Electroosmotic flow driven by DC and AC electric fields in curved microchannels

Jia Kun Chen, Win Jet Luo, Ruey Jen Yang

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The purpose of this study is to investigate electroosmotic flows driven by externally applied DC and AC electric fields in curved microchannels. For the DC electric driving field, the velocity distribution and secondary flow patterns are investigated in microchannels with various curvature ratios. We use the Dean number to describe the curvature effect of the flow field in DC electric field. The result implies that the effect of curvatures and the strength of the secondary flows become get stronger when the curvature ratio of C/A (where C is the radius of curvature of the microchannel and A is the half-height of rectangular curved tube.) is smaller. For the AC electric field, the velocity distribution and secondary flow patterns are investigated for driving frequencies in the range of 2.0kHz (Wo = 0.71) to 11 kHz (Wo = 1.66). The numerical results reveal that the velocity at the center of the microchannel becomes lower at higher frequencies of the AC electric field and the strength of the secondary flow decreases. When the applied frequency exceeds 3.0kHz (Wo = 0.87), vortices are no longer observed at the corners of the microchannel. Therefore, it can be concluded that the secondary flow induced at higher AC electric field frequencies has virtually no effect on the axial flow field in the microchannel.

Original languageEnglish
Pages (from-to)7983-7990
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number10 A
DOIs
Publication statusPublished - 2006 Oct 15

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Electroosmotic flow driven by DC and AC electric fields in curved microchannels'. Together they form a unique fingerprint.

Cite this