Crystallization and intermittent dynamics in constricted microfluidic flows of dense suspensions

D. Genovese, J.H.B. Sprakel

Research output: Contribution to journalArticleAcademicpeer-review

35 Citations (Scopus)

Abstract

A strong coupling between shear, confinement and microstructure governs the flow of dense colloidal suspensions through narrow channels. In this paper we explore the additional complexity that arises when the channel is partially blocked by a constriction in the centre of the channel. The reduction of the particle flux due to the constriction induces a densification upstream from the constriction, resulting in the formation of extended crystalline domains. A dynamic equilibrium establishes, which is characterized by large fluctuations in the instantaneous flow velocity and the local density. In some cases, the individual events leading to this intermittent behaviour are clearly visible as transient and localized jamming and unjamming events.
Original languageEnglish
Pages (from-to)3889-3896
JournalSoft Matter
Volume7
Issue number8
DOIs
Publication statusPublished - 2011

Keywords

  • shear-induced order
  • microchannels
  • transition

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