press:  30 May 2019

Saki Nakayama ,
Hiroshi Yamashita ,
Takuya Yabu ,
Tomoaki Itano  and
Masako Sugihara-Seki Open the ORCID record for Masako Sugihara-Seki [Opens in a new window]
Saki Nakayama
Affiliation:
Kansai University, Department of Pure and Applied Physics, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
Hiroshi Yamashita
Affiliation:
Kansai University, Department of Pure and Applied Physics, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
Takuya Yabu
Affiliation:
Kansai University, Department of Pure and Applied Physics, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
Tomoaki Itano
Affiliation:
Kansai University, Department of Pure and Applied Physics, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
Masako Sugihara-Seki*
Affiliation:
Kansai University, Department of Pure and Applied Physics, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan Osaka University, Graduate School of Engineering Science, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
*
†Email address for correspondence: sekim@kansai-u.ac.jp
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Abstract

An experimental and numerical study on the inertial focusing of neutrally buoyant spherical particles suspended in laminar circular tube flows was performed at Reynolds numbers ($Re$) ranging from 100 to 1000 for particle-to-tube diameter ratios of ${\sim}0.1$. In the experiments, we measured the cross-sectional distribution of particles in dilute suspensions flowing through circular tubes several hundreds of micrometres in diameter. In the cross-section located at 1000 times the tube diameter from the tube inlet, all particles were highly concentrated on one annulus or two annuli, depending on $Re$. At low $Re$, the particles were focused on the so-called Segré–Silberberg (SS) annulus, in accordance with previous studies (regime (A)). At higher $Re$, two particle focusing annuli appeared, with the outer annulus corresponding to the SS annulus (regime (B)). We call the annulus closer to the tube centre ‘the inner annulus’, although this term was used by Matas et al. (J. Fluid Mech., vol. 515, 2004, pp. 171–195) for a significantly broader annulus which included the transient accumulation of particles observed in regime (A). At even higher $Re$, particles were focused on the inner annulus (regime (C)), indicating that the radial position of the SS annulus is no longer a stable equilibrium position. These experimental results were confirmed by a numerical simulation based on the immersed boundary method. The results of this study also indicate that the critical Reynolds numbers between two neighbouring regimes decrease with the increase of the particle-to-tube diameter ratio.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 871 , 25 July 2019 , pp. 952 - 969
Copyright
© 2019 Cambridge University Press 

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