Chaotic mixing in a microchannel utilizing periodically switching electro-osmotic recirculating rolls

Chih Chang Chang, Ruey Jen Yang

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

In this study, active mixing in a microchannel with spatiotemporal variations in ζ potential distributions was investigated theoretically. In this mixing system, the primary flow is a pressure-driven flow (i.e., parabolic flow), and the electro-osmotic recirculating rolls induced by the heterogeneous ζ potential distributions act as the perturbation source. By timewise alterations of two different electro-osmotic recirculating flow fields, chaotic mixing can be induced. Blob deformation, Poincaré map, and Lyapunov exponent analyses were employed to describe the behaviors of the particle motion in this active mixing system. Finally, the optimal time-switching period was identified, which was also verified through direct numerical simulations.

Original languageEnglish
Article number056311
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume77
Issue number5
DOIs
Publication statusPublished - 2008 May 22

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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