Resonant mode-hopping micromixing

Ling Sheng Jang, Shih-Hui Chao, Mark R. Holl, Deirdre Meldrum

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A common micromixer design strategy is to generate interleaved flow topologies to enhance diffusion. However, problems with these designs include complicated structures and dead volumes within the flow fields. We present an active micromixer using a resonating piezoceramic/silicon composite diaphragm to generate acoustic streaming flow topologies. Circulation patterns are observed experimentally and correlate to the resonant mode shapes of the diaphragm. The dead volumes in the flow field are eliminated by rapidly switching from one discrete resonant mode to another (i.e., resonant mode-hop). Mixer performance is characterized by mixing buffer with a fluorescence tracer containing fluorescein. Movies of the mixing process are analyzed by converting fluorescent images to two-dimensional fluorescein concentration distributions. The results demonstrate that mode-hopping operation rapidly homogenized chamber contents, circumventing diffusion-isolated zones.

Original languageEnglish (US)
Pages (from-to)179-186
Number of pages8
JournalSensors and Actuators, A: Physical
Volume138
Issue number1
DOIs
StatePublished - Jul 20 2007
Externally publishedYes

Fingerprint

Diaphragms
Fluorescein
Flow fields
Topology
Acoustic streaming
diaphragms
flow distribution
Silicon
topology
acoustic streaming
Buffers
Fluorescence
modal response
tracers
Composite materials
buffers
chambers
fluorescence
composite materials
silicon

Keywords

  • Acoustic streaming
  • Fluorescent image calibration
  • Microfluidics
  • Micromixer
  • Mode-hopping micromixing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

Cite this

Resonant mode-hopping micromixing. / Jang, Ling Sheng; Chao, Shih-Hui; Holl, Mark R.; Meldrum, Deirdre.

In: Sensors and Actuators, A: Physical, Vol. 138, No. 1, 20.07.2007, p. 179-186.

Research output: Contribution to journalArticle

Jang, Ling Sheng ; Chao, Shih-Hui ; Holl, Mark R. ; Meldrum, Deirdre. / Resonant mode-hopping micromixing. In: Sensors and Actuators, A: Physical. 2007 ; Vol. 138, No. 1. pp. 179-186.
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