年次大会
Online ISSN : 2424-2667
ISSN-L : 2424-2667
セッションID: S052-01
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単純せん断流中における強磁性棒状粒子の凝集構造に及ぼす粒子のアスペクト比の影響
(ブラウン動力学シミュレーション)
*佐藤 完紀岡田 和也
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Magnetic particles exposed to a uniform external magnetic field tend to aggregate to form chain-like clusters along the direction of the magnetic field. This formation of chain-like clusters provides resistance to the flow field, which increases the apparent viscosity of the dispersion. This phenomenon is called the magnetorheological effect and magnetically-controlled fluid devises are typical application that are developed by exploiting this effect in the field of fluid engineering. In the present study, we have treated a dispersion composed of ferromagnetic rod-like particles in a simple shear flow to investigate the effect of the particle aspect ratio on the internal structure of aggregates by using Brownian dynamics simulations. The results obtained here are summarized as follows. In the absence of an applied magnetic field, rod-like particles with low aspect ratio aggregate to form stable packed clusters with an increase in the strength of the magnetic particle-particle interaction. On the other hand, rod-like particles with high aspect ratio aggregate to form unstable raft-like clusters. That is, the internal structure of particle aggregates is dramatically changed for change in the particle aspect ratio.

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