Rectified elongational streaming due to asymmetric electro-osmosis induced by ac polarization

Jie Tang Wu, Jiong Rong Du, Yi-Je Juang, Hsien-Hung Wei

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We demonstrate a microelongational streaming generated by nonlinear electro-osmosis with high-frequency ac polarization. The phenomenon is attributed to the unique rectification mechanism that coordinates three-dimensional flow interactions between adjacent microvortices in an asymmetric quadrupole electric field. This streaming exhibits a stagnation-point structure with velocity of 300 μm/s at 100 Hz due to Faradaic polarization, but is reversed with slower velocity at 1 kHz by Ohmic charging. The measured extensional rate shows a quadratic dependence on the field in line with nonlinear Smoluchowski scale. The flow can be ready to control fluid transport and manipulate particles in microdevices.

Original languageEnglish
Article number134103
JournalApplied Physics Letters
Volume90
Issue number13
DOIs
Publication statusPublished - 2007 Apr 8

Fingerprint

osmosis
three dimensional flow
stagnation point
rectification
polarization
charging
quadrupoles
electric fields
fluids
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Rectified elongational streaming due to asymmetric electro-osmosis induced by ac polarization. / Wu, Jie Tang; Du, Jiong Rong; Juang, Yi-Je; Wei, Hsien-Hung.

In: Applied Physics Letters, Vol. 90, No. 13, 134103, 08.04.2007.

Research output: Contribution to journalArticle

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AB - We demonstrate a microelongational streaming generated by nonlinear electro-osmosis with high-frequency ac polarization. The phenomenon is attributed to the unique rectification mechanism that coordinates three-dimensional flow interactions between adjacent microvortices in an asymmetric quadrupole electric field. This streaming exhibits a stagnation-point structure with velocity of 300 μm/s at 100 Hz due to Faradaic polarization, but is reversed with slower velocity at 1 kHz by Ohmic charging. The measured extensional rate shows a quadratic dependence on the field in line with nonlinear Smoluchowski scale. The flow can be ready to control fluid transport and manipulate particles in microdevices.

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