Reorientation of a nonspherical capsule in creeping shear flow

Toshihiro Omori, Yohsuke Imai, Takami Yamaguchi, Takuji Ishikawa

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


The dynamics of a capsule and a biological cell is of great interest in chemical engineering and bioengineering. Although the dynamics of a rigid spheroid is well understood by Jeffery's theory, that of a spheroidal capsule remains unclear. In this Letter, the motion of a spheroidal capsule or a red blood cell in creeping shear flow is investigated. The results show that the orientation of a nonspherical capsule is variant under time reversal, though that of a rigid spheroid is invariant. Surprisingly, the alignment of a nonspherical capsule over a long time duration shows a transition depending on the shear rate, which can be utilized for a particle-alignment technique. These findings form a fundamental basis of the suspension mechanics of capsules and biological cells.

Original languageEnglish
Article number138102
JournalPhysical review letters
Issue number13
Publication statusPublished - 2012 Mar 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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