Control of non-spherical microparticles with center of gravity offset by a shear flow

Fumihiko Mikami, Kazuo Tanishita

Research output: Contribution to journalArticle


The dynamics of sedimenting non-spherical particles with center of gravity offset in a shear flow is analyzed numerically using a dumbbell model. The calculation is performed by the method based on the Stokesian dynamics which accounts for multiple-body hydrodynamic interparticle interactions based on the Stokes equation. A dumbbell is found to rotate or glide, depending on the center of gravity offset ε and the strength of the shear flow. In the rotating motion, the particle rotates and falls vertically, accompanied by a periodical horizontal drift. In the gliding motion, the particle orients and glides in a fluid, where the gliding angle is determined by ε. The difference in trajectories of a dumbbell according to ε indicates that the motion of non-spherical particles with center of gravity offset can be controlled by a shear flow. A computation is performed for a mixture of two kinds of dumbbells, i.e., ε = 0 and 0.5, falling in a shear flow, and these dumbbells are sorted into two groups according to ε.

Original languageEnglish
Pages (from-to)1685-1692
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number585
Publication statusPublished - 1995 May


ASJC Scopus subject areas

  • Mechanical Engineering

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